Journal article

Field and laboratory calibration and test of TDR and capacitance techniques for indirect measurement of soil water content

PNJ Lane, DH Mackenzie

AUSTRALIAN JOURNAL OF SOIL RESEARCH | C S I R O PUBLISHING | Published : 2001

Abstract

Time domain reflectometry (TDR) and a frequency domain sensor, the Didcot Capacitance Probe, were tested in the field and laboratory. The results from an undisturbed large core TDR laboratory test found the Topp equation returned a close correspondence to thermogravimetrically derived water content, although there was a slight underestimation. Coefficients of determination and efficiency were >0.98 and 0.92, respectively, for individual cores, and 0.98 and 0.97 for the whole data set. The field exercise revealed the Topp equation to be superior to the laboratory derived equation and other published empirical equations, suggesting the Topp equation to be adequate. A field test of the capacita..

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University of Melbourne Researchers