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Adsorption of Phosphate and Water-extractable Soil Organic Material by Synthetic Aluminum Silicates and Acid Soils¹

ABSTRACT

Three synthetic Al silicates with different Si/Al ratios and soil samples from a Eutrandept, a Paleudult, and a Haplaquod, were separately treated with P and hot water-extractable soil organic materials. The Al silicate with the lowest Si/Al ratio retained the most P but the least organic materials. The Paleudult which had a lower P adsorption capacity retained more organic matter than the Eutrandept. The Haplaquod had the lowest P and organic matter retention.

Pretreatment of soils with organic material had varied effects on subsequent P adsorption. Pretreatment of soils with P reduced the adsorption of organic material, but at all organic matter levels the P adsorption was constant.

The findings suggested that the sites for organic matter and P adsorption may differ, but certain sites seem to adsorb both P and organic matter.

¹ Florida Agric. Exp. Stn. Journal Series Paper no. 1725.

² Professor (Chemist), Dep. of Soil Science, Univ. of Florida, Gainesville, FL 32611.

Received for publication March 26, 1979. Accepted for publication April 21, 1980.

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