Nitrogen fertilizer is among the most critical inputs to crop productivity – and one of the costliest. When applied at the optimum rate, nitrogen boosts productivity and profitability while minimizing losses to the environment. However, the optimum rate is incredibly difficult to forecast and can vary by more than 100% from field-to-field and year-to-year.
Current nitrogen fertilizer recommendations do not address factors that contribute to this variability, such as weather or the multitude of decisions farmers must make each year like seed selection and soil management.
Participation and collaboration with Iowa farmers through the on-farm trials will make this project a success. Approximately 150 preliminary trials were conducted in 2022 and researchers seek to increase this number to over 400 for 2023.
Participating in the nitrogen trials is easy. Farmers commit to reserving a small portion of their farm field (four to seven acres) for a personalized variable rate nitrogen prescription. All other farming decisions, including the nitrogen application for the rest of the field, remain with the farmer.
“My farm participates in the Iowa Nitrogen Initiative trials, because I want to better understand the science behind what my corn crop needs and how I can improve water quality,” said Roger Zylstra who farms in Jasper County and chairs the Iowa Nutrient Research & Education Council. “Participation is easy since we already use yield monitors and variable rate nitrogen application.”
Researchers are seeking the help of Iowa farmers to meet their goal of 400 trials in 2023. The Iowa Nitrogen Initiative’s network of farmer participants enables researchers to gather data on real-world scenarios, develop decision support tools with input from the people who will use them, and return information to farmers about optimum rates on their farms. The trials can be included in any Iowa corn field – regardless of the management.
Source : iastate.edu