ISA aggregates the data collected from on-farm research to create tools to help farmers make more informed decisions.


On-line Strip Trial 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. 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.

Click here to access the On-line Strip Trial Tool

Nitrogen Risk Calculator

Every year farmers play a game of risk with Nitrogen (N) management. Quantifying the risk of yield loss when a corn field becomes deficient in N fertilizer for a specific field is difficult because outcomes are dependent upon many factors. Farmers across Iowa use several N management practices that differ in N form, timing, application method and rate of application, as well as differences in crop rotation, soil and topography of their landscape, including differing rainfall patterns. Our Late-Season Nitrogen Deficiency Risk Calculator uses real-time May-June rainfall data from the Iowa Environmental Mesonet at ISU to spatially calculate the probability of N deficiency on your field, while taking crop rotation, N form, rate and timing into account.  Try it out now!

Click here to access the Nitrogen Risk Calculator

Fungicide Calculator

The On-Farm Network and Environmental Programs and Services have been conducting annual surveys of corn nitrogen status using late-season aerial imagery and corn stalk nitrate tests. When possible, the sampling locations are paired with water monitoring to maximize the benefits to farmers. The results from individual locations are available in the online database.

Click here to access the Fungicide Calculator

Within-Field Profitability Assessment

Through profitability mapping, producers can better understand the performance of their operation by pinpointing the strengths and weaknesses of each field. Using yield data, variable and fixed input costs, management information, weather data and commodity prices, farmers can identify which areas are the most and least profitable. Farmers can use this information to optimize profit by identifying alternatives for underperforming areas and maximizing profitable areas.

Remote Sensing

Various remote sensing tools such as crop and soil sensing, aerial, satellite and unmanned vehicle imagery are used in agronomic and environmental studies. These data and imagery help to quantify field management problems, guide soil and tissue sampling, diagnose plant nutrient status, facilitate environmental planning, and identify within-field areas affected by disease, weeds and pests.

Click here to access Remote Sensing

Guide to Replicated Strip Trials

The most recent publication of ISA’s On-Farm Network, this guide is designed to help farmers, agronomists, researchers and consultants interested in on-farm research. It provides practical information about how to set up on-farm replicated strip trials, collect quality data, summarize results and make management decisions.


Water Quality Lab

In 2011, ISA began analyzing water samples in its accredited water lab. The lab is certified by the EPA through the Iowa Department of Natural Resources to analyze E. coli, nitrate, nitrite and fluoride under the Safe Drinking Water Act. Ion chromatography is used for the common nutrients of nitrate, nitrite and phosphate as well as fluoride, chloride and sulfate. E. coli bacteria are quantified using the IDEXX Quanti-Tray® most probable number method.

Other tests conducted in the lab as needed include turbidity (a measure of water clarity), alkalinity and hardness as well as ammonia nitrogen. The lab is routinely audited and uses third party proficiency testing to assure accurate operation. Tile water sampling results are sent to growers periodically, and stream and tile sample results are summarized and posted regularly.


SoilWeb is a quick and convenient way for accessing NRCS Soil Survey data. SoilWeb was developed by the California Soil Resource Lab at the University of California Davis and University of California-Agriculture and Natural Resources in collaboration with the USDA Natural Resources Conservation Service.

Click here to access SoilWeb