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Determining Soil Gypsum Content and Expressing Properties of Gypsiferous Soils¹

ABSTRACT

The standard method for measuring the gypsum content of soils is a lengthy one, partly because of the presence of Na and Mg sulfates in most gypsic horizons, and partly because of the difficulty in dissolving all the gypsum in the sample. A more rapid method, sufficiently accurate for taxonomic uses, has been developed and is based on loss of crystal water of gypsum upon heating to 105° C. Percent gypsum, calculated on an oven-dry weight basis from loss of crystal water, equals 1.038 x percent gypsum by the standard chemical method + 0.17. The standard error of estimate for the new method is ± 1.8% gypsum. Equations are given for expressing properties of gypsiferous soils on an oven-dry + crystal water of gypsum weight basis.

¹ Contribution from National Soil Survey Lab., SCS, Lincoln, NE 68508.

² Soil Scientists.

Received for publication September 15, 1977. Accepted for publication March 15, 1978.

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