Northeast Research and Demonstration Farm
Swine manure and fertilizer can be used to supply the nitrogen (N) and phosphorus (P) needs of crops. Excess P application sometimes applied with N-based manure for corn increases the risk of P loss and water quality impairment. Poor water quality in Iowa streams and lakes due to excess P has prompted questions about the impact of cropping and nutrient management systems on P loss from fields.
Iowa State University
Haq, Mazhar Ul; Mallarino, Antonio P.; Pederson, Carl H.; Helmers, Matthew J.; Kanwar, Rameshwar S.; and Pecinovsky, Kenneth T., "Fertilizer and Swine Manure Management Systems Impacts on Phosphorus in Soil and Subsurface Tile Drainage" (2012). Iowa State Research Farm Progress Reports. 79.