Soil Anisotropy and Its Relation to Aggregate Stability

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Abstract
For kaolinitic soils containing more than 5% free iron oxide, variations in percentage aggregate stability can be related to soil anisotropy. Soil anisotropy, as used in this paper, refers to the degree of particle orientation. In thin sections, increasing parallel orientation of clay particles within soil aggregates allows increasing reaction of the soil material to polarized light. For soils having essentially identical mineralogies, the amount of light transmitted through crossed polarizers can be related to particle orientation or soil anisotropy. The amount of transmitted light, which is used to measure soil anisotropy, can be measured with a photometer. When percentage aggregate stability was plotted as a function of photometer readings, a significant curvilinear relation was found to exist between these two variables.
Funding Information
  • W.S.W.R.C.

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