Xiufu Shuai, Water Resources Research Center, University of Hawaii at Manoa, Holmes Hall 283, 2540 Dole St., Honolulu,, HI 96822, Chittaranjan Ray, Civil and Environmental Engineering, University of Hawaii at Manoa, 2540 Dole St., Holmes Hall 283, Honolulu, HI 96822, Ole Wendroth, N-122M Ag Science N., University of Kentucky, University of Kentucky, Department of Plant & Soil Science, Lexington, KY 40546-0091, and Russell Yost, 3190 Maile Way, Room 102, St. John Building, University of Hawaii, Department of Tropical Plants & Soil Science, Honolulu, HI 96822.
Soil dielectric permittivity measured by Time Domain
Reflectometry (TDR) technique has been used to calculate soil water
content. Soils with variable charge clays may show different relationship
between water content and dielectric permittivity from those with constant
charge clays. The objective is to study the effect of pH on surface
charge and soil dielectric permittivity. Comparison of surface charge and
dielectric permittivity may provide the mechanistic model mechanistic model to
calculate soil water content from complex dielectric permittivity.
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