FIFTEEN-ATMOSPHERE PERCENTAGE AS RELATED TO THE PERMANENT WILTING PERCENTAGE

Abstract
Permanent wilting percentage and moisture-equivalent values detd. on a group of soils from western U. S. are compared with the 15-atmosphere and the ^-atmosphere percentages. For these soils, the 15-atmosphere % forms a fairly definite lower limit below which the permanent wilting % seldom falls. For 102 of 119 of the soils, the permanent wilting % is in the moisture range between the 15-atmosphere % and 1.5% of moisture above that figure. The ^-atmosphere % corresponds closely to the moisture equivalent for coarse-textured soils (moisture equivalent < 22).

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