SOIL WATER RETENTION AS RELATED TO PARTICLE SIZE IN SELECTED SANDS AND LOAMY SANDS

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Abstract
Sands and loamy sands within the Glacial Lake Souris basin in North Dakota [USA] vary considerably from one area to another in their particle size distribution. Water retention of these sandy soil textural classes was related to particle size percentage. Water retention percentages, on an oven-dry basis, were determined for samples at field capacity under field conditions and also at 1/10, 1/15 and 1/20 bar soil water suction for air-dried, < 2 mm samples in conventional porous ceramic plate-pressure pot equipment. No single soil water suction produced water retention values adequately representing field capacity for all textures. In most instances the percentage of very fine sand alone and in combinations with the percentages of silt and clay were significantly correlated with soil water values.

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