TY - JOUR
T1 - Potassium-calcium exchange in five Ap soils from paddy fields and its effect on potassium concentration in soil solution
AU - Wada, Shin-Ichiro
AU - Odahara, Koji
AU - Odahara, Koji
PY - 1993/1/1
Y1 - 1993/1/1
N2 - 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 Vvalues than the smectitic soils, while the K Vvalues for the soils dominated by noncrystalline aluminum silicates were comparable with those of the halloysitic soils at low K-saturation but the K Vvalues 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.
AB - 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 Vvalues than the smectitic soils, while the K Vvalues for the soils dominated by noncrystalline aluminum silicates were comparable with those of the halloysitic soils at low K-saturation but the K Vvalues 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.
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U2 - 10.1080/00380768.1993.10416982
DO - 10.1080/00380768.1993.10416982
M3 - Article
AN - SCOPUS:0005095750
VL - 39
SP - 129
EP - 138
JO - Soil Science and Plant Nutrition
JF - Soil Science and Plant Nutrition
SN - 0038-0768
IS - 1
ER -