Phosphate retention in some tropical soils in relation to soil taxonomic classes

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Abstract
Phosphate sorption values were correlated with other properties, the most important factor related to P retention seems to be extractable Al, free Fe oxides also play a significant role in the process of sorption. Clay content affects P-sorption but only at a low level of significance. When adsorption was studied in relation to soil classes, it was found that there is a great variability in oxisols, and within them the oxisol with hardened laterite presented the lowest sorbing power. All the ultisols studied had low P-retention. The vertisols presented moderate to high P-retention characteristics. In general, the entisols present the lowest P-sorption in tropical soils. Only 2 alfisols (with a low capacity to sorb phosphate) were included, making any comparison difficult. The only inceptisol examined showed a high P-sorption capacity.

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