Fig. 4. Relationships between (a) Mehlich 3 [P/(Al+Fe)] and degree of P saturation via the oxalate method (DPSox) and (b) Mehlich 3 (P/Al) and Mehlich 3 [P/(Al+Fe)] for all 465 soils used in the study.
Fig. 4. Relationships between (a) Mehlich 3 [P/(Al+Fe)] and degree of P saturation via the oxalate method (DPSox) and (b) Mehlich 3 (P/Al) and Mehlich 3 [P/(Al+Fe)] for all 465 soils used in the study.