Summary
An investigation has been made of the effects upon soil dispersion of different sized particles of gypsum and of methods of counteracting this effect. A final, recommended procedure for particle size determination in gypsic soils has been formulated and which depends upon the fact that treatment of gypsum crystals with barium chloride solution forms a protective coating of barium sulphate which isolates the gypsum from all further reaction in an alkaline medium. Satisfactory results have been obtained for soils containing up to over 90 percent gypsum, even if present in very fine particles of less than 0.05 mm.
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References
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Additional information
Food & Agriculture Organization of the United Nations
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Hesse, P.R. Particle size distribution in gypsic soils. Plant Soil 44, 241–247 (1976). https://doi.org/10.1007/BF00016973
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DOI: https://doi.org/10.1007/BF00016973