SSSAJ Journal of Natural Resources and Life Sciences Education
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Published in Soil Sci Soc Am J 58:315-318 (1994)
© 1994 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Soil Water Content and Potential Measured by Hollow Time Domain Reflectometry Probe

Norbert Baumgartner, Gary W. Parkin and David E. Elrick*

Department of Land Resource Science, Univ. of Guelph, Guelph, ON, Canada N1G 2W1

*Corresponding author.

ABSTRACT

A new soil probe used in conjunction with time domain reflectometry (TDR), tensiometry, and solution extraction devices and designed to allow simultaneous in situ measurement of soil-water content, matric potential, and solute concentration is proposed. Hollow stainless steel electrodes with a porous stainless steel tip serve as TDR wave guides in a standard two-parallel-probe configuration. The porous tip allows water inside the hollow rods to equilibrate with the soil water in an unsaturated or saturated system. A pressure transducer system is used to measure the soil matric potential around the porous tip. A vacuum pump can be used to withdraw soil solution through the permeable porous tip. A preliminary comparison between measurements of soilwater content obtained by a two-solid-wires TDR probe and the new probe gave encouraging results. Favorable agreement was obtained between measurements of the soil matric potential and depth to an artificial water table.

Received for publication February 19, 1993.


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