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Published in Soil Sci Soc Am J 32:770-774 (1968)
© 1968 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Influence of Soil Structure on Water Relations in Low Humic Latosols: II. Water Movement1

M. L. Sharma and G. Uehara2

ABSTRACT

Experiments were carried out to study the effect of two aspects of structure, macrofabric (arrangement of peds) and microfabric (arrangement of primary particles within the ped), on water movement. Two latosolic soils of nearly similar composition and varying greatly in soil fabric were used. Capillary conductivity of the soils and their water-stable aggregates were obtained. The results showed that the effect of macrofabric on water movement was more pronounced in the lowtension range (0–0.2 bar). Identical flow rates were obtained for the same size water stable aggregates of both soils, suggesting that intra-ped pores did not significantly contribute to water flow in this tension range. It was suggested, however, that microfabric might influence fluid flow properties in the high tension range.

NOTES

1 Part of a dissertation submitted by the senior author in partial requirement of the Doctor of Philosophy degree at the University of Hawaii. Published with the approval of the Director, Hawaii Agr. Exp. Sta., as Technical Paper no. 885 and the Director, Hawaii Institute of Geophysics as Contribution 000.

2 Assistant Soil Physicist, Water Resources Research Center; and Associate Soil Scientist. Department of Agronomy and Soil Science, University of Hawaii, respectively.

Received for publication January 15, 1968. Accepted for publication August 27, 1968.






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