Fig. 3. Relationships between Mehlich 3 and acid ammonium oxalate extractable (a) P, (b) Al, and (c) Fe, for all 465 soils used in the study. Correlation coefficients in each graph are based on the entire data set.
Fig. 3. Relationships between Mehlich 3 and acid ammonium oxalate extractable (a) P, (b) Al, and (c) Fe, for all 465 soils used in the study. Correlation coefficients in each graph are based on the entire data set.