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Measurements of Capillary Conductivity for a Taiwan Latosol and Alluvial Soils¹

ABSTRACT

The capillary conductivities of natural cores and sieved samples of Taiwan latosol have been determined and compared with those of alluvial soils. Calculations were made from pressure plate outflow data at 0.06- to 0.10-, 0.10- to 0.20-, 0.20- to 0.33-, and 0.33- to 0.50-atm. ranges by the methods of Gardner, and of Miller-Elrick which was extended for non-negligible plate impedance. In the case of non-negligible plate impedance, the Gardner method met limitation, and the Miller-Elrich method was preferable. At low moisture tension, the capillary conductivity of the clayey latosol was similar to that of sandy soils. It seems that no generalization is yet possible about the influence of soil texture upon capillary conductivity.

¹ Contribution from the Department of Agricultural Chemistry, National Taiwan University, Taipei, China. Part of thesis submitted by the senior author in partial fulfillment of the requirements of the M. S. degree. The authors are grateful to Professors G. B. Bodman and D. R. Nielsen, University of California for reading the manuscript and giving valuable criticism.

² Research assistant and Professor of Soils, respectively.

Received for publication May 21, 1962. Accepted for publication September 6, 1962.