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Published online 9 January 2007
Published in J Environ Qual 36:324-332 (2007)
DOI: 10.2134/jeq2006.0213
© 2007 American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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A Model for Phosphorus Transformation and Runoff Loss for Surface-Applied Manures

P. A. Vadasa,*, W. J. Gburekb, A. N. Sharpleyb, P. J. A. Kleinmanb, P. A. Moore, Jr.c, M. L. Cabrerad and R. D. Harmele

a USDA-ARS, U.S. Dairy Forage Research Center, 1925 Linden Drive West, Madison, WI 53706
b USDA-ARS, Pasture Systems and Watershed Management Research Unit, Building 3702, Curtin Road, University Park, PA 16802-3702
c USDA-ARS, Poultry Production and Product Safety Research Unit, Plant Sciences 115, Fayetteville, AR 72701
d Dep. Crop and Soil Sciences, Univ. of Georgia, Athens, GA 30602
e USDA-ARS, Grassland, Soil, and Water Research Lab., 808 E. Blackland Rd., Temple, TX 76502


Figure 1
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  		Fig. 1. Schematic depiction of manure and soil P pools, and pathways of P transformation between the pools.

 

Figure 2
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  		Fig. 2. Measured and simulated results for (a) soil labile P, (b) manure dry matter, and (c) dissolved inorganic P in runoff data from the Pennsylvania and Texas field sites of Vadas et al. (2006a).

 

Figure 3
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  		Fig. 3. Measured and simulated results for (a) manure total P, (b) manure WEPI, and (c) manure WEPO data from the Pennsylvania and Texas field sites of Vadas et al. (2006a).

 

Figure 4
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  		Fig. 4. Measured and simulated results for (a) soil labile P, (b) poultry manure WEPI, and (c) poultry manure WEPO data from a Georgia field site of Tasistro et al. (2004).

 

Figure 5
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  		Fig. 5. Measured and simulated results for (a) cumulative P loads in runoff (kg ha–1) and (b) storm event dissolved inorganic P concentrations in runoff (mg L–1) data from the Arkansas and Georgia field studies of Edwards et al. (1996) and Pierson et al. (2001a).

 

Figure 6
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  		Fig. 6. Measured and simulated results for soil labile P data from the Arkansas and Georgia field studies of Edwards et al. (1996) and Pierson et al. (2001a).

 




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