MOVEMENT OF SALT AND WATER IN RELATIVELY DRY SOILS

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Abstract
Recent experiments by Scotter and Raats are analyzed and a model consistent with their results is developed. Experiments indicate that when the surface of a relatively dry soil is covered with salt crystals, a wet layer containing salt in solution grows under the crystals. The analysis suggests that the water in the wet layer has little movement and that salt diffuses into it from the surface. Water and salt concentration vary almost discontinuously between the wet layer and the drier soil underneath. These discontinuities are maintained by a strong osmotic potential which affects water movement in the vapor phase. Recent experiments by Scotter and Raats are analyzed and a model consistent with their results is developed. Experiments indicate that when the surface of a relatively dry soil is covered with salt crystals, a wet layer containing salt in solution grows under the crystals. The analysis suggests that the water in the wet layer has little movement and that salt diffuses into it from the surface. Water and salt concentration vary almost discontinuously between the wet layer and the drier soil underneath. These discontinuities are maintained by a strong osmotic potential which affects water movement in the vapor phase. © Williams & Wilkins 1973. All Rights Reserved.

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