SSSAJ -- Zhang et al. 69 (1): 96 Figure IG4

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Fig. 4. Relationships between a P saturation index calculated from Mehlich-3 extractable P and S_max (P_sat), and (A) a P saturation index calculated from acid ammonium oxalate extractable data (PSI_ox) for all 28 soils; (B) PSI_ox for soils with pH < 7.0; (C) a P saturation index calculated from Mehlich-3 extractable data (PSI_M3) for all 28 soils; or (D) PSI_M3 for soils with pH < 7.0. **p < 0.01.