Northeast Research and Demonstration Farm
Information on phosphorus (P) loss from surface runoff in fields managed with different cropping and P management systems is scarce. Swine manure can supply nitrogen (N), P, and K (potassium) for crops. Continued use of N-based manure rates can result in P buildup in the soil, mainly in continuous corn or when manure is applied for both corn and soybean production. Excessive soil P and P applications increase the risk of P loss from fields and of water quality impairment.
Iowa State University
Mallarino, Antonio P.; Haq, Mazhar Ul; and Pecinovsky, Kenneth T., "Runoff Phosphorus Loss as Affected by Tillage, Fertilizer, and Swine Manure Phosphorus Management in Corn-Soybean Production Systems" (2005). Iowa State Research Farm Progress Reports. 1247.