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Fig. 3. Phosphorus retention by whole soils expressed as the percentage of added P that was absorbed during a single point isotherm (adsorption). Desorption expressed as P retained on samples after four sequential desorptions with 0.01 M CaCl2 ([P remaining on soil after four desorptions/P remaining on soil after previous single point adsorption] x 100). Error bars indicate standard deviation. Least significant difference at P < 0.05 was 7.3 and 12.7 for adsorption and desorption, respectively.
