Soybean is a legume that via a symbiotic relationship with Bradyrhizobium japonicum, a nitrogen-fixing bacteria, obtains from 50-75% of its nitrogen requirements from the air. Additional nitrogen needed to maximize production is supplied from: 1) Soil residual nitrogen and 2) Nitrogen supplied via mineralization during the growing season. University of Maryland Extension currently recommends that no additional nitrogen be supplied to soybean. This recommendation has recently come in conflict with MDA's Nutrient Management Program which has vacillated on a proposed regulation to ban a manure application to a field where soybean was to be the next crop. Farmers with limited storage capacity...
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#soil fertility