SPECIFIC EFFECT OF MAGNESIUM ON THE HYDRAULIC CONDUCTIVITY OF SODIC SOILS |
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| Authors: | N ALPEROVITCH I SHAINBERG R KEREN |
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| Institution: | Institute of Soils and Water, The Volcani Center, Agricultural Research Organization, P.O.B. 6, Bet Dagan, Israel. Contribution no. 322-E, 1980 series |
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| Abstract: | Exchangeable Mg does not have a specific effect on the hydraulic conductivity (HC) and clay dispersion in calcareous soils. Conversely, in well-weathered soils, which do not contain CaCO3, a specific effect of exchangeable Mg is evident, on both HC losses and clay dispersion, when the Na/Mg soils are leached with distilled water (simulating rain water). Soil clays, when Mg-saturated, are chemically more stable and do not release electrolytes into the solutions: they thus disperse more easily when leached with distilled water. The presence of exchangeable Mg enhances the dissolution of CaCO3 in calcareous soils, and the electrolytes prevent the dispersion of the clay and HC losses in the Na/Mg calcareous soils. |
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