Madras Agricultural Journal
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A comparative study of the dispersing powers of sodium and ammonium hydroxides with reference to the disper sion of Mysore black cotton soil and the Hebbal soil

Abstract

Animonium hydroxide was advocated for the dispersion of soils by the International Society of Soil Science in 1927, at its meeting in Washington. In 1934, at Versailles, it recommended the use of sodium hydroxide instead. The results obtained with a black cotton soil in this laboratory (vide infra) support this change. The factors which contribule towards the higher dis- persive power of sodium hydroxide have been investigated by studying (o) dispersion of the soils and the clay fractions, (b) flocculation valuse of the clays and (c) the sedimentation volumes of the clays

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