Effects of soil properties on phosphate sorption

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Abstract
The effects of chemical and physical properties of surface and subsurface soils of a temperate region on P sorption from solutions containing various concentrations of P was studied. Na2S2O4 extractable Fe and Al of surface soils were significantly correlated with sorption from a solution containing 10, 15 or 20 ppm P. The relationships between the amounts of P sorbed and the other properties of the surface and subsurface soils studied (e.g., pH, organic C, soluble P, and CEC [cation exchange capacity]) were influenced by use of 0.01M CaCl2 as an equilibrating solution. The values of P adsorption maxima calculated from soil-water systems were from 1.2 to 2.1-fold higher than those calculated from soil 0.01M CaCl2 systems. Langmuir adsorption constants calculated from results obtained in the presence of CaCl2 were from 7-to 27-fold higher than those in the absence of salt.