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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.
