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This article in SSSAJ

  1. Vol. 42 No. 4, p. 659-661
    Received: Sept 15, 1977
    Accepted: Mar 15, 1978

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Determining Soil Gypsum Content and Expressing Properties of Gypsiferous Soils1

  1. R. E. Nelson,
  2. L. C. Klameth and
  3. W. D. Nettleton2



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 × 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.

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