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2003•Journal of the Indian Society of Soil ScienceOpen access

Effect of potassium saturation on different exchange selectivity coefficients in soils

S. C. Mehta, K. S. Grewal, A. K. Kapoor, R.D. Kaushik, Kuhad

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Abstract

Exchange equilibria of K+-Ca2+ was established on soils with different texture and organic matter content. The data on the composition of the equilibrium solution and the exchange complex were used to calculate some selectivity coefficients viz. Gapon (KG), Vanselow (KV), Krishnamoorthy Davis Overstreet (KKDO), KC and KN. None of these selectivity coefficients was constant at different levels of K-saturation. The values of selectivity coefficients were higher for higher organic matter content soil than low organic matter content soil.

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What this paper is about

Exchange equilibria of K+-Ca2+ was established on soils with different texture and organic matter content. The data on the composition of the equilibrium solution and the exchange complex were used to calculate some selectivity coefficients viz. Gapon (KG), Vanselow (KV), Krishnamoorthy Davis Overstreet (KKDO), KC and KN. None of these selectivity coefficients was constant at different levels of K-saturation. The values of selectivity coefficients were higher for higher organic matter content soil than low organic matter content soil.

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Available abstract

Exchange equilibria of K+-Ca2+ was established on soils with different texture and organic matter content. The data on the composition of the equilibrium solution and the exchange complex were used to calculate some selectivity coefficients viz. Gapon (KG), Vanselow (KV), Krishnamoorthy Davis Overstreet (KKDO), KC and KN. None of these selectivity coefficients was constant at different levels of K-saturation. The values of selectivity coefficients were higher for higher organic matter content soil than low organic matter content soil.

Key concepts: Selectivity, Saturation (graph theory), Organic matter, Soil water, Chemistry, Potassium, Cation-exchange capacity, Analytical Chemistry (journal)

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