SPECIFIC EFFECT OF MAGNESIUM ON THE HYDRAULIC CONDUCTIVITY OF SODIC SOILS
N. AlperovitchInstitute of Soils and Water, The Volcani Center, Agricultural Research Organization, P.O.B. 6, Bet Dagan, Israel. Contribution no. 322-E, 1980 seriesI. ShainbergInstitute of Soils and Water, The Volcani Center, Agricultural Research Organization, P.O.B. 6, Bet Dagan, Israel. Contribution no. 322-E, 1980 seriesR. KerenInstitute of Soils and Water, The Volcani Center, Agricultural Research Organization, P.O.B. 6, Bet Dagan, Israel. Contribution no. 322-E, 1980 series
1981en
ABI
Abstract
Summary 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 CaCO 3 , 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 CaCO 3 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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