Potassium-calcium exchange in five Ap soils from paddy fields and its effect on potassium concentration in soil solution

Shin-Ichiro Wada, Koji Odahara, Koji Odahara

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12 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)129-138
Number of pages10
JournalSoil Science and Plant Nutrition
Volume39
Issue number1
DOIs
Publication statusPublished - Jan 1 1993

All Science Journal Classification (ASJC) codes

  • Soil Science
  • Plant Science

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