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Soil Testing to Predict Phosphorus Leaching

Department of Plant and Soil Sci., Univ. of Delaware, Newark, DE 19717-1303

View larger version (31K): [in a new window]   Fig. 1. Comparison of the concentration of dissolved reactive phosphorus (DRP) in the second leaching event from the intact soil columns and the environmental soil tests (a) iron-strip phosphorus (FeO-P), (b) water-soluble phosphorus (WSP), and (c) 0.01 M CaCl2–extractable P (CaCl2–P).

View larger version (34K): [in a new window]   Fig. 2. Comparison of the concentration of dissolved reactive phosphorus (DRP) in the second leaching event from the intact soil columns and the agronomic soil tests (a) Mehlich-1 P, (b) Mehlich-3 P (with the agronomic optimum range of 50 to 100 mg P kg-1 indicated by vertical lines; Sims et al., 2001), and (c) the Mehlich-3 P saturation ratio.