Summary A quantitative assessment was made of the effect of the proportion of sand, silt, clay, and organic matter in twenty‐six soils on the available‐water capacities (AWC) of the soils. The AWC of a soil was negatively correlated with percentage coarse sand and positively correlated with the percentages of International fine sand (or American silt) and organic C. Using a regression equation, the AWC's of the soils were estimated from mechanical analysis data with a mean accuracy of ± 16 per cent of the mean AWC.
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Salter et al. (1966) studied this question.
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