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Abstract
The effect of applying limestone and/or gypsum to a Palexerult soil, either alone or in mixtures at rates covering a broad range (1.25–15t ha−1), on phosphorus (P) adsorption was studied. In subsurface horizons, the P adsorption index (Ibw) decreases with increasing soil pH up to 6.0 –6.5, but above 6.5, the trend is reversed. The surface horizon exhibits a similar behavior above pH 6.0; however, Ibw does not vary with pH at lower levels, possibly as a result of mineralization and changes in humic components after treatment. Sulphate and phosphate anions were found to compete for adsorption sites at acid pH in all the samples.
ACKNOWLEDGMENTS
The authors wish to thank Spain's MAPA for funding this research through their project number SC95-075-C2-2.