General Information about the tool

ISOFAST is a web-based interactive tool to visualize and summarize historical on-farm replicated strip trial data conducted by farmers working with the Iowa Soybean Association. The tool’s capabilities for each study include:
• Describes on-farm study rationale, specifies trial locations, field management and weather.
• Shows dynamic graphics to better communicate statistical summaries, variability and uncertainty in yield differences within and across trials.
• Provides break-even economic analyses using cost and price inputs provided by users online.
• Summarizes key scouting, soil and tissue observations for tested treatments.
• Provides short summaries for aid in decision making for farmers and agronomists.

Process

Farmers apply treatments and collect yield observations using yield monitoring equipment and GPS. All the trials used have two treatments: treated and control. 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.

Disclaimer

The information contained in this website is for information purposes only. The information is provided by the Iowa Soybean Association and while we endeavor to keep the information up to date and correct, we make no representations or warranties of any kind, express or implied, about the completeness, accuracy, reliability, suitability or availability with respect to the website or the information, products, services, or related graphics contained on the website for any purpose. Any reliance you place on such information is therefore strictly at your own risk.

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.

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.

Conclusions

  1. 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.
  2. Across three years with a 90% confidence interval, Clariva nematicide treatments increased yield on average by 0.4 bu/acre, from -0.1 to 0.8 bu/acre.
  3. There was no significant difference in egg counts between the spring counts and the fall.
  4. Only three trials had SCN counts larger than 1,000 eggs per 100 cubic centimeters of soil
  5. Clariva slightly decreased SCN egg counts in a few trials.
  6. With soybeans at $10.00 per bushel and Clariva nematicide application at $18.00 per acre, the breakeven yield response is 1.8 bu/acre. The probability to exceed the breakeven is 0% and the average expected profit exceeding cost is $-14.13 per acre. Use the Economic Analysis button in the application to adjust for your current market price and application costs.

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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 (Poncho/Votivo) 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.

Conclusions

  1. 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.
  2. 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 .
  3. ILeVO significantly increased soybean yield in about 40% of trials, but the majority of the3se increases were relatively small.
  4. With soybeans at $10.00 per bushel and Ilevo application at $20.00 per acre, the breakeven yield response is 2.0 bu/acre. The probability to exceed the breakeven is 0% and the average expected profit exceeding cost is $-13.40 per acre. Use the Economic Analysis button in the application to adjust for your current market price and application costs.

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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.

Conclusions

  1. 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.
  2. 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.
  3. Responses to 15” row spacing tended to be greater when May-June rainfall was above average.
  4. 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.
  5. With soybeans at $10.00 per bushel and row spacing with no additional cost, the breakeven yield response is 0.0 bu/acre. The probability to exceed the breakeven is 82% and the average expected profit exceeding cost is $6.75 per acre. Use the Economic Analysis button in the application to adjust for your current market price and application costs.

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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 Headline (pyraclostrobin) 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 6.7% 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.

Conclusions

  1. 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.
  2. 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.
  3. With soybeans at $10.00 per bushel and foliar fungicide application at $20.00 per acre, the breakeven yield response is 2.0 bu/acre. The probability to exceed the breakeven is 100% and the average expected profit exceeding cost is $4.64 per acre. Use the Economic Analysis button in the application to adjust for your current market price and application costs.

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What was done

The objective of this study was to compare untreated strips to strips treated with Stratego foliar fungicide (propiconazole 11.4% - trifloxystrobin 11.4%) applications on soybean in field-scale on-farm trials across Iowa and identify when these applications produced profitable yield responses. Applications were done by farmers using ground sprayers.

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.

Conclusions

  1. Of the 29 Stratego foliar fungicide trials conducted on soybean between 2007, 2008, 2011, 2014 and 2015, 22 had significant yield response to foliar propiconazole - trifloxystrobin (Stratego) fungicide ranging from 1.5 to 3.3 bu/acre for individual trials.
  2. Across all years, foliar application of propiconazole - trifloxystrobin (Stratego) fungicide increased yield on average by 2.0 bu/acre, with a 90% confidence interval from 1.4 to 2.5 bu/acre.
  3. With soybeans at $10.00 per bushel and fungicide application at $15.00 per acre, the breakeven yield response is 1.5 bu/acre. The probability to exceed the breakeven is 93% and the average expected profit exceeding cost is $4.75 per acre. Use the Economic Analysis button in the application to adjust for your current market price and application costs.

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What was done

The objective of this study was to evaluate Stratego YLD foliar fungicide (prothioconazole 10.8% - Trifloxystrobin 32.3%) applications on soybean in field-scale on-farm trials across Iowa to study and identify when these applications produced profitable yield responses. Applications were done by farmers using ground sprayers.

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.

Conclusions

  1. Of the 37 foliar fungicide trials conducted on soybean in 2011, 2014 and 2015, All 37 had significant yield response to foliar Stratego YLD ranging from 1.3 to 1.6 bu/acre for individual trials.
  2. Across all years, foliar application of Stratego YLD fungicide increased yield on average by 1.5 bu/acre, with a 90% confidence interval from 1.1 to 1.9 bu/acre.
  3. With soybeans at $10.00 per bushel and fungicide application at $20.00 per acre, the breakeven yield response is 2.0 bu/acre. The probability to exceed the breakeven is 2% and the average expected profit exceeding cost is $-5.18 per acre.Use the Economic Analysis button in the application to adjust for your current market price and application costs.

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What was done

The objective of this study was to evaluate Quadris foliar fungicide (Azoxystrobin) applications on soybean in field-scale on-farm trials across Iowa. Applications were done by farmers using ground sprayers.

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.

Conclusions

  1. Of the 18 Quadris foliar fungicide trials conducted on soybean in 2007, 15 had significant yield response to foliar Quadris fungicide ranging from 1.3 to 10.0 bu/acre for individual trials.
  2. Across all years, foliar application of Quadris fungicide increased yield on average by 3.2 bu/acre, with a 90% confidence interval from 1.9 to 4.5 bu/acre.
  3. With soybeans at $10.00 per bushel and fungicide application at $12.50 per acre, the breakeven yield response is 1.2 bu/acre. The probability to exceed the breakeven is 100% and the average expected profit exceeding cost is $19.91 per acre. Use the Economic Analysis button in the application to adjust for your current market price and application costs.

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What was done

The objective of this study was to evaluate foliar fungicide, Delaro, (Prothioconazole, 16.00% and Trifloxystrobin 13.70%) applications on soybean in field-scale on-farm trials across Iowa. Applications were done by farmers using ground sprayers.

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.

Conclusions

  1. Of the 6 Delaro foliar fungicide trials conducted on soybean in 2018, 5 had significant yield response to Delaro fungicide ranging from 2.6 to 5.6 bu/acre for individual trials.
  2. Across all years, foliar application Delaro fungicide increased yield on average by 3.4 bu/acre, with a 90% confidence interval from 1.5 to 5.3 bu/acre.
  3. With soybeans at $10.00 per bushel and fungicide application at $20.00 per acre, the breakeven yield response is 2.0 bu/acre. The probability to exceed the breakeven is 88% and the average expected profit exceeding cost is $14.06 per acre. Use the Economic Analysis button in the application to adjust for your current market price and application costs.

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What was done

The objective of this study was to evaluate Domark foliar fungicide (Traconazole) applications on soybean in field-scale on-farm trials across Iowa. Applications were done by farmers using ground sprayers.

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.

Conclusions

  1. Of the 11 Domark foliar fungicide trials conducted on soybean between 2007 and 2009, 3 had significant yield response to foliar Domark fungicide ranging from 1.9 to 3.0 bu/acre for individual trials.
  2. Across all years, foliar application of Domark fungicide increased yield on average by 1.2 bu/acre, with a 90% confidence interval from 0.0 to 2.4 bu/acre. In 2007 with relatively dry spring and wet summer conditions, this product performed better than in 2008 when spring rainfall conditions were wet and the summer was relatively dry.
  3. With soybeans at $10.00 per bushel and fungicide application at $12.50 per acre, the breakeven yield response is 1.5 bu/acre. The probability to exceed the breakeven is 32% and the average expected profit exceeding cost is $-3.27 per acre. Use the Economic Analysis button in the application to adjust for your current market price and application costs.

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What was done

The objective of this study was to evaluate foliar FMC High Intensity applications on soybean in field-scale on-farm trials across Iowa. The key was to replace the pre-emerge application of glyphosate with Authority Assist herbicide. Additionally, Hero insecticide with Headline fungicide was applied later in the season rather than just insecticide.

“FMC High Intensity Treatment - Application 1: Authority Assist herbicide Sulfentrazone (33.33%) and Imazethapyr (6.67%). Application 2: Glyphosate with Ammonium Sulfate. Application 3: Headline (Pyraclostrobin) fungicide and Hero pyrethroid (bifenthrin 11.25% and zeta-cypermethrin 3.75 %) insecticide.

Control Treatment – Application 1: glyphosate with Ammonium Sulfate. Application 2: Glyphosate with Ammonium Sulfate. Application 3: Insecticide.

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.

Conclusions

  1. Compared with the control, in all 6 trials, High Intensity treatments applied on soybean in 2011 had significant yield response ranging from 2.8 to 3.4 bu/acre in individual trials.
  2. Across 6 trials, on average, yield response was 3.1 bu/acre, with a 90% confidence interval from 2.1 to 4.0 bu/acre.
  3. With soybeans at $10.00 per bushel and FMC High Intensity treatment applications at $22.00 per acre, the breakeven yield response is 2.2 bu/acre. The probability to exceed the breakeven is 94% and the average expected profit exceeding cost is $8.88 per acre.

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What was done

The objective of this study was to evaluate foliar Headline fungicide (Pyraclostrobin) & Lorsban insecticide (Chlorpyrifos) applications on soybean in field-scale on-farm trials across Iowa. Applications were done by farmers using ground sprayers.Weather conditions were unusually dry in May through July and unusually wet in August for trials in this study.

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.

Conclusions

  1. Of the 12 Headline & Lorsban foliar fungicide trials conducted on soybean in 2006 and one in 2012, 10 had significant yield response to foliar Headline & Lorsban fungicide with insecticide ranging from 1.5 to 7.6 bu/acre for individual trials.
  2. Across all years, foliar Headline & Lorsban fungicide with insecticide increased yield on average by 2.8 bu/acre, with a 90% confidence interval from 1.6 to 4.1 bu/acre. Yield response to Headline alone in 2006 was 2.0 bu/acre on average, so Lorsban may have added approximately 0.5 bu/acre to yield response.” With soybeans at $10.00 bu and fungicide & insecticide application at $18.00 per acre, the breakeven yield response is 1.8 bu/acre. The probability to exceed the breakeven is 91% and the average expected profit exceeding cost is $10.44 per acre. Use the Economic Analysis button in the application to adjust for your current market price and application costs.

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What was done

The objective of this study was to evaluate foliar Zolera fungicide (Tetraconazole) & Alpha Beta Pro (Harpin) applications on soybean in field-scale on-farm trials across Iowa. Harpins are proteins that bind to foliar receptors tricking plants into thinking they are under attack triggering vigor as a growth and/or resistance response. Applications were done by farmers using ground sprayers.

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.

Conclusions

  1. None of the 11 Zolera foliar fungicide & Alpha Beta Pro trials conducted on soybean in 2014 showed a significant yield response.
  2. Across all years, foliar application of Zolera foliar fungicide & Alpha Beta Pro decreased yield on average by -0.2 bu/acre, with a 90% confidence interval from -1.1 to 0.7 bu/acre.
  3. With soybeans at $10.00 per bushel and fungicide application at $22.50 per acre, the breakeven yield response is 2.2 bu/acre. The probability to exceed the breakeven is 0% and the average expected profit exceeding cost is $-24.52 per acre. Use the Economic Analysis button in the application to adjust for your current market price and application costs.

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What was done

The objective of this study was to evaluate foliar Zolera FX (Fluoxastrobin 17.76% and Tetraconazole 17.76%) applications on soybean in field-scale on-farm trials across Iowa. Applications were done by farmers using ground sprayers. 2016 had a dry June and wet summer.

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.

Conclusions

  1. 6 of the 7 Zolera FX foliar fungicide trials conducted on soybean in 2016 had significant yield response to foliar ranging from 1.1 to 1.4 bu/acre for individual trials.
  2. Across all years, foliar application of Zolera FX fungicide increased yield on average by 1.2 bu/acre, with a 90% confidence interval from 0.3 to 2.0 bu/acre.
  3. With soybeans at $10.00 per bushel and fungicide application at $20.00 per acre, the breakeven yield response is 2.0 bu/acre. The probability to exceed the breakeven is 6% and the average expected profit exceeding cost is $-8.13 per acre. Use the Economic Analysis button in the application to adjust for your current market price and application costs.

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What was done

The objective of this study was to evaluate Regalia RX foliar bio-fungicide (Extract of Reynoutria sachalinensis) applied with a foliar fungicide on soybean vs the foliar fungicide alone in field-scale on-farm trials across Iowa. Farmers used either Priaxor, Stratego or Aproach Prima fungicide as the control application and with Regalia RX as the treatment. Applications were done by farmers using ground sprayers.

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.