SDSU Nitrogen Trials Aim to Improve Corn Yields

By Scout Nelson

South Dakota State University Extension, working with Premier Crop Systems, invites corn farmers to take part in nitrogen fertilizer trials. The goal of this effort is to improve nitrogen management recommendations and help farmers make better fertilizer decisions on their farms.

Jason Clark, SDSU Extension Soil Fertility Specialist, explains that the research focuses on improving nitrogen rates that are recommended for corn production. Farmers who join the trials can help shape future nitrogen guidelines while learning more about how nitrogen works in their own fields and across the state.

“Research in accurate nitrogen rate recommendations is needed because excessive nitrogen fertilizer applications can reduce fertilizer efficiency, create environmental contamination issues, and reduce grower profits,” Clark said.

The trials use a system called Enhanced Learning BlocksTM. These blocks allow different nitrogen application rates to be tested within a farmers field. This approach helps compare how crops respond to various nitrogen levels under real farming conditions. Trial areas range from 2 to 5 acres, depending on equipment size and field layout.

All data collected during the trials stay confidential. Information is tied to specific locations and farms but is protected to respect farmer privacy. Results are used in a general way to improve nitrogen recommendations across South Dakota.

Nitrogen is a key nutrient for plant growth. While some nitrogen is already present in soil, corn crops often need additional nitrogen supplied through fertilizer. Each year, corn plants may be used between 98 and 250 pounds of nitrogen per acre, depending on conditions.

Applying the right amount of nitrogen is important. Proper rates help improve yields, increase farm profits, and reduce harm to soil and water. Too much nitrogen can lower efficiency and increase environmental risks.

Farmers interested in learning more or joining the trials, email Jason.D.Clark@sdstate.edu.

Existing nitrogen guidance is also available through the SDSU Extension Fertilizer Recommendation Guide, which provides science-based support for fertilizer decisions.

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