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Soil Research Soil Research Society
Soil, land care and environmental research
RESEARCH ARTICLE

Effect of the method of dispersion on the yield of clay and fine clay

DJ Chittleborough

Australian Journal of Soil Research 20(4) 339 - 346
Published: 1982

Abstract

Because the relative proportion of fine (< 0.2 µm) and coarse clay (2-0.2 µm) is considered an important pedogenetic and taxonomic criterion, the effect on yield of these fractions by different methods of dispersion was investigated for a sandy loam and a clay from the Urrbrae loam. Both soils showed a continued increase in fine clay with time of shaking even after 14 h. This may be a subplasticity effect or due to attrition of coarse clay. Electron micrographs showed that incrustations on coarse clay particles may be a source of fine clay. The amount of total clay from the sandy loam soil continued to rise after 14 h of shaking, but yield from the clay soil was constant after 100 s. Of the chemical treatments only sodium hydroxide had a significant effect. This treatment lead to a marked decrease in the proportion of fine clay. The amount of total and fine clay was unaffected by the 1iquid:solid ratio in the dispersing medium.

https://doi.org/10.1071/SR9820339

© CSIRO 1982

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