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Levy, R., The Volcani Institute of Agricultural Research, Bet-Dagan, Israel
Shainberg, I., The Volcani Institute of Agricultural Research, Bet-Dagan, Israel
Shalhevet, J., The Volcani Institute of Agricultural Research, Bet-Dagan, Israel
Alperovitch, N., The Volcani Institute of Agricultural Research, Bet-Dagan, Israel

The selectivity coefficients of Ca-Mg exchange of three montmorillonitic soils are reported. The percent of montmorillonite in the clay fractions of the two grumusolic soils was about 50 and in that of the sandy clay loam hamra, 80. It was found that the selectivity coefficient for each of the soils, at a Mg saturation above 30%, was unity. Below 30% Mg saturation, the two grumusolic soils showed a preference for Mg, and the sandy clay loam hamra a preference for Ca, equal to that of "pure" montmorillonite. By comparing the selectivity coefficients for the three soils with that of "pure" montmorillonite, it was concluded that the exchange properties of the montmorillonite in soils were masked by cementing agents. © 1972.
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Selectivity coefficients of ca-mg exchange for three montmorillonitic soils
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Levy, R., The Volcani Institute of Agricultural Research, Bet-Dagan, Israel
Shainberg, I., The Volcani Institute of Agricultural Research, Bet-Dagan, Israel
Shalhevet, J., The Volcani Institute of Agricultural Research, Bet-Dagan, Israel
Alperovitch, N., The Volcani Institute of Agricultural Research, Bet-Dagan, Israel

Selectivity coefficients of ca-mg exchange for three montmorillonitic soils
The selectivity coefficients of Ca-Mg exchange of three montmorillonitic soils are reported. The percent of montmorillonite in the clay fractions of the two grumusolic soils was about 50 and in that of the sandy clay loam hamra, 80. It was found that the selectivity coefficient for each of the soils, at a Mg saturation above 30%, was unity. Below 30% Mg saturation, the two grumusolic soils showed a preference for Mg, and the sandy clay loam hamra a preference for Ca, equal to that of "pure" montmorillonite. By comparing the selectivity coefficients for the three soils with that of "pure" montmorillonite, it was concluded that the exchange properties of the montmorillonite in soils were masked by cementing agents. © 1972.
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