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Changes in Fiber-Glass Soil Moisture-Electrical Resistance Elements in Long-Term Installations¹

Department of Soil Science, North Carolina State of the University of North Carolina, Raleigh, N. C.

ABSTRACT

The entrance of soil constituents into the interelectrode material of Colman soil moisture units causes changes in calibrated moisture-resistance relations. The degree and abruptness of change is related to depth of placement in the soil. Regular field calibration checks must be performed in order to correct for these changes.

¹ Contribution from the Soil Science Department, North Carolina Agr. Exp. Sta., Raleigh, North Carolina. Published with the approval of the Director of Research as Paper No. 1881 of the Journal Series. Acknowledgment is made of Tennessee Valley Authority financial assistance.

Received for publication October 22, 1964. Accepted for publication December 4, 1964.