The equation for calculating Iowa’s Corn Suitability Ratings (CSR) was recently updated and designated Corn Suitability Rating 2 (CSR2). The updated equation provides every user an opportunity to calculate the rating for each soil map unit identified in Iowa. Corn Suitability Rating 2 remains an index to the inherent soil productivity of each kind of soil for row crop production. The index is scaled from 100, for the most productive soils, to 5 as the least productive.
Iowa State University
Miller, Gerald A. and Burras, C. Lee, "Corn Suitability Rating 2 Equation Updated" (2015). Integrated Crop Management News. 326.
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