Wortmann, C.S. and D.T. Walters. 2007. Residual effects of compost and plowing on phosphorus and sediment in runoff. J. Envir. Qual. 36:1521-1527 [view and download PDF of full paper]

Wortmann, C.S., D. Namuth, and D. Tarkalson. 2006. Manure phosphorus (p) and surface water protection. I: manure P, soil P and water P dynamics and interactions. JNRLSE [To Be Posted]

Wortmann, C.S. and D.T. Walters. 2006. Phosphorus runoff during four years following composted manure application. J. Environ. Qual. 35: 651-657. [view and download PDF of full paper]

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. [view and download PDF of full paper]

Benning, J.L. and C.S. Wortmann, 2005. Phosphorus indexes in four Midwestern States: an evaluation of the differences and similarities. J. of Soil and Water Conservation. 60:221-227. [view and download PDF of full paper]

Tarkalson, D.D. and R.L. Mikkelsen. 2004. Runoff phosphorus losses as related to phosphorus source, application method, and application rate on a Piedmont soil. J. Environ. Qual. 33:1424-1430. [view and download PDF of full paper]