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Fig. 2. Phosphorus retention by the separated clay fractions of each soil type 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 clay fraction after four desorptions/P remaining on clay fraction after previous single point adsorption] x 100). Error bars indicate standard deviation. Least significant difference at P < 0.05 was 5.4 and 1.5 for adsorption and desorption, respectively.
