SSSAJ Journal of Natural Resources and Life Sciences Education
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Published in Soil Sci Soc Am J 27:18-21 (1963)
© 1963 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Measurements of Soil Moisture Diffusivity from Tension Plate Outflow Data1

R. R. Bruce and A. Klute2

ABSTRACT

A tension plate apparatus was designed for measuring volume of water outflow from samples of porous material as a function of time. Volume outflow was measured from samples of glass beads and sand at moisture tensions < 200 cm. of water. In the calculation of moisture diffusivity, published theory and procedures were used. The experimental volume outflow of water in the low moisture tension range of all porous materials studied did not agree with that predicted by presently developed theory. Agreement with theory apparently improved in the higher tension range. This disagreement of theory and experiment is not presently explainable. Values of moisture diffusivity were calculated by fitting the outflow data near (Q{infty} - Qt)/Q{infty} equals 0.5. Although the accuracy of these moisture diffusivity values is uncertain, the general nature of the moisture diffusivity-moisture tension relationship is shown.

NOTES

1 Contribution from Department of Agronomy, Mississippi Agr. Exp. Sta., State College, and Department of Agronomy, University of Illinois, Urbana. Approved for publication as Journal Article No. 1009. Presented before Div. I, Soil Science Society of America, Dec. 7, 1960, at Chicago, Ill.

2 Associate Professor, Mississippi State Univ., and Professor, Univ. of Illinois, respectively.

Received for publication March 12, 1962. Accepted for publication May 1, 1962.






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