Recent research has provided new information that can be used to address spatial variability in soil nitrate concentrations in Iowa cornfields in late spring. Following is a summary of observations made and some tips for sampling fields this spring. The tips focus on efficient sampling techniques for farmers having several fields that are managed similarly and separated by only a few miles. The information given herein expands on guidelines given in Iowa State University Extension publication Pm 1714, Nitrogen Fertilizer Recommendations for Corn in Iowa.
Iowa State University
Blackmer, Alfred M., "Sampling fields for nitrate in late spring" (1998). Integrated Crop Management News. 2286.
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