LABILE POOLS AND DISTRIBUTION COEFFICIENTS FOR SOIL CALCIUM MAGNESIUM, AND POTASSIUM DETERMINED WITH EXCHANGE EQUILIBRIA AND RADIOISOTOPES

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Abstract
Ten Missouri [USA] soils selected at random were studied in relation to their exchange capacity of cations and pools of Ca, Mg, K and H-Al. A relationship between the percentage of an ion in solution and pool (me/100 g) will change slope with increasing CEC [cation exchange capacity]. This will allow for the rapid determination of labile pools for ions of interest once the CEC and the percentage of ion in solution were determined. The percentage of an ion in solution may be calculated into a diffusion coefficient (Kd) from which an estimate of the rate of diffusion of an ion in a soil may be obtained. This results in a quantitative expression of intensity values. By using exchange and exchange equilibria, less time is spent determining the 4 pools and distribution coefficients. This method is more efficient for purposes of routine soil testing and it greatly improves the chemical data used to predict soil-plant relationships.

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