Use of the End-of-Season Corn Stalk Nitrate Test in Iowa Corn Production
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Abstract
Nitrogen (N) application is typically required for optimal corn yield and profitability. Rate selection is important, and can affect achieving both of those goals. There are in-season tests that can aid in N rate adjustment, such as soil nitrate testing and crop canopy sensing. An end-of-season test such as the corn stalk nitrate test (CSNT) cannot provide information for in-season rate adjustment, but instead provides information on N supply for the season that just ended. Research has shown that the concentration of nitrate in the lower corn stalk relates to N available to corn during the season.