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Effect of Sample Drying on the Determination of the Water-stability of Soils¹

ABSTRACT

Water-stability analyses, to determine structural quality in soils, reflect field conditions only to the extent that the soil samples on which they are based remain unmodified (or are modified uniformly) by the treatment received between the times of sampling and analysis. Air drying of the sample is an accepted procedure. This paper reports the effects of air drying samples at different temperatures as indicated by the results of water-stability analyses. It is concluded that if the samples are air dried at rates and temperatures that are characteristic of ordinary variations in laboratory conditions, the variations of stability so induced do not modify greatly the relative levels of stability represented by the samples. However, the induced variation was greater, over a temperature range of from 40°F to 180°F, than that between duplicate analyses.

¹ Presented before Division VI, Soil Science Society of America, Cincinnati, Ohio, November 21, 1952.

² Soil Conservation Service, U. S. Department of Agriculture, Beltsville, Md.

Received for publication November 28, 1952.