PHOSPHATE RETENTION IN DIFFERENT SOIL TAXONOMIC CLASSES

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Abstract
We estimated the phosphate sorptivity of 290 samples (topsoil and subsoil) from 9 orders and 26 great groups of the Soil Taxonomy, in terms of the Bache and Williams index. Among these samples, entisols, alfisols, mollisols, and ultisols generally had lower than average sorption indices, and vertisols higher than average. Samples from histosols, inceptisols, oxisols, and spodosols varied greatly in sorption index, but there is usually an explanation for this variation in terms of a property or properties considered at the family level of the Soil Taxonomy. Some statistical evidence is given to show that the variation in sorption index within soil series is usually considerably less than the variation in a more diverse collection of soil samples. We estimated the phosphate sorptivity of 290 samples (topsoil and subsoil) from 9 orders and 26 great groups of the Soil Taxonomy, in terms of the Bache and Williams index. Among these samples, entisols, alfisols, mollisols, and ultisols generally had lower than average sorption indices, and vertisols higher than average. Samples from histosols, inceptisols, oxisols, and spodosols varied greatly in sorption index, but there is usually an explanation for this variation in terms of a property or properties considered at the family level of the Soil Taxonomy. Some statistical evidence is given to show that the variation in sorption index within soil series is usually considerably less than the variation in a more diverse collection of soil samples. © Williams & Wilkins 1982. All Rights Reserved.

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