According to University of Illinois assistant professor of crop sciences Fabián Fernández, most of the nitrogen applied last fall is probably still in the soil. However, some fields are showing what appears to be a nutrient-deficient crop.
He said that, at the end of February, most of the nitrogen was still present, mainly in the ammonium form, in fields in central Illinois that received a late November application of 150 lb. of nitrogen per acre with NServe.
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