The MRNT Calculator web site provides a method to calculate the return to N application and to find the maximum return to N (MRTN) at selected prices of N and corn directly from recent research data. The MRTN approach is the regional approach suggested for developing corn N rate guidelines in individual states. Nitrogen rate trial data is provided in this web site for six states (Illinois, Iowa, Michigan, Minnesota, Ohio, and Wisconsin) where an adequate number of research trials (sites) were available for corn following soybean and corn following corn. These trials were conducted with spring, sidedress, or split preplant/sidedress applied N, and sites were not irrigated (except for those as indicated for irrigated sands in Wisconsin).

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