The University of Minnesota Supplemental Fertilizer N Worksheet was developed as a simple, quick, reliable, and inexpensive alternative decision aid tool to assess potential fertilizer N losses. The worksheet is a series of three questions with multiple-choice answers. Depending on the answers, numbers are assigned for each question that are summed, and then the recommendation is made for supplemental N applications. It has been used with success for 10 years in Minnesota as a decision aid as well as an educational tool regarding fertilizer N management strategies.
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Schmitt, M. A., Randall, G. W., Lamb, J. A., & Rehm, G. W. (2005). The University of Minnesota Supplemental Fertilizer Nitrogen Worksheet. The Journal of Extension, 43(3), Article 26. https://tigerprints.clemson.edu/joe/vol43/iss3/26