Project title: Nutrient Management for Surface Water Quality Protection
Principal investigators: Charles Shapiro, Charles Wortmann
Duration: 2000 to 2008
Contact: Charles Wortmann, Department of Agronomy and Horticulture, UNL, 58C Filley Hall, Lincoln NE 68583-0951, (402) 472-2909 firstname.lastname@example.org
Various studies of the effects of manure application, with different management practices, on nutrient loss to surface water have been conducted.
Manure application was found to reduce runoff and erosion during the years of application and with a residual effect for up to eight years. Deep plowing in cases of extremely high P levels in the surface soil and use of grass filter areas occupying 1% of the drainage area were found to be effective in reducing runoff P loss. Non-application setbacks were not found to be effective in reducing runoff P loss.
Wortmann, C.S. and C.A. Shapiro. 2008. The effects of manure application on soil aggregation. J. Nutr. Cycling Agroecosystems 80:173-180.
Wortmann, C.S. and D.A. Walters. 2007. Residual effects of compost and plowing on phosphorus and sediment in runoff. J. Envir. Qual. 36:1521-1527.
Mamo, M., C. Wortmann, and S. Brubaker. 2007. Manure P Fractions: Analytical methods and the effect of manure types. Comm. Soil and Plant Anal. 38:935-947.
Wortmann, C.S. and D. Walters. 2006. Phosphorus runoff during four years following composted manure application. J. Environ. Qual. 35: 651-657.
Wortmann, C.S., M. Helmers, A. Mallarino, C. Barden, D. Devlin, G. Pierzynski, J. Lory, R. Massey, J. Holz, C. Shapiro, J. Kovar. 2006. Agricultural phosphorus management and water quality protection in the Midwest. RP 187. University of Nebraska-Lincoln Extension.