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Soil and Surface Runoff Phosphorus Relationships for Five Typical USA Midwest Soils

Department of Agronomy, Iowa State University, Ames, IA 50011

View larger version (30K): [in a new window]   Fig. 1. Effect of P application rate on soil P measured by three routine soil tests. Curvilinear trends are shown only when the quadratic term was significant (P < 0.05) after a linear term. Different letters by the soil names indicate significantly different linear coefficients between soils for each soil test.

View larger version (31K): [in a new window]   Fig. 2. Effect of P application rate on soil total P and P measured by two environmental soil tests. Curvilinear trends are shown only when the quadratic term was significant (P < 0.05) after a linear term. Different letters by the soil names indicate significantly different linear coefficients between soils for each soil test.

View larger version (31K): [in a new window]   Fig. 3. Effect of P application on three soil P saturation indices: degree of P saturation based on soil test P and a P sorption index (Degree of P SaturationSTP), based on Mehlich-3 P (Degree of P SaturationM3), and based on ammonium-oxalate P (Degree of P SaturationOX). Degree of P SaturationSTP is shown only for the Olsen P soil test. Curvilinear trends are shown only when the quadratic term was significant (P < 0.05) after a linear term. Different letters by the soil names indicate significantly different linear coefficients between soils for each index.

View larger version (28K): [in a new window]   Fig. 4. Effect of P application on runoff P concentration. Different letters by the soil names indicate significantly different (P < 0.05) linear coefficients between soils for each runoff P fraction.

View larger version (25K): [in a new window]   Fig. 5. Relationship between soil-test P and dissolved reactive P in runoff. Different letters by the soil names indicate significantly different (P < 0.05) linear coefficients between soils for each soil test.

View larger version (26K): [in a new window]   Fig. 6. Relationship between soil-test P and bioavailable P concentration in runoff. Different letters by the soil names indicate significantly different (P < 0.05) linear coefficients between soils for each soil test.

View larger version (26K): [in a new window]   Fig. 7. Relationships between dissolved reactive P concentration in runoff and three soil P saturation indices: degree of P saturation based on soil test P and a P sorption index (Degree of P SaturationSTP), based on Mehlich-3 P (Degree of P SaturationM3), and based on ammonium-oxalate P (Degree of P SaturationOX). Degree of P Saturation STP is shown only for the Olsen P soil test. Curvilinear trends are shown only when the quadratic term was significant (P < 0.05) after a linear term. Different letters by the soil names indicate significantly different linear coefficients between soils for each index.