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Fig. 1. Relationship between water-extractable phosphorus (PH2O) and degree of phosphorus saturation estimated as the ratio of either Olsen (POls) or Mehlich 3 (PM3)–extractable P to P sorption indices. CaM3, Mehlich 3–extractable Ca; (Ca + Mg)M3, the sum of Mehlich 3–extractable Ca and Mg; P150, P sorption index at 150 mg L–1 of added P; ESmax, estimated Langmuir adsorption. All relationships are significant at p < 0.01 (n = 112). Three points with PH2O values of 0.9, 1.1, and 2.3 mmol kg–1 were statistically shown to be outliers and were eliminated from the regression plot.
