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Determining Soil Gypsum Content and Expressing Properties of Gypsiferous Soils
Author(s) -
Nelson R. E.,
Klameth L. C.,
Nettleton W. D.
Publication year - 1978
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1978.03615995004200040025x
Subject(s) - gypsum , dissolution , soil water , mineralogy , soil science , geology , chemistry , environmental science , paleontology
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.