Wet springtime conditions typically raise questions about the status of applied nitrogen (N). Or the question, do I need to apply additional N to my cornfields? At this time we do not know what the weather/precipitation will be for the entire springtime, but the extended period of wet conditions this spring is of concern. A summary of long-term N rate trials with continuous corn and corn rotated with soybean conducted at seven ISU research and demonstration farms in Iowa from 1999 to 2016 has been an on-going basis for indicating the potential for needing an N rate greater than the MRTN rate suggested by the Corn Nitrogen Rate Calculator (CNRC). That is, a way (“tool”) to adjust applications when a greater than normal (MRTN) rate would be appropriate.
Iowa State University
Sawyer, John E., "Springtime Precipitation – A Tool for Estimating Nitrogen Application Need for Corn" (2019). Integrated Crop Management News. 2563.
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