Effect of Phosphate on the Cation-Exchange Capacity of Minerals and Soils
1958
Perkins, Alfred T.
The cation-exchange capacity of several soil minerals and fertilizer compounds has been determined. The exchange capacity of iron and aluminum phosphates was found to be approximately the same as or somewhat greater than that of Wyoming bentonite. Phosphate treatment of several horizons of 4 different soils was found to increase the cation-exchange capacity of these soils but not in proportion to the amount of phosphate fixed, except in the case of the 6 horizons of the Summit soil. Eight soil clay minerals or minerals closely related to soil clays were decomposed by grinding and the effect of phosphate treatment on their exchange capacity was determined. In most cases a major increase in cation-exchange capacity resulted from phosphate treatment, but in several cases a lesser numerical but significant decrease occurred. It is concluded that phosphate fertilization can noticeably effect an increase in the cation-exchange capacity of soils.
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