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Summary Parameters of the exchange equilibria for three pairs of cations of agricultural interest (K/NH4 – Ca/Mg – K/Ca) were experimentally determined. The selectivity coefficient of the two homovalent pairs was found to be constant, whereas that of the mono‐divalent pair depended on the total concentration of cations in the solution and on the exchange capacity. Equations are given which describe the exchange equilibria in peat, which take into account its pH‐dependent exchange capacity.
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André et al. (1977) studied this question.
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