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Fig. 4. The relationships between runoff dissolved reactive P and (A) phosphorus saturation index calculated with acid ammonium oxalate–extractable data (PSI_ox), (B) a phosphorus saturation index calculated with Mehlich-3 P and S_max (P_sat), and (C) a phosphorus saturation index calculated with water-soluble P and S_max (PSI_WSP) for the three study soils. ***Significant at the 0.001 probability level.