Potassium-Calcium Exchange in Five Ap Soils from Paddy Fields and Its Effect on Potassium Concentration in Soil Solution

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概要

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• We measured the selectivity coefficient (K_V) for K-Ca exchange equilibrium as a function of K-saturation on two smectitic soils, two halloysitic soils and a soil dominated by noncrystalline aluminum silicates. The selectivity coefficients for all the soils decreased as K-saturation increased. Among the five soils, the halloysitic soils exhibited higher K_V values than the smectitic soils, while the K_V values for the soils dominated by noncrystalline aluminum silicates were comparable with those of the halloysitic soils at low K-saturation but the K_V values were even lower than those for the smectitic soils at higher K-saturation. Numerical simulations showed that the K concentration in the soil solution after addition of a K-salt differed significantly among the soils, depending on the exchangeable K status and K-selectivity of the soils.

• 一般社団法人日本土壌肥料学会の論文

著者

• Odahara Koji

  Fukuoka Agricultural Research Center

• Wada Shin-lchiro

  Department of Agricultural Chemistry, Kyushu University

• Wada Shin-lchiro

  Department Of Agricultural Chemistry Kyushu University

関連論文

• Empirical equations for prediction of major cation concentrations in soil solution using concentrations in water extracts(Soil Chemistry and Mineralogy)
• Prediction of nitrate and chloride ion concentrations in soil solution using water extracts(Soil Chemistry)
• Potassium-Calcium Exchange in Five Ap Soils from Paddy Fields and Its Effect on Potassium Concentration in Soil Solution

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