Abstract
The hydrometer method of determining the colloidal content of soils produced results suitable for use in the research activities of the Y.P.D.A., only if the samples were pre-treated with H 2O 2 and HC1 so as to eliminate all organic matter and calcium carbonate. Since in our routine tests, only one or two fractions are determined (of up to 2 and up to 16 μ), relatively little time is saved by using this method instead of Robinson's pipette method. Furthermore, the results of the analysis by the hydrometer method are less easily reproduced than when the pipette method is used.
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