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One noninvasive method that has been used to measure water content is electromagnetic induction. Geonics, Inc. in Canada sells three different instruments (for $15,000+) that measure ground conductivity to different depths. The instruments generate a current in the ground without inserting any probes. The magnitude of the current is a measure of the ground conductivity which depends on water content among other factors. Jan Hendrickx has written a 1995 paper on this: Water Resources Research 31:2401-2409. David E. Radcliffe Crop and Soil Sciences Department University of Georgia Athens GA 30606 TEL 706 542 0897 FAX 706 542 0914 dradclif@uga.cc.uga.edu