SSSAJ Journal of Natural Resources and Life Sciences Education
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Published in Soil Sci Soc Am J 29:198-200 (1965)
© 1965 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Soil Anisotropy and Its Relation to Aggregate Stability1

B. Cagauan and G. Uehara2

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.

NOTES

1 Published with the approval of the Director of the Hawaii Agr. Exp. Sta. as Technical Paper No. 684. Data taken from a thesis submitted by the senior author in partial fulfillment of the requirements for an M.S. degree. This study was supported in part by W.S.W.R.C., W-66. Presented before Div. S-1, Soil Science Society of America, Nov. 1963 at Denver, Colo.

2 Former East-West Center grantee and graduate student, and Assistant Soil Scientist, respectively.

Received for publication September 10, 1964. Accepted for publication December 11, 1964.






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Copyright © 1965 by the Soil Science Society of America.