Farm Progress is part of the Informa Markets Division of Informa PLC

This site is operated by a business or businesses owned by Informa PLC and all copyright resides with them. Informa PLC's registered office is 5 Howick Place, London SW1P 1WG. Registered in England and Wales. Number 8860726.

Serving: IA
cornfield Farm Progress
HELPFUL INFORMATION: The ISU on-farm reports are annual ag research project updates and progress reports, and not necessarily final results.

On-farm trials: Opportunities for farmers

ISU cooperator demonstration program has a long-standing relationship with Iowa corn and soybean farmers.

The Iowa State University on-farm cooperator demonstration trial program has a long-standing relationship with Iowa corn and soybean farmers. This program provides support and assistance to farmers interested in setting up strip trials to test new ideas on their farms. Local ag specialists, associated with ISU research farms, assist cooperators in the design, implementation and analysis of the trial.  

The answers received from these trials give farmers a firsthand look at products and practices so they can make better decisions on their operations. In 2019, 36 farmer-cooperators in 24 counties assisted in conducting 91 on-farm trials. 

Results available yearly

On-farm trials focus on agronomic practices and products, farm management studies, and mechanical approaches to help farmers improve their operations. These trials are conducted by farmer cooperators on their own farms or through ISU Research farms and associations. Test strips have varying sizes that meet individual farmer’s equipment and have at least three replications per treatment. 

The results from all ISU on-farm demonstration trials are reported every year in the ISU Research farm reports at the ISU digital repository. The trials and results are at ISU’s website

Sulfur trial good example 

An example of an ISU on-farm trials study from 2019 would be the application of the nutrient sulfur to both corn and soybeans. Sulfur deficiency has been showing up more frequently in Iowa cornfields in recent years. Studies have shown that yield responses are possible when fertilizing corn with sulfur. While deficiencies are more common in coarse or eroded soils, visual symptoms of sulfur deficiency can occur in all soil types.  

The objective of these trials was to evaluate potential yield response in corn and soybeans to sulfur applications. While only one trial in this study resulted in a significant yield response that we can be confident was related to the application of sulfur, results on your own farm may vary. Read more about Sulfur Management for Iowa Crop Production, CROP 3072

ISU and the on-farm trials program are committed to helping producers improve their farms by providing unbiased information to help make decisions. Farmers conducting on-farm trials and sharing results from many sites within a region provide a better understanding of how management decisions interact with weather and soil variability. 

This understanding can help improve profitability for all farmers across the state. If you want to learn more about ISU on-farm trials and on-farm trial results, or would like to create your own trial, contact a member of the on-farm team. You can also contact your local ISU field agronomist with questions about trials and information. 

ISU on-farm trials team

Members and contact information follow: 

Witt is the ISU Extension field agronomist covering west-central Iowa. 

Source: ISU, which is solely responsible for the information provided and is wholly owned by source. Informa Business Media and all of its subsidiaries are not responsible for any of the content contained in this information asset. 
Hide comments


  • Allowed HTML tags: <em> <strong> <blockquote> <br> <p>

Plain text

  • No HTML tags allowed.
  • Web page addresses and e-mail addresses turn into links automatically.
  • Lines and paragraphs break automatically.