Submitted to: American Society of Agronomy Meetings
Publication Type: Abstract Only
Publication Acceptance Date: November 6, 2003
Publication Date: November 6, 2003
Citation: MA, L., MALONE, R.W., ANAPALLI, S.A., MEADE, T.G., KANWAR, R.S., KARLEN, D.L., HATFIELD, J.L., AHUJA, L.R. SIMULATING SWINE MANURE EFFECTS ON N LEACHING AND CROP PRODUCTION. CD-ROM. MADISON, WI. AMERICAN SOCIETY OF AGRONOMY MEETINGS. 2003.
Disposal of animal waste in agricultural land is beneficial if the rate and timing of application are appropriate. A model that accurately simulates soil C/N cycling, nitrate leaching, and crop yield could help evaluate and optimize this system. A study was conducted in Nashua, IA to evaluate the effects of manure application on crop production (corn and soybean) and environmental quality (nitrate in tile flow). Thirty-six one-acre plots with tile-drains were established in 1979 and extensive measurements of soil water quality and crop production were initiated in 1990. Swine manure as a treatment was included in 1993. Manure was applied either alone with application rates determined from crop N or P demands or in combination with inorganic fertilizer. Crop yield, N uptake, and nitrate-N in tile flow were measured. The USDA-ARS Root Zone Water Quality Model (RZWQM) was used to simulate swine manure management effects on crop production and nitrate leaching into the tile flow in comparison with inorganic fertilizer applications.