Effects of Salts on the Water Retentivity of Water Holding Substances Applied to Sandy Soil

Abstract

Three kinds of water holding substances were applied to sandy soil and the effects of salts on the water retentivity of water holding substances were studied by the measurement of water evaporation from the soil, and bulk density, porosity, three phase distribution of the soil. Water evaporation from sandy soil was repressed by the application of water holding substances, but the repression of water evaporation decreased with an increase of the salt concentration. The difference of water retentivity of the 3 water holding substances was not observed when the salts were added. The bulk density of the soil increased and the porosity of the soil decreased by the addition of salts. Water retentivity of water holding substances decreased by the addition of salts in the order of Ca>Mg>K>Na.