The late-spring soil test for nitrate has been identified as a promising tool for improving nitrogen (N) management in Iowa. The test works by measuring the amount of nitrate iiv the top one-foot layer of soil when corn plants are 6 to 12 inches tall. Sampling is done as late as possible in the spring, but still early enough to allow sidedress applications of more fertilizer N if needed.
Alfred M. Blackmer
Year of Grant Completion
Blackmer, Alfred M., "Operating procedures for use of the late-spring soil test by fertilizer dealers and consultants in Iowa" (1993). Leopold Center Completed Grant Reports. 7.