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Relating Soil Phosphorus to Dissolved Phosphorus in Runoff

A Single Extraction Coefficient for Water Quality Modeling

^a USDA-ARS, Pasture Systems and Watershed Management Research Unit, Building 3702, Curtin Road, University Park, PA 16802-3702
^b Soil and Water Science Department, University of Florida, 106 Newell Hall, P.O. Box 110510, Gainesville, FL 32611

View larger version (25K): [in a new window]   Fig. 1. Relationship between Mehlich 3– or Bray 1–extractable soil P and runoff filterable reactive phosphorus (FRP) for (a) the soil box studies of Fang et al. (2002), Kleinman and Sharpley (2003), Kleinman et al. (2002), Kleinman et al. (2004), McDowell and Sharpley (2001a), and Weld et al. (2001), and (b) the field-plot studies of Andraski and Bundy (2003), Andraski et al. (2003), Cox and Hendricks (2000), Daverede et al. (2003), Sharpley et al. (2001), and Turner et al. (2004) using tilled and no-till field plots.

View larger version (28K): [in a new window]   Fig. 2. Relationship between Mehlich 3–extractable soil P and runoff filterable reactive phosphorus (FRP) for the grassed field-plot studies of (a) Pote et al. (1999a)(1999b; May experiments), Schroeder et al. (2004), and Torbert et al. (2002), and of (b) Pote et al. (1996)(1999a; August experiments).

View larger version (35K): [in a new window]   Fig. 3. Relationship between Mehlich 3– or Bray 1–extractable soil P and runoff filterable reactive phosphorus (FRP) for all studies using soil boxes, and tilled, no-till, and grassed field plots where extraction coefficients are not significantly different. Data are from Andraski and Bundy (2003), Andraski et al. (2003), Cox and Hendricks (2000), Daverede et al. (2003), Kleinman and Sharpley (2003), Kleinman et al. (2002)(2004), McDowell and Sharpley (2001a), Pote et al. (1996)(1999a, 1999b), Schroeder et al. (2004), Sharpley et al. (2001), Torbert et al. (2002), Turner et al. (2004), and Weld et al. (2001).

View larger version (35K): [in a new window]   Fig. 4. Relationship between (a) water-extractable soil P and runoff filterable reactive phosphorus (FRP) from soil box and grassed and cropped field-plot studies of Aase et al. (2001), Andraski and Bundy (2003), Andraski et al. (2003), Daverede et al. (2003), Pote et al. (1996)(1999a, 1999b), Schroeder et al. (2004), and Torbert et al. (2002) where extraction coefficients did not differ significantly. Data from Pote et al. (1999a)(August experiments) are presented separately for clarity. Relationship between (b) soil P sorption saturation and dissolved P in runoff from soil box and grassed and cropped field plot studies of Andraski and Bundy (2003), Andraski et al. (2003), Kleinman and Sharpley (2003), Kleinman et al. (2002)(2004), Pote et al. (1996)(1999b), and Schroeder et al. (2004).

View larger version (22K): [in a new window]   Fig. 5. Relationship between runoff dissolved P (µg L–1) as predicted from water-extractable soil P and the equation in Fig. 4a or from Mehlich-3 soil P and the equation in Fig. 3. Soil P data are from Andraski and Bundy (2003), Andraski et al. (2003), Daverede et al. (2003), Pote et al. (1999b)(Noark soil omitted), Schroeder et al. (2004), and Torbert et al. (2002).