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Fig. 2. Estimated N inputs to and outputs from the 20-state region covering the Mississippi River basin used to (a) calculate net anthropogenic nitrogen input (NANI) and (b) estimate soil N mineralization resulting from conversion of hay and pasture to cropland, in addition to Committee on Natural Resources and Environment (CENR) estimates of net mineralization of soil organic N (mineralization - immobilization), crop senescence losses, and in-field denitrification.
