### General Information about the tool

This on-line interactive tool is designed to provide individual and across field summaries of on-farm trials
conducted by farmers working with the Iowa Soybean Association.

On-farm trials include replicated treatments or strips that test different products, practices or technologies in Iowa cropping systems.

Farmers apply treatments and collect yield observations using yield monitoring equipment and GPS.

All the trials used have two treatments: treated and control.

On-farm trials include replicated treatments or strips that test different products, practices or technologies in Iowa cropping systems.

Farmers apply treatments and collect yield observations using yield monitoring equipment and GPS.

All the trials used have two treatments: treated and control.

### Process

Yield and as applied spatial data of the studied fields were cleaned of errors and outliers guided by aerial
imagery and information from farmer equipment such as combine speed, grain moisture, harvest date and
field scouting. Treatment averages were combined with weather observations from the Iowa Environmental Mesonet,
field management, digital soil information, and scouting data.

### Data analyses

The effect of treatments is shown as average yield differences (bu/acre) or yield change (%) for individual trials and across trials in different years. Uncertainty in averages is shown by 80, 90 and 95% confidence intervals.
The treatment effects are meaningful if the confidence intervals for the averages do not cross the zero-yield response line.
Yield differences are correlated with observed rainfall, growing degree days and yield level of the control or control strips.

### How to use the tool

Navigate through Tabs on the left to select a crop and trial category of interest.
Read the trial description, check trial locations, observed weather and view results.
You can select or deselect years by checking boxes on the legend. You can hover to see data values on the plot. Scroll under each graph to view more information or explanation. General conclusions for each trial type follow the graphic information.

### Contact

For any information, or to report a technical issue, please send an email to Anabelle Laurent alaurent@iastate.edu or Fernando Miguez femiguez@iastate.edu or Peter Kyveryga @ pkyveryga@iasoybeans.com

### What was done

Rationale

Cyst Nematode (SCN) is a plant parasitic nematode that can cause significant yield loss in soybean. The primary management of SCN is using resistant soybean varieties. In recent years, nematicide seed treatments have become available to control and manage SCN.

The objective of this study was to evaluate the Clariva Complete Beans biological seed treatment for its effectiveness in reducing SCN reproduction and increasing soybean yield across diverse soil and weather conditions in Iowa.

The Clariva seed treatments were compared to a control, Cruiser Maxx Advanced plus Vibrance, which was a background for both treatments.

Cyst Nematode (SCN) is a plant parasitic nematode that can cause significant yield loss in soybean. The primary management of SCN is using resistant soybean varieties. In recent years, nematicide seed treatments have become available to control and manage SCN.

The objective of this study was to evaluate the Clariva Complete Beans biological seed treatment for its effectiveness in reducing SCN reproduction and increasing soybean yield across diverse soil and weather conditions in Iowa.

The Clariva seed treatments were compared to a control, Cruiser Maxx Advanced plus Vibrance, which was a background for both treatments.

### Trial Locations

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### Information

The map of Iowa shows county lines (black) and landform regions (gray): Northwest Plains,
Des Moines Lobe, and Iowan Surface, from west to east across the northern half
of the state, and Southern Iowa Drift Plain across the southern half of the state.

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### Information

The reference rainfall (indicated by the gray bar) represents the mean monthly rainfall from 2014 to 2016 in Iowa. Source: Iowa Mesonet

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### Growing Degree Days Information

Growing degree days (GDD) is a measure of heat accumulation
used to predict plant and pest development rates.

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### Yield Difference (bu/acre) / Yield Change (%)

Yield difference is the yield of the treated replications minus the yield of the paired control replications.
The stars represent average yield differences for individual trials (bu/acre). Each dot represents one replicate within a trial.

Yield change is the percentage of yield gain (if positive) or yield loss (if negative) using the treatment. The stars represent average yield changes for individual trials (%). Each dot represents one replicate within a trial.

Yield change is the percentage of yield gain (if positive) or yield loss (if negative) using the treatment. The stars represent average yield changes for individual trials (%). Each dot represents one replicate within a trial.

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### Information

Yield difference is the yield of Clariva minus the yield of the control.
One dot represents one replicate within a trial. The yield differences are grouped by soil texture.
The boxplot indicates the range of the yield differences. The box plot from bottom to top includes:
the lower whisker, 5th percentile; the bottom of the box, 25th percentile; the median yield difference (horizontal line within the box);
the top of the box, 75th percentile; and the upper whisker, 95th percentile.

Yield change is the percentage of yield gain (if positive) or yield loss (if negative) using Clariva vs the control. One dot represents one replicate within a trial. The yield differences are grouped by soil texture. The boxplot indicates the range of the yield change (%). The box plot from bottom to top includes: the lower whisker, 5th percentile; the bottom of the box, 25th percentile; the median % yield change, (the horizontal line within the box); the top of the box, 75th percentile; and the upper whisker, 95th percentile.

Yield change is the percentage of yield gain (if positive) or yield loss (if negative) using Clariva vs the control. One dot represents one replicate within a trial. The yield differences are grouped by soil texture. The boxplot indicates the range of the yield change (%). The box plot from bottom to top includes: the lower whisker, 5th percentile; the bottom of the box, 25th percentile; the median % yield change, (the horizontal line within the box); the top of the box, 75th percentile; and the upper whisker, 95th percentile.

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### Information

Yield difference is the yield of Clariva minus the yield of the control.
One dot represents one replicate within a trial. The yield differences are grouped by soil texture.
The boxplot indicates the range of the yield differences. The box plot from bottom to top includes:
the lower whisker, 5th percentile; the bottom of the box, 25th percentile; the median yield difference (horizontal line within the box);
the top of the box, 75th percentile; and the upper whisker, 95th percentile.

Yield change is the percentage of yield gain (if positive) or yield loss (if negative) using Clariva vs the control. One dot represents one replicate within a trial. The yield differences are grouped by soil texture. The boxplot indicates the range of the yield change (%). The box plot from bottom to top includes: the lower whisker, 5th percentile; the bottom of the box, 25th percentile; the median % yield change, (the horizontal line within the box); the top of the box, 75th percentile; and the upper whisker, 95th percentile.

Yield change is the percentage of yield gain (if positive) or yield loss (if negative) using Clariva vs the control. One dot represents one replicate within a trial. The yield differences are grouped by soil texture. The boxplot indicates the range of the yield change (%). The box plot from bottom to top includes: the lower whisker, 5th percentile; the bottom of the box, 25th percentile; the median % yield change, (the horizontal line within the box); the top of the box, 75th percentile; and the upper whisker, 95th percentile.

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### Break-Even Analysis

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### Yield Change Results

Across all trials, Clariva nematicide treatments produced a yield change
of 0.6% with a 90% confidence interval from -0.4 to 1.6%.

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### Information

This graph shows the relationship between the Yield at the control and the mean yield response to Clariva
for individual trials.

The flatter the smoother line, the weaker the relationship. Outliers aside, the slightly downward sloping line for 32 trials would indicate that Clariva had a slightly more positive effect in lower yielding or more highly stressed fields.

The flatter the smoother line, the weaker the relationship. Outliers aside, the slightly downward sloping line for 32 trials would indicate that Clariva had a slightly more positive effect in lower yielding or more highly stressed fields.

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### Information

This graph shows the relationship between yield response and rainfall (inches) in individual trials.

The flatter the smoother line, the weaker the relationship. Rainfall had little effect on Clariva performance.

The flatter the smoother line, the weaker the relationship. Rainfall had little effect on Clariva performance.

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### Information

This graph shows the relationship between yield response and cumulative GDD (F) across trials for different years.

The flatter the smoother line, the weaker the relationship. GDD had no effect on Clariva performance.

The flatter the smoother line, the weaker the relationship. GDD had no effect on Clariva performance.

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### Information

Soybean SCN eggs counts are plotted for Clariva and Control treatments for spring (green)
and fall (orange) samplings. When hovering on the graph, each bar will show a
Reproductive Factor- a ratio of egg counts for fall relative to spring sampling.
A reproductive factor >1 indicates increase nematode pressure by harvest
and a reproductive factor of <1 indicates decrease in nematode pressure by harvest.

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### Key result

Clariva treatments slightly decreased SCN reproductive factors in some trials,
and the reproductive values tended to decrease with an increase of trial
Cumulative GDD

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### Key Results

The Clariva Treatments slightly lowered SCN reproductive factors and
reproductive factor values tended to decrease with higher GDD.

### Conclusions

- Of the 32 trials in 2014, 2015 and 2016, only 3 trials had significant positive yield responses of 1.2, 1.4 and 2.2 bu/acre on soybean.
- Across three years with a 90% confidence interval, Clariva nematocide treatments increased yield on average by 0.4 bu/acre, from -0.1 to 0.8 bu/acre.
- There was no significant difference in egg counts between the spring counts and the fall.
- Only three trials had CSN counts larger than 1,000 eggs/100 grams of soil
- Clariva slightly decreased SCN egg counts in a few trials.

### What was done

Rationale
Sudden death syndrome (SDS) is caused by the fungus Fusarium virguliforme resulting in significant soybean yield loss. Another yield reducing pest is soybean cyst nematodes (Heterodera glycines).
The objective of this on-farm study was to evaluate the efficacy of the seed treatment ILeVO (fluopyram) to control SDS and soybean cyst nematode (SCN) and the effect of these pests on yield soybean yield across diverse soil and weather conditions in Iowa.
Fifteen two-treatment on-farm replicated strip trials were conducted in 2015. The two treatments had a base fungicide and insecticide seed treatment with and without ILeVO. Soil sampling for SCN was conducted in the spring and fall, SDS severity ratings were taken in early September. Georeferenced yield data were collected by farmers' combines equipped with GPS.

### Trial Locations

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### Information

The map of Iowa shows county lines (black) and landform regions (gray) to clarify trial locations
and general topographical attributes. The bulk of Iowa’s landmass falls primarily into 4 regions:
Northwest Plains, Des Moines Lobe, and Iowan Surface, from west to east across the northern half of
the state, and Southern Iowa Drift Plain across the southern half of the state.

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### Monthly Rainfall Information

The reference rainfall (indicated by the gray bars) represents the mean
monthly rainfall for Years 2015-2016 in Iowa. Source: Iowa Mesonet

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### Growing Degree Days Information

Growing degree days (GDD) is a measure of heat accumulation used to
predict plant and pest development rates, including crop maturity.

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### Information

Yield difference is the yield of the treated replications minus the yield of the paired control replications.
The stars represent average yield differences for individual trials (bu/acre). Each dot represents one replicate within a trial.

Yield change is the percentage of yield gain (if positive) or yield loss (if negative) using the treatment. The stars represent average yield changes for individual trials (%). Each dot represents one replicate within a trial.

Yield change is the percentage of yield gain (if positive) or yield loss (if negative) using the treatment. The stars represent average yield changes for individual trials (%). Each dot represents one replicate within a trial.

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### Information

Yield difference is the yield of ILeVO minus the yield of the control.
One dot represents one replicate within a trial. The yield differences are grouped by soil texture.
The boxplot indicates the range of the yield differences. The box plot from bottom to top includes:
the lower whisker, 5th percentile; the bottom of the box, 25th percentile; the median yield difference (horizontal line within the box);
the top of the box, 75th percentile; and the upper whisker, 95th percentile.

Yield change is the percentage of yield gain (if positive) or yield loss (if negative) using ILeVO vs the control. One dot represents one replicate within a trial. The yield differences are grouped by soil texture. The boxplot indicates the range of the yield change (%). The box plot from bottom to top includes: the lower whisker, 5th percentile; the bottom of the box, 25th percentile; the median % yield change, (the horizontal line within the box); the top of the box, 75th percentile; and the upper whisker, 95th percentile.

Yield change is the percentage of yield gain (if positive) or yield loss (if negative) using ILeVO vs the control. One dot represents one replicate within a trial. The yield differences are grouped by soil texture. The boxplot indicates the range of the yield change (%). The box plot from bottom to top includes: the lower whisker, 5th percentile; the bottom of the box, 25th percentile; the median % yield change, (the horizontal line within the box); the top of the box, 75th percentile; and the upper whisker, 95th percentile.

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### Information

Yield difference is the yield of ILeVO minus the yield of the control.
One dot represents one replicate within a trial. The yield differences are grouped by soil texture.
The boxplot indicates the range of the yield differences. The box plot from bottom to top includes:
the lower whisker, 5th percentile; the bottom of the box, 25th percentile; the median yield difference (horizontal line within the box);
the top of the box, 75th percentile; and the upper whisker, 95th percentile.

Yield change is the percentage of yield gain (if positive) or yield loss (if negative) using ILeVO vs the control. One dot represents one replicate within a trial. The yield differences are grouped by soil texture. The boxplot indicates the range of the yield change (%). The box plot from bottom to top includes: the lower whisker, 5th percentile; the bottom of the box, 25th percentile; the median % yield change, (the horizontal line within the box); the top of the box, 75th percentile; and the upper whisker, 95th percentile.

Yield change is the percentage of yield gain (if positive) or yield loss (if negative) using ILeVO vs the control. One dot represents one replicate within a trial. The yield differences are grouped by soil texture. The boxplot indicates the range of the yield change (%). The box plot from bottom to top includes: the lower whisker, 5th percentile; the bottom of the box, 25th percentile; the median % yield change, (the horizontal line within the box); the top of the box, 75th percentile; and the upper whisker, 95th percentile.

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### Key results

Across all trials, Ilevo nematicide treatments produced a yield response
of 0.2 bu/acre with a 90% confidence interval from 0.1 to 0.7 bu/acre.

### Break-Even Analysis

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### Yield Change Results

Across all trials, Clariva nematicide treatments produced a yield change
of 1.1% with a 90% confidence interval from 0.2 to 2.0%.

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### Information

This graph shows the relationship between the Yield at the control and the mean yield response to ILeVo for individual trials.

The flatter the smoother line, the weaker the relationship. A downward sloping line, for example, would indicate that ILeVO had a positive effect only in low yielding or high stressed fields. Based on 26 trials, the smoother line for ILeVO is relatively flat.

The flatter the smoother line, the weaker the relationship. A downward sloping line, for example, would indicate that ILeVO had a positive effect only in low yielding or high stressed fields. Based on 26 trials, the smoother line for ILeVO is relatively flat.

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### Information

This graph shows the relationship between yield response and rainfall (inches) in individual trials.

The flatter the smoother line, the weaker the relationship. Rainfall had little effect on ILeVO performance.

The flatter the smoother line, the weaker the relationship. Rainfall had little effect on ILeVO performance.

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### Information

This graph shows the relationship between yield response and cumulative GDD (F) across trials for different years.

The flatter the smoother line, the weaker the relationship. GDD had no effect on ILeVO performance.

The flatter the smoother line, the weaker the relationship. GDD had no effect on ILeVO performance.

### Conclusions

- Of the 26 trials on soybean in 2015 and 2016, 11 trials had significant yield responses of 0.7, 0.9, 1.0, 1.0, 1.3, 1.3, 1.4, 1.6, 2.2, 3.0, and 3.3 bu/acre.
- In 2015 and 2016, ILeVO seed treatments increased yield on average by 0.6 bu/acre, with a 90% confidence interval from 0.2 to 1.1 bu/acre .
- ILeVO significantly increased soybean yield in about 40% of trials, but the majority of the3se increases were relatively small.

### What was done

Soybean often yield higher when planted in narrow versus wide row spacing.
While the evidence of yield benefits from narrow row spacing is well documented,
many farmers are hesitant to switch to narrow row spacing due to required investment
in new planters and the higher risk of soybean disease in narrow rows. These
on-farm trials were designed to document the benefits of narrow row spacing by planting
15-inch row replicated treatments using a 30-inch row planter. The 15-inch row treatments were
planted twice using autosteering or GPS guidance systems with a 30-inch row planter.

### Trial Locations

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### Information

The map of Iowa shows county lines (black) and landform regions (gray) to clarify trial locations
and general topographical attributes. The bulk of Iowa’s landmass falls primarily into 4 regions:
Northwest Plains, Des Moines Lobe, and Iowan Surface, from west to east across the northern half of
the state, and Southern Iowa Drift Plain across the southern half of the state.

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### Monthly Rainfall Information

The reference rainfall (indicated by the gray bars) represents the mean
monthly rainfall for Years 2010 and 2014-2016 in Iowa. Source: Iowa Mesonet

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### Growing Degree Days Information

Growing degree days (GDD) is a measure of heat accumulation used to
predict plant and pest development rates, including crop maturity.

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### Information

Yield difference is the yield of the treated replications minus the yield of the paired control replications.
The stars represent average yield differences for individual trials (bu/acre). Each dot represents one replicate within a trial.

Yield change is the percentage of yield gain (if positive) or yield loss (if negative) using the treatment. The stars represent average yield changes for individual trials (%). Each dot represents one replicate within a trial.

Yield change is the percentage of yield gain (if positive) or yield loss (if negative) using the treatment. The stars represent average yield changes for individual trials (%). Each dot represents one replicate within a trial.

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### Information

Yield difference is the yield of 15-inch rows minus the yield of 30-inch rows.
One dot represents one replicate within a trial. The yield differences are grouped by soil texture.
The boxplot indicates the range of the yield differences. The box plot from bottom to top includes:
the lower whisker, 5th percentile; the bottom of the box, 25th percentile; the median yield difference (horizontal line within the box);
the top of the box, 75th percentile; and the upper whisker, 95th percentile.

Yield change is the percentage of yield gain (if positive) or yield loss (if negative) using 15-inch rows vs 30-inch rows. One dot represents one replicate within a trial. The yield differences are grouped by soil texture. The boxplot indicates the range of the yield change (%). The box plot from bottom to top includes: the lower whisker, 5th percentile; the bottom of the box, 25th percentile; the median % yield change, (the horizontal line within the box); the top of the box, 75th percentile; and the upper whisker, 95th percentile.

Yield change is the percentage of yield gain (if positive) or yield loss (if negative) using 15-inch rows vs 30-inch rows. One dot represents one replicate within a trial. The yield differences are grouped by soil texture. The boxplot indicates the range of the yield change (%). The box plot from bottom to top includes: the lower whisker, 5th percentile; the bottom of the box, 25th percentile; the median % yield change, (the horizontal line within the box); the top of the box, 75th percentile; and the upper whisker, 95th percentile.

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### Information

Yield difference is the yield of 15-inch rows minus the yield of 30-inch rows.
One dot represents one replicate within a trial. The yield differences are grouped by soil texture.
The boxplot indicates the range of the yield differences. The box plot from bottom to top includes:
the lower whisker, 5th percentile; the bottom of the box, 25th percentile; the median yield difference (horizontal line within the box);
the top of the box, 75th percentile; and the upper whisker, 95th percentile.

Yield change is the percentage of yield gain (if positive) or yield loss (if negative) using 15-inch rows vs 30-inch rows. One dot represents one replicate within a trial. The yield differences are grouped by soil texture. The boxplot indicates the range of the yield change (%). The box plot from bottom to top includes: the lower whisker, 5th percentile; the bottom of the box, 25th percentile; the median % yield change, (the horizontal line within the box); the top of the box, 75th percentile; and the upper whisker, 95th percentile.

Yield change is the percentage of yield gain (if positive) or yield loss (if negative) using 15-inch rows vs 30-inch rows. One dot represents one replicate within a trial. The yield differences are grouped by soil texture. The boxplot indicates the range of the yield change (%). The box plot from bottom to top includes: the lower whisker, 5th percentile; the bottom of the box, 25th percentile; the median % yield change, (the horizontal line within the box); the top of the box, 75th percentile; and the upper whisker, 95th percentile.

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### Key results

Across all trials compared with 30” row spacing, 15” row
spacing treatments produced a yield response of 0.7 bu/acre with a
90% Confidence Interval of from -0.6 to 1.9 bu/acre.

### Break-Even Analysis

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### Yield Change Results

Across all trials compared with 30” row spacing, 15” row spacing treatments produced
a yield change of 1.4% with a 90% Confidence Interval of from -1.3 to 4.2%.

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### Information

This graph shows the relationship between the Yield at the control and the mean yield response to narrow row spacing for individual trials.

The flatter the smoother line, the weaker the relationship. A downward sloping line would indicate that narrow row spacing had a more positive effect in low yielding or high stressed fields. Based on 18 trials, the smoother line for narrow row spacing is relatively flat.

The flatter the smoother line, the weaker the relationship. A downward sloping line would indicate that narrow row spacing had a more positive effect in low yielding or high stressed fields. Based on 18 trials, the smoother line for narrow row spacing is relatively flat.

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### Information

This graph shows the relationship between yield response and rainfall (inches) in individual trials.

The flatter the smoother line, the weaker the relationship. Rainfall had little effect on narrow row spacing performance.

The flatter the smoother line, the weaker the relationship. Rainfall had little effect on narrow row spacing performance.

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### Information

This graph shows the relationship between yield response and cumulative GDD (F) across trials for different years.

The flatter the smoother line, the weaker the relationship. GDD had no effect on narrow row spacing performance.

The flatter the smoother line, the weaker the relationship. GDD had no effect on narrow row spacing performance.

### Conclusions

- Of the 18 Row Spacing trials on soybean between 2010 and 2016, only 3 had significant yield responses of 2.7, 3.8 and 9.0 bu/acre.
- Compared with 30” row spacing, 15” row spacing treatments increased yield on average by 0.7 bu/acre, with a 90% confidence interval from -0.6 to 1.9 bu/acre .
- Responses to 15” row spacing tended to be greater when May-June rainfall was above average.
- The trial with largest, 9 bu/acre, yield difference had hail during the growing season. It could be that the recovery time and canopy closure was much faster with 15-inch than with 30-inch rows after the hail.

### What was done

Foliar fungicide use on soybean has increased in Iowa during the last 10 years. The objective of this
study was to use field-scale on-farm trials across Iowa to study foliar pyraclostrobin (Headline)
applications on soybean and identify when these applications produced profitable yield responses.
Most of the applications were done by farmers using ground sprayers but in about 20% trials the
foliar fungicide was aerially applied.

### Trial Locations

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### Information

The map of Iowa shows county lines (black) and landform regions (gray) to clarify trial locations
and general topographical attributes. The bulk of Iowa’s landmass falls primarily into 4 regions:Northwest Plains,
Des Moines Lobe, and Iowan Surface, from west to east across the northern half of the state,
and Southern Iowa Drift Plain across the southern half of the state.

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### Weather information

The reference rainfall (indicated by the gray bar) represents the mean monthly rainfall from 2006 to 2015 in Iowa. Source: Iowa Mesonet

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### Growing Degree Days Information

Growing degree days (GDD) is a measure of heat accumulation used to
predict plant and pest development rates, including crop maturity.

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### Information

Yield change is the percentage of yield gain (if positive) or yield loss (if negative) using the treatment. The stars represent average yield changes for individual trials (%). Each dot represents one replicate within a trial.

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### Information

Yield difference is the yield of Headline minus the yield of the control.
One dot represents one replicate within a trial. The yield differences are grouped by soil texture.
The boxplot indicates the range of the yield differences. The box plot from bottom to top includes:
the lower whisker, 5th percentile; the bottom of the box, 25th percentile; the median yield difference (horizontal line within the box);
the top of the box, 75th percentile; and the upper whisker, 95th percentile.

Yield change is the percentage of yield gain (if positive) or yield loss (if negative) using Headline vs the control. One dot represents one replicate within a trial. The yield differences are grouped by soil texture. The boxplot indicates the range of the yield change (%). The box plot from bottom to top includes: the lower whisker, 5th percentile; the bottom of the box, 25th percentile; the median % yield change, (the horizontal line within the box); the top of the box, 75th percentile; and the upper whisker, 95th percentile.

Yield change is the percentage of yield gain (if positive) or yield loss (if negative) using Headline vs the control. One dot represents one replicate within a trial. The yield differences are grouped by soil texture. The boxplot indicates the range of the yield change (%). The box plot from bottom to top includes: the lower whisker, 5th percentile; the bottom of the box, 25th percentile; the median % yield change, (the horizontal line within the box); the top of the box, 75th percentile; and the upper whisker, 95th percentile.

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### Information

Yield difference is the yield of Headline minus the yield of the control.
One dot represents one replicate within a trial. The yield differences are grouped by soil texture.
The boxplot indicates the range of the yield differences. The box plot from bottom to top includes:
the lower whisker, 5th percentile; the bottom of the box, 25th percentile; the median yield difference (horizontal line within the box);
the top of the box, 75th percentile; and the upper whisker, 95th percentile.

Yield change is the percentage of yield gain (if positive) or yield loss (if negative) using Headline vs the control. One dot represents one replicate within a trial. The yield differences are grouped by soil texture. The boxplot indicates the range of the yield change (%). The box plot from bottom to top includes: the lower whisker, 5th percentile; the bottom of the box, 25th percentile; the median % yield change, (the horizontal line within the box); the top of the box, 75th percentile; and the upper whisker, 95th percentile.

Yield change is the percentage of yield gain (if positive) or yield loss (if negative) using Headline vs the control. One dot represents one replicate within a trial. The yield differences are grouped by soil texture. The boxplot indicates the range of the yield change (%). The box plot from bottom to top includes: the lower whisker, 5th percentile; the bottom of the box, 25th percentile; the median % yield change, (the horizontal line within the box); the top of the box, 75th percentile; and the upper whisker, 95th percentile.

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### Key result

More than 70% the trials had significant positive yield responses to
foliar fungicide. Across all trials, Headline treatments produced a yield response
of 2.5 bu/acre with a 90% Confidence Interval ranging from 2.2 to 2.7 bu/acre.

### Break-Even Analysis

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### Yield Change Result

More than 70% the trials had significant positive yield responses to
foliar fungicide. Across all trials, Headline treatments produced a yield change
of 4.5% with a 90% Confidence Interval ranging from 4.0 to 5.0%.

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### Information

This graph shows the relationship between the Yield at the control and the mean yield response to Headline foliar fungicide for individual trials.

The flatter the smoother line, the weaker the relationship. Based on 206 trials, the relatively flat line would indicate that Headline foliar fungicide had a uniform effect across most trials.

The flatter the smoother line, the weaker the relationship. Based on 206 trials, the relatively flat line would indicate that Headline foliar fungicide had a uniform effect across most trials.

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### Information

This graph shows the relationship between yield response and rainfall (inches) in individual trials.

The flatter the smoother line, the weaker the relationship. Rainfall had little effect on Headline performance.

The flatter the smoother line, the weaker the relationship. Rainfall had little effect on Headline performance.

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### Information

This graph shows the relationship between yield response and cumulative GDD (F) across trials for different years.

The flatter the smoother line, the weaker the relationship. GDD had no effect on Headline performance.

The flatter the smoother line, the weaker the relationship. GDD had no effect on Headline performance.

### Conclusions

- Of the 206 Headline foliar fungicide trials conducted on soybean between 2006 and 2015, 139 had significant yield response to foliar pyraclostrobin fungicide ranging from 1.3 to 7.7 bu/acre for individual trials.
- Across all years, foliar application of pyraclostrobin fungicide increased yield on average by 2.5 bu/acre, with a 90% confidence interval from 2.2 to 2.7 bu/acre.

### What was done

Mid-season aphid infestations can substantially reduce soybean yields. Insecticides are used to control soybean aphids.
These on-farm trials evaluated Hero pyrethroid (bifenthrin 11.25% and zeta-cypermethrin 3.75 %) insecticide in seven trials.
Each trial had Hero applied in at least three replications compared with untreated control strips.

### Trial Locations

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### Information

The map of Iowa shows county lines (black) and landform regions (gray) to clarify trial locations
and general topographical attributes. The bulk of Iowa’s landmass falls primarily into 4 regions:Northwest Plains,
Des Moines Lobe, and Iowan Surface, from west to east across the northern half of the state,
and Southern Iowa Drift Plain across the southern half of the state.

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### Weather information

The reference rainfall (indicated by the gray bar) represents the mean monthly rainfall in 2010 in Iowa. Source: Iowa Mesonet

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### Growing Degree Days Information

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### Information

Yield change is the percentage of yield gain (if positive) or yield loss (if negative) using the treatment. The stars represent average yield changes for individual trials (%). Each dot represents one replicate within a trial.

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### Information

Yield difference is the yield of Hero minus the yield of the control.
One dot represents one replicate within a trial. The yield differences are grouped by soil texture.
The boxplot indicates the range of the yield differences. The box plot from bottom to top includes:
the lower whisker, 5th percentile; the bottom of the box, 25th percentile; the median yield difference (horizontal line within the box);
the top of the box, 75th percentile; and the upper whisker, 95th percentile.

Yield change is the percentage of yield gain (if positive) or yield loss (if negative) using Hero vs the control. One dot represents one replicate within a trial. The yield differences are grouped by soil texture. The boxplot indicates the range of the yield change (%). The box plot from bottom to top includes: the lower whisker, 5th percentile; the bottom of the box, 25th percentile; the median % yield change, (the horizontal line within the box); the top of the box, 75th percentile; and the upper whisker, 95th percentile.

Yield change is the percentage of yield gain (if positive) or yield loss (if negative) using Hero vs the control. One dot represents one replicate within a trial. The yield differences are grouped by soil texture. The boxplot indicates the range of the yield change (%). The box plot from bottom to top includes: the lower whisker, 5th percentile; the bottom of the box, 25th percentile; the median % yield change, (the horizontal line within the box); the top of the box, 75th percentile; and the upper whisker, 95th percentile.

### Information

We are sorry this graph is not available due to missing data.

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### Key result

Across all trials, Hero insecticide treatments produced a yield response of 1.1 bu/acre with a 90% confidence interval from 0.0 to 2.3 bu/acre.

### Break-Even Analysis

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### Yield Change Results

Across all trials, Hero insecticide treatments produced a yield change
of 1.7% with a 90% confidence interval from -1.6 to 5.1%.

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### Information

This graph shows the relationship between the Yield at the control and the mean yield response to Hero insecticide for individual trials.

The flatter the smoother line, the weaker the relationship. Based on only 6 trials, the relatively flat line would indicate that Hero insecticide had a uniform effect across most trials.

The flatter the smoother line, the weaker the relationship. Based on only 6 trials, the relatively flat line would indicate that Hero insecticide had a uniform effect across most trials.

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### Information

This graph shows the relationship between yield response and rainfall (inches) in individual trials.

The flatter the smoother line, the weaker the relationship. Rainfall had little effect on Hero performance.

The flatter the smoother line, the weaker the relationship. Rainfall had little effect on Hero performance.

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### Information

This graph shows the relationship between yield response and cumulative GDD (F) across trials for different years.

The flatter the smoother line, the weaker the relationship. GDD had no effect on Hero performance.

The flatter the smoother line, the weaker the relationship. GDD had no effect on Hero performance.

### Conclusions

- Of the 7 aphid insecticide trials conducted in 2010, at 10% significane level, 2 trials in soybean had a positive yield response to Hero insecticide of 1.2, and 1.3 bu/acre.
- In 2010, application of Hero insecticide increased yield on average by 1.1 bu/acre, with a 90% confidence interval from 0.0 to 2.3 bu/acre.
- Aphid pressure was not documented.

### What was done

Soybean plants require large amount of nitrogen. Increasing soybean biological fixation may lead to higher yields.
The objective of this on-farm study was to determine the yield benefits of TerraMax (Bradyrhizobium-based inoculant) on soybean.
Fifteen two-treatment on-farm replicated strip trials were conducted in 2017. TerraMax treatments were applied in furrow during planting and compared to untreated control in each trial.

### Trial Locations

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### Information

The map of Iowa shows county lines (black) and landform regions (gray) to clarify trial locations
and general topographical attributes. The bulk of Iowa’s landmass falls primarily into 4 regions:
Northwest Plains, Des Moines Lobe, and Iowan Surface, from west to east across the northern half of
the state, and Southern Iowa Drift Plain across the southern half of the state.

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### Monthly Rainfall Information

The reference rainfall (indicated by the gray bars) represents the mean monthly rainfall in 2017 in Iowa. Source: Iowa Mesonet

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### Growing Degree Days Information

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### Information

Yield change is the percentage of yield gain (if positive) or yield loss (if negative) using the treatment. The stars represent average yield changes for individual trials (%). Each dot represents one replicate within a trial.

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### Information

Yield difference is the yield of TerraMax minus the yield of the control.
One dot represents one replicate within a trial. The yield differences are grouped by soil texture.
The boxplot indicates the range of the yield differences. The box plot from bottom to top includes:
the lower whisker, 5th percentile; the bottom of the box, 25th percentile; the median yield difference (horizontal line within the box);
the top of the box, 75th percentile; and the upper whisker, 95th percentile.

Yield change is the percentage of yield gain (if positive) or yield loss (if negative) using TerraMax vs the control. One dot represents one replicate within a trial. The yield differences are grouped by soil texture. The boxplot indicates the range of the yield change (%). The box plot from bottom to top includes: the lower whisker, 5th percentile; the bottom of the box, 25th percentile; the median % yield change, (the horizontal line within the box); the top of the box, 75th percentile; and the upper whisker, 95th percentile.

Yield change is the percentage of yield gain (if positive) or yield loss (if negative) using TerraMax vs the control. One dot represents one replicate within a trial. The yield differences are grouped by soil texture. The boxplot indicates the range of the yield change (%). The box plot from bottom to top includes: the lower whisker, 5th percentile; the bottom of the box, 25th percentile; the median % yield change, (the horizontal line within the box); the top of the box, 75th percentile; and the upper whisker, 95th percentile.

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### Information

Yield difference is the yield of TerraMax minus the yield of the control.
One dot represents one replicate within a trial. The yield differences are grouped by soil texture.
The boxplot indicates the range of the yield differences. The box plot from bottom to top includes:
the lower whisker, 5th percentile; the bottom of the box, 25th percentile; the median yield difference (horizontal line within the box);
the top of the box, 75th percentile; and the upper whisker, 95th percentile.

Yield change is the percentage of yield gain (if positive) or yield loss (if negative) using TerraMax vs the control. One dot represents one replicate within a trial. The yield differences are grouped by soil texture. The boxplot indicates the range of the yield change (%). The box plot from bottom to top includes: the lower whisker, 5th percentile; the bottom of the box, 25th percentile; the median % yield change, (the horizontal line within the box); the top of the box, 75th percentile; and the upper whisker, 95th percentile.

Yield change is the percentage of yield gain (if positive) or yield loss (if negative) using TerraMax vs the control. One dot represents one replicate within a trial. The yield differences are grouped by soil texture. The boxplot indicates the range of the yield change (%). The box plot from bottom to top includes: the lower whisker, 5th percentile; the bottom of the box, 25th percentile; the median % yield change, (the horizontal line within the box); the top of the box, 75th percentile; and the upper whisker, 95th percentile.

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### Key results

Across all trials, TerraMax Biological treatments produced a yield response of -0.0 bu/acre with a 90% confidence interval from -0.7 to 0.7 bu/acre.

### Break-Even Analysis

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### Yield Change Results

Across all trials, TerraMax biological treatments produced a yield change
of 0.0% with a 90% confidence interval from -1.9 to 2.0%.

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### Information

This graph shows the relationship between the Yield at the control and the mean yield response to TerraMax biological for individual trials.

The flatter the smoother line, the weaker the relationship. Based on 15 trials, the relatively flat line would indicate that TerraMax biological had a uniform effect across most trials

The flatter the smoother line, the weaker the relationship. Based on 15 trials, the relatively flat line would indicate that TerraMax biological had a uniform effect across most trials

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### Information

This graph shows the relationship between yield response and rainfall (inches) in individual trials.

The flatter the smoother line, the weaker the relationship. Rainfall had little effect on TerraMax performance.

The flatter the smoother line, the weaker the relationship. Rainfall had little effect on TerraMax performance.

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### Information

This graph shows the relationship between yield response and cumulative GDD (F) across trials for different years.

The flatter the smoother line, the weaker the relationship. GDD had no effect on TerraMax performance.

The flatter the smoother line, the weaker the relationship. GDD had no effect on TerraMax performance.

### Conclusions

- Of the 15 biological innoculant trials on soybean in 2017, TerraMax Bradyrhizobium-based inoculant had no significant effect on soybean yield.
- The average yield response to TerraMax was 0.0 bu/acre, with a 90% confidence interval from -0.7 to 0.7 bu/acre.

### What was done

A new generation of biological products are designed to increase leaf chlorophyll concentration, root biological activity and stress tolerance.
The objective of this on-farm study was to evaluate Vitazyme, a biostimulant (brassinosteroids, 1-triacontanol, and B vitamins) on soybean in Iowa.
Ten two-treatment on-farm replicated strip trials were conducted between 2014 and 2015. Vitazyme treatments were foliar applied and compared to untreated strips.

### Trial Locations

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### Information

The map of Iowa shows county lines (black) and landform regions (gray) to clarify trial locations
and general topographical attributes. The bulk of Iowa landmass falls primarily into 4 regions:
Northwest Plains, Des Moines Lobe, and Iowan Surface, from west to east across the northern half of
the state, and Southern Iowa Drift Plain across the southern half of the state.

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### Monthly Rainfall Information

The reference rainfall (indicated by the gray bars) represents the mean
monthly rainfall for Years 2014-2015 in Iowa. Source: Iowa Mesonet

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### Growing Degree Days Information

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### Information

Yield change is the percentage of yield gain (if positive) or yield loss (if negative) using the treatment. The stars represent average yield changes for individual trials (%). Each dot represents one replicate within a trial.

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### Information

Yield difference is the yield of Vitazyme minus the yield of the control.
One dot represents one replicate within a trial. The yield differences are grouped by soil texture.
The boxplot indicates the range of the yield differences. The box plot from bottom to top includes:
the lower whisker, 5th percentile; the bottom of the box, 25th percentile; the median yield difference (horizontal line within the box);
the top of the box, 75th percentile; and the upper whisker, 95th percentile.

Yield change is the percentage of yield gain (if positive) or yield loss (if negative) using Vitazyme vs the control. One dot represents one replicate within a trial. The yield differences are grouped by soil texture. The boxplot indicates the range of the yield change (%). The box plot from bottom to top includes: the lower whisker, 5th percentile; the bottom of the box, 25th percentile; the median % yield change, (the horizontal line within the box); the top of the box, 75th percentile; and the upper whisker, 95th percentile.

Yield change is the percentage of yield gain (if positive) or yield loss (if negative) using Vitazyme vs the control. One dot represents one replicate within a trial. The yield differences are grouped by soil texture. The boxplot indicates the range of the yield change (%). The box plot from bottom to top includes: the lower whisker, 5th percentile; the bottom of the box, 25th percentile; the median % yield change, (the horizontal line within the box); the top of the box, 75th percentile; and the upper whisker, 95th percentile.

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### Information

Yield difference is the yield of Vitazyme minus the yield of the control.
One dot represents one replicate within a trial. The yield differences are grouped by soil texture.
The boxplot indicates the range of the yield differences. The box plot from bottom to top includes:
the lower whisker, 5th percentile; the bottom of the box, 25th percentile; the median yield difference (horizontal line within the box);
the top of the box, 75th percentile; and the upper whisker, 95th percentile.

Yield change is the percentage of yield gain (if positive) or yield loss (if negative) using Vitazyme vs the control. One dot represents one replicate within a trial. The yield differences are grouped by soil texture. The boxplot indicates the range of the yield change (%). The box plot from bottom to top includes: the lower whisker, 5th percentile; the bottom of the box, 25th percentile; the median % yield change, (the horizontal line within the box); the top of the box, 75th percentile; and the upper whisker, 95th percentile.

Yield change is the percentage of yield gain (if positive) or yield loss (if negative) using Vitazyme vs the control. One dot represents one replicate within a trial. The yield differences are grouped by soil texture. The boxplot indicates the range of the yield change (%). The box plot from bottom to top includes: the lower whisker, 5th percentile; the bottom of the box, 25th percentile; the median % yield change, (the horizontal line within the box); the top of the box, 75th percentile; and the upper whisker, 95th percentile.

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### Key results

Across all trials, Vitazyme Biostimulant insecticide treatments produced a yield response of -0.1 bu/acre with a 90% confidence interval from -0.8 to 0.8 bu/acre.

### Break-Even Analysis

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### Yield Change Results

Across all trials, Vitazyme biostimulant treatments produced a yield change
of -0.4% with a 90% confidence interval from -2.4 to 1.7%.

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### Information

This graph shows the relationship between the Yield at the control and the mean yield response to Vitazyme biostimulant for individual trials.

The flatter the smoother line, the weaker the relationship. Based on 10 trials, the relatively flat line would indicate that Vitazyme biostimulant had a uniform effect across most trials.

The flatter the smoother line, the weaker the relationship. Based on 10 trials, the relatively flat line would indicate that Vitazyme biostimulant had a uniform effect across most trials.

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### Information

This graph shows the relationship between yield response and rainfall (inches) in individual trials.

The flatter the smoother line, the weaker the relationship. Rainfall had little effect on Vitazyme performance.

The flatter the smoother line, the weaker the relationship. Rainfall had little effect on Vitazyme performance.

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### Information

This graph shows the relationship between yield response and cumulative GDD (F) across trials for different years.

The flatter the smoother line, the weaker the relationship. GDD had no effect on Vitazyme performance.

The flatter the smoother line, the weaker the relationship. GDD had no effect on Vitazyme performance.

### Conclusions

- Of the 10 trials on soybean in 2014 and 2015, Vitazyme brassinosteroids, 1-triacontanol, and B vitamins biostimulant had no significant effect on soybean yield.
- The average yield response to Vitazyme biostimulant was -0.1 bu/acre, with a 90% confidence interval from -0.8 to 0.8 bu/acre.

### What was done

Sulfur deficiencies have been reported recently in Iowa. The objective of this on-farm study was to determine whether Sulfur applications on soybean can increase yields.
Fifteen two-treatment replicated strip trials were conducted by farmers in 2011. Sulfur in the form of SuperCal SO4 was broadcast at a rate of 50 lb S/acre and incorporated in the soil before soybean planting.
The Sulfur treatments were compared to the untreated control.

### Trial Locations

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### Information

The map of Iowa shows county lines (black) and landform regions (gray) to clarify trial locations
and general topographical attributes. The bulk of Iowa landmass falls primarily into 4 regions:
Northwest Plains, Des Moines Lobe, and Iowan Surface, from west to east across the northern half of
the state, and Southern Iowa Drift Plain across the southern half of the state.

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### Monthly Rainfall Information

The reference rainfall (indicated by the gray bars) represents the mean
monthly rainfall for 2011 in Iowa. Source: Iowa Mesonet

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### Growing Degree Days Information

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### Information

Yield change is the percentage of yield gain (if positive) or yield loss (if negative) using the treatment. The stars represent average yield changes for individual trials (%). Each dot represents one replicate within a trial.

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### Information

Yield difference is the yield of SuperCal SO4 minus the yield of the control.
One dot represents one replicate within a trial. The yield differences are grouped by soil texture.
The boxplot indicates the range of the yield differences. The box plot from bottom to top includes:
the lower whisker, 5th percentile; the bottom of the box, 25th percentile; the median yield difference (horizontal line within the box);
the top of the box, 75th percentile; and the upper whisker, 95th percentile.

Yield change is the percentage of yield gain (if positive) or yield loss (if negative) using SuperCal SO4 vs the control. One dot represents one replicate within a trial. The yield differences are grouped by soil texture. The boxplot indicates the range of the yield change (%). The box plot from bottom to top includes: the lower whisker, 5th percentile; the bottom of the box, 25th percentile; the median % yield change, (the horizontal line within the box); the top of the box, 75th percentile; and the upper whisker, 95th percentile.

Yield change is the percentage of yield gain (if positive) or yield loss (if negative) using SuperCal SO4 vs the control. One dot represents one replicate within a trial. The yield differences are grouped by soil texture. The boxplot indicates the range of the yield change (%). The box plot from bottom to top includes: the lower whisker, 5th percentile; the bottom of the box, 25th percentile; the median % yield change, (the horizontal line within the box); the top of the box, 75th percentile; and the upper whisker, 95th percentile.

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### Information

Yield difference is the yield of SuperCal SO4 minus the yield of the control.
One dot represents one replicate within a trial. The yield differences are grouped by soil texture.
The boxplot indicates the range of the yield differences. The box plot from bottom to top includes:
the lower whisker, 5th percentile; the bottom of the box, 25th percentile; the median yield difference (horizontal line within the box);
the top of the box, 75th percentile; and the upper whisker, 95th percentile.

Yield change is the percentage of yield gain (if positive) or yield loss (if negative) using SuperCal SO4 vs the control. One dot represents one replicate within a trial. The yield differences are grouped by soil texture. The boxplot indicates the range of the yield change (%). The box plot from bottom to top includes: the lower whisker, 5th percentile; the bottom of the box, 25th percentile; the median % yield change, (the horizontal line within the box); the top of the box, 75th percentile; and the upper whisker, 95th percentile.

Yield change is the percentage of yield gain (if positive) or yield loss (if negative) using SuperCal SO4 vs the control. One dot represents one replicate within a trial. The yield differences are grouped by soil texture. The boxplot indicates the range of the yield change (%). The box plot from bottom to top includes: the lower whisker, 5th percentile; the bottom of the box, 25th percentile; the median % yield change, (the horizontal line within the box); the top of the box, 75th percentile; and the upper whisker, 95th percentile.

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### Key results

Across all trials, Sulfur Nutrient treatments produced a yield response of -0.9 bu/acre with a 90% confidence interval from -1.7 to -0.1 bu/acre.

### Break-Even Analysis

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### Yield Change Results

Across all trials, Sulfur Nutrient treatments produced a yield change
of -1.8% with a 90% confidence interval from -3.6 to 0.1%.

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### Information

This graph shows the relationship between the Yield at the control and the mean yield response to SuperCal SO4 pelletized Sulfur for individual trials.

The flatter the smoother line, the weaker the relationship. Based on 15 trials, the relatively flat line would indicate that SuperCal SO4 pelletized Sulfur had a uniform effect across most trials.

The flatter the smoother line, the weaker the relationship. Based on 15 trials, the relatively flat line would indicate that SuperCal SO4 pelletized Sulfur had a uniform effect across most trials.

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### Information

This graph shows the relationship between yield response and rainfall (inches) in individual trials.

The flatter the smoother line, the weaker the relationship. Rainfall had little effect on SuperCal SO4 pelletized Sulfur performance.

The flatter the smoother line, the weaker the relationship. Rainfall had little effect on SuperCal SO4 pelletized Sulfur performance.

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### Information

This graph shows the relationship between yield response and cumulative GDD (F) across trials for different years.

The flatter the smoother line, the weaker the relationship. GDD had no effect on SuperCal SO4 pelletized Sulfur performance.

The flatter the smoother line, the weaker the relationship. GDD had no effect on SuperCal SO4 pelletized Sulfur performance.

### Conclusions

- Of the 15 sulfur trials on soybean in 2011, SuperCal SO4 pelletized gypsum had no significant effect on soybean yield.
- The average yield response to SuperCal SO4 pelletized gypsum was -0.9 bu/acre, with a 90% confidence interval from -1.7 to -0.1 bu/acre.

### What was done

Gypsum sulfur applications may have residual effects on soil and crop yield beyond the first year.
The objective of this on-farm study was to measure soybean yield effects from SuperCal SO4 applications to the previous corn crop.
The yield data were collected in 2012 from strips that received SuperCal SO4 in 2011.

### Trial Locations

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### Information

The map of Iowa shows county lines (black) and landform regions (gray) to clarify trial locations
and general topographical attributes. The bulk of Iowa landmass falls primarily into 4 regions:
Northwest Plains, Des Moines Lobe, and Iowan Surface, from west to east across the northern half of
the state, and Southern Iowa Drift Plain across the southern half of the state.

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### Monthly Rainfall Information

The reference rainfall (indicated by the gray bars) represents the mean
monthly rainfall for 2012 in Iowa. Source: Iowa Mesonet

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### Growing Degree Days Information

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### Information

Yield change is the percentage of yield gain (if positive) or yield loss (if negative) using the treatment. The stars represent average yield changes for individual trials (%). Each dot represents one replicate within a trial.

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### Information

Yield difference is the yield of residual SuperCal SO4 minus the yield of the control.
One dot represents one replicate within a trial. The yield differences are grouped by soil texture.
The boxplot indicates the range of the yield differences. The box plot from bottom to top includes:
the lower whisker, 5th percentile; the bottom of the box, 25th percentile; the median yield difference (horizontal line within the box);
the top of the box, 75th percentile; and the upper whisker, 95th percentile.

Yield change is the percentage of yield gain (if positive) or yield loss (if negative) using residual SuperCal SO4 vs the control. One dot represents one replicate within a trial. The yield differences are grouped by soil texture. The boxplot indicates the range of the yield change (%). The box plot from bottom to top includes: the lower whisker, 5th percentile; the bottom of the box, 25th percentile; the median % yield change, (the horizontal line within the box); the top of the box, 75th percentile; and the upper whisker, 95th percentile.

Yield change is the percentage of yield gain (if positive) or yield loss (if negative) using residual SuperCal SO4 vs the control. One dot represents one replicate within a trial. The yield differences are grouped by soil texture. The boxplot indicates the range of the yield change (%). The box plot from bottom to top includes: the lower whisker, 5th percentile; the bottom of the box, 25th percentile; the median % yield change, (the horizontal line within the box); the top of the box, 75th percentile; and the upper whisker, 95th percentile.

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### Information

Yield difference is the yield of residual SuperCal SO4 minus the yield of the control.
One dot represents one replicate within a trial. The yield differences are grouped by soil texture.
The boxplot indicates the range of the yield differences. The box plot from bottom to top includes:
the lower whisker, 5th percentile; the bottom of the box, 25th percentile; the median yield difference (horizontal line within the box);
the top of the box, 75th percentile; and the upper whisker, 95th percentile.

Yield change is the percentage of yield gain (if positive) or yield loss (if negative) using residual SuperCal SO4 vs the control. One dot represents one replicate within a trial. The yield differences are grouped by soil texture. The boxplot indicates the range of the yield change (%). The box plot from bottom to top includes: the lower whisker, 5th percentile; the bottom of the box, 25th percentile; the median % yield change, (the horizontal line within the box); the top of the box, 75th percentile; and the upper whisker, 95th percentile.

Yield change is the percentage of yield gain (if positive) or yield loss (if negative) using residual SuperCal SO4 vs the control. One dot represents one replicate within a trial. The yield differences are grouped by soil texture. The boxplot indicates the range of the yield change (%). The box plot from bottom to top includes: the lower whisker, 5th percentile; the bottom of the box, 25th percentile; the median % yield change, (the horizontal line within the box); the top of the box, 75th percentile; and the upper whisker, 95th percentile.

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### Key results

Across all trials, Residual Sulfur Nutrient treatments produced a yield response of 0.1 bu/acre with a 90% confidence interval from -1.3 to 1.3 bu/acre.

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### Yield Change Results

Across all trials, Residual Sulfur Nutrient treatments produced a yield change
of 0.2% with a 90% confidence interval from -3.3 to 4.0%.

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### Information

This graph shows the relationship between the Yield at the control and the mean yield response to residual SuperCal SO4 pelletized Sulfur for individual trials.

The flatter the smoother line, the weaker the relationship. Based on only 6 trials, the relatively flat line would indicate that residual SuperCal SO4 pelletized Sulfur had a uniform effect across most trials.

The flatter the smoother line, the weaker the relationship. Based on only 6 trials, the relatively flat line would indicate that residual SuperCal SO4 pelletized Sulfur had a uniform effect across most trials.

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### Information

This graph shows the relationship between yield response and rainfall (inches) in individual trials.

The flatter the smoother line, the weaker the relationship. The upward sloping line would indicate that rainfall had a more positive effect on performance in higher yielding or unstressed fields.

The flatter the smoother line, the weaker the relationship. The upward sloping line would indicate that rainfall had a more positive effect on performance in higher yielding or unstressed fields.

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### Information

This graph shows the relationship between yield response and cumulative GDD (F) across trials for different years.

The flatter the smoother line, the weaker the relationship. GDD had no effect on residual SuperCal SO4 pelletized Sulfur performance.

The flatter the smoother line, the weaker the relationship. GDD had no effect on residual SuperCal SO4 pelletized Sulfur performance.

### Conclusions

- Of the 6 residual sulfur trials treated with SuperCal SO4 pelletized gypsum in 2011, no trials had significant yield responses to Residual Sulfur in 2012.
- In 2012, Residual Sulfur nutrient increased yield on average by 0.1 bu/acre, with a 90% confidence interval from -1.3 to 1.3 bu/acre.

### What was done

Maintaining optimum soil pH is important for plant growth. The objective of this on-farm study was to evaluate agronomic and economic benefits of SuperCal 98G, pelletized lime, on soybean yield.
Ten two-treatment replicated strip trials were conducted in 2014 and 2015. The pelletized Lime was ground applied at 600 lb/acre and incorporated into the soil before planting.

### Trial Locations

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### Information

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### Monthly Rainfall Information

The reference rainfall (indicated by the gray bars) represents the mean
monthly rainfall for Years 2014-2015 in Iowa. Source: Iowa Mesonet

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### Growing Degree Days Information

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### Information

Yield change is the percentage of yield gain (if positive) or yield loss (if negative) using the treatment. The stars represent average yield changes for individual trials (%). Each dot represents one replicate within a trial.

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### Information

Yield difference is the yield of SuperCal G98 pelletized lime minus the yield of the control.
One dot represents one replicate within a trial. The yield differences are grouped by soil texture.
The boxplot indicates the range of the yield differences. The box plot from bottom to top includes:
the lower whisker, 5th percentile; the bottom of the box, 25th percentile; the median yield difference (horizontal line within the box);
the top of the box, 75th percentile; and the upper whisker, 95th percentile.

Yield change is the percentage of yield gain (if positive) or yield loss (if negative) using SuperCal G98 pelletized lime vs the control. One dot represents one replicate within a trial. The yield differences are grouped by soil texture. The boxplot indicates the range of the yield change (%). The box plot from bottom to top includes: the lower whisker, 5th percentile; the bottom of the box, 25th percentile; the median % yield change, (the horizontal line within the box); the top of the box, 75th percentile; and the upper whisker, 95th percentile.

Yield change is the percentage of yield gain (if positive) or yield loss (if negative) using SuperCal G98 pelletized lime vs the control. One dot represents one replicate within a trial. The yield differences are grouped by soil texture. The boxplot indicates the range of the yield change (%). The box plot from bottom to top includes: the lower whisker, 5th percentile; the bottom of the box, 25th percentile; the median % yield change, (the horizontal line within the box); the top of the box, 75th percentile; and the upper whisker, 95th percentile.

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### Information

Yield difference is the yield of SuperCal G98 pelletized lime minus the yield of the control.
One dot represents one replicate within a trial. The yield differences are grouped by soil texture.
The boxplot indicates the range of the yield differences. The box plot from bottom to top includes:
the lower whisker, 5th percentile; the bottom of the box, 25th percentile; the median yield difference (horizontal line within the box);
the top of the box, 75th percentile; and the upper whisker, 95th percentile.

Yield change is the percentage of yield gain (if positive) or yield loss (if negative) using SuperCal G98 pelletized lime vs the control. One dot represents one replicate within a trial. The yield differences are grouped by soil texture. The boxplot indicates the range of the yield change (%). The box plot from bottom to top includes: the lower whisker, 5th percentile; the bottom of the box, 25th percentile; the median % yield change, (the horizontal line within the box); the top of the box, 75th percentile; and the upper whisker, 95th percentile.

Yield change is the percentage of yield gain (if positive) or yield loss (if negative) using SuperCal G98 pelletized lime vs the control. One dot represents one replicate within a trial. The yield differences are grouped by soil texture. The boxplot indicates the range of the yield change (%). The box plot from bottom to top includes: the lower whisker, 5th percentile; the bottom of the box, 25th percentile; the median % yield change, (the horizontal line within the box); the top of the box, 75th percentile; and the upper whisker, 95th percentile.

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### Key results

Across all trials, Pelletized Lime treatments produced a yield response of 0.6 bu/acre with a 90% confidence interval from -0.2 to 1.3 bu/acre.

### Break-Even Analysis

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### Yield Change Results

Across all trials, Pelletized Lime treatments produced a yield change
of 1.2% with a 90% confidence interval from -0.9 to 3.3%.

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### Information

This graph shows the relationship between the Yield at the control and the mean yield response to SuperCal 98G pelletized Lime for individual trials.

The flatter the smoother line, the weaker the relationship. Based on 10 trials, the relatively flat line would indicate that SuperCal 98G pelletized Lime had a uniform effect across most trials.

The flatter the smoother line, the weaker the relationship. Based on 10 trials, the relatively flat line would indicate that SuperCal 98G pelletized Lime had a uniform effect across most trials.

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### Information

This graph shows the relationship between yield response and rainfall (inches) in individual trials.

The flatter the smoother line, the weaker the relationship. Rainfall had little effect on SuperCal 98G pelletized Lime performance.

The flatter the smoother line, the weaker the relationship. Rainfall had little effect on SuperCal 98G pelletized Lime performance.

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### Information

This graph shows the relationship between yield response and cumulative GDD (F) across trials for different years.

The flatter the smoother line, the weaker the relationship. GDD had no effect on SuperCal 98G pelletized Lime performance.

The flatter the smoother line, the weaker the relationship. GDD had no effect on SuperCal 98G pelletized Lime performance.

### Conclusions

- Of the 10 lime trials on soybean conducted in 2014 and 2015, SuperCal 98G Pelletized lime had no significant effect on soybean yield.
- In 2014 and 2015, Pelletized Lime nutrient increased yield on average by 0.6 bu/acre, with a 90% confidence interval from -0.2 to 1.3 bu/acre.

### What was done

The corn root worm (CRW) is the larva stage of the corn root worm
beetle. CRW feed on corn roots and can drastically reduce the root mass
of the corn plant reducing yield. The objective was to evaluate the use
of a soil applied insecticide (SAI) in conjunction with BT traited corn
and its effect on yield. 33 on-farm replicated strip trials were conducted
from 2005 through 2015. The treatments consisted of Tebupirimphos and
Cyfluthrin (Aztec) applied in-furrow with a farmer chosen CRW resistant corn
hybrid and an untreated check with the same farmer chosen CRW resistant corn hybrid.

### Trial Locations

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### Information

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### Weather information

The reference rainfall (indicated by the gray bar) represents
the mean monthly rainfall from 2008 to 2015 in Iowa. Source: Iowa Mesonet

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### Growing Degree Days Information

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### Information

Yield change is the percentage of yield gain (if positive) or yield loss (if negative) using the treatment. The stars represent average yield changes for individual trials (%). Each dot represents one replicate within a trial.

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### Information

Yield difference is the yield of soil applied insecticide minus the yield of the control.
One dot represents one replicate within a trial. The yield differences are grouped by soil texture.
The boxplot indicates the range of the yield differences. The box plot from bottom to top includes:
the lower whisker, 5th percentile; the bottom of the box, 25th percentile; the median yield difference (horizontal line within the box);
the top of the box, 75th percentile; and the upper whisker, 95th percentile.

Yield change is the percentage of yield gain (if positive) or yield loss (if negative) using soil applied insecticide vs the control. One dot represents one replicate within a trial. The yield differences are grouped by soil texture. The boxplot indicates the range of the yield change (%). The box plot from bottom to top includes: the lower whisker, 5th percentile; the bottom of the box, 25th percentile; the median % yield change, (the horizontal line within the box); the top of the box, 75th percentile; and the upper whisker, 95th percentile.

Yield change is the percentage of yield gain (if positive) or yield loss (if negative) using soil applied insecticide vs the control. One dot represents one replicate within a trial. The yield differences are grouped by soil texture. The boxplot indicates the range of the yield change (%). The box plot from bottom to top includes: the lower whisker, 5th percentile; the bottom of the box, 25th percentile; the median % yield change, (the horizontal line within the box); the top of the box, 75th percentile; and the upper whisker, 95th percentile.

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### Information

Yield difference is the yield of soil applied insecticide minus the yield of the control.
One dot represents one replicate within a trial. The yield differences are grouped by soil texture.
The boxplot indicates the range of the yield differences. The box plot from bottom to top includes:
the lower whisker, 5th percentile; the bottom of the box, 25th percentile; the median yield difference (horizontal line within the box);
the top of the box, 75th percentile; and the upper whisker, 95th percentile.

Yield change is the percentage of yield gain (if positive) or yield loss (if negative) using soil applied insecticide vs the control. One dot represents one replicate within a trial. The yield differences are grouped by soil texture. The boxplot indicates the range of the yield change (%). The box plot from bottom to top includes: the lower whisker, 5th percentile; the bottom of the box, 25th percentile; the median % yield change, (the horizontal line within the box); the top of the box, 75th percentile; and the upper whisker, 95th percentile.

Yield change is the percentage of yield gain (if positive) or yield loss (if negative) using soil applied insecticide vs the control. One dot represents one replicate within a trial. The yield differences are grouped by soil texture. The boxplot indicates the range of the yield change (%). The box plot from bottom to top includes: the lower whisker, 5th percentile; the bottom of the box, 25th percentile; the median % yield change, (the horizontal line within the box); the top of the box, 75th percentile; and the upper whisker, 95th percentile.

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### Key Results

Across all trials, treatments with Soil-Applied Insecticide (SAI) produced a yield response
of 2.5 bu/acre with a 90% Confidence Interval ranging from 1.2 to 3.7 bu/acre

### Break-Even Analysis

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### Key Results

Across all trials, treatments with Soil-Applied Insecticide (SAI) produced a yield
change of 1.5 % with a 90% Confidence Interval ranging from 0.7 to 2.4 %

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### Information

This graph shows the relationship between yield response and yield at control (bu/acre) across trials for different years.

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### Information

This graph shows the relationship between yield response and rainfall (inches) in individual trials.

The flatter the smoother line, the weaker the relationship. Rainfall had little effect on SAI performance.

The flatter the smoother line, the weaker the relationship. Rainfall had little effect on SAI performance.

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### Information

This graph shows the relationship between yield response and cumulative GDD (F)
across trials for different years.

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### Information

This graph shows the relationship between the average root weight difference
and weather variables (cumulative growing degree days and cumulative rainfall).

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### Information

This graph shows the relationship between yield and the root weight.

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### Information

This graph shows the relationship between the root weight difference and the root
weight at the control (grams).

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### Information

One dot represents one replicate.
The root weight difference represents the root weight of the treated minus the root weight of the control.
The data are grouped by soil texture. The boxplot indicates the range of the root weight difference values.
The box plot includes five values (bottom to top): the minimum value, the 25th percentile, the median (the horizontal line),
the 75th percentile and the maximum value.

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### Information

One dot represents one replicate.
The root weight difference represents the root weight of the treated minus the root weight of the control.
The data are grouped by planting date. The boxplot indicates the range of the root weight difference values.
The box plot includes five values (bottom to top): the minimum value, the 25th percentile, the median (the horizontal line),
the 75th percentile and the maximum value.

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### Information

This graph shows the relationship between the average difference in root injury
and weather variables (cumulative growing degree days and cumulative rainfall).

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### Information

This graph shows the relationship between yield and the root injury.

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### Information

This graph shows the relationship between the root injury difference and the root
injury at the control.

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### Information

One dot represents one replicate.
The root injury difference represents the root injury of the treated minus the root injury of the control.
The data are grouped by soil texture. The boxplot indicates the range of the root injury values.
The box plot includes five values (bottom to top): the minimum value, the 25th percentile, the median (the horizontal line),
the 75th percentile and the maximum value.

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### Information

One dot represents one replicate.
The root injury difference represents the root injury of the treated minus the root injury of the control.
The data are grouped by planting date. The boxplot indicates the range of the root injury difference values.
The box plot includes five values (bottom to top): the minimum value, the 25th percentile, the median (the horizontal line),
the 75th percentile and the maximum value.

### Conclusions

- Across all years between 2008 and 2015, soil-applied insecticide increased yield on corn by an average of 2.5 bu/acre, with a 90% confidence interval ranging from 1.2 to 3.7 bu/acre
- Out 36 trials corn after corn, 13 trials had a significant yield response to soil applied insecticide at 90% confidence level.
- Yield responses were higher during the dry year of 2012: plants that were damaged by corn root worms had higher yield loss.
- Yield responses to soil-applied insecticide were slightly higher in low yielding and moisture stressed conditions.