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An Electrical Readout System for Tensiometers¹

ABSTRACT

Commercially available pressure transducers (PTs) and tensiometers were combined to continuously monitor in situ soil pore-water pressure. The transducers were calibrated over a range of 0 to –76.5 kPa and a temperature range from 5 to 40°C. A single calibration equation corrected for zero offset and a small temperature-induced variation. Field temperature fluctuations between 10 and 30°C had little effect on results from PTs connected to constant pressures of –5 and –11.5 kPa. Wetting fronts were easily mapped with outputs from tensiometers placed at three different depths. From these field data, prior water history and diurnal changes in soil pore-water pressure were easily obtained. Given variable field conditions, results from the PTs agreed well with closely-placed Bourdon gauge tensiometers.

¹ Research supported by the College of Agricultural and Life Sciences, Univ. of Wisconsin-Madison.

² Associate Professor, Research Assistant, and Specialist, respectively, Dep. of Soil Science, Univ. of Wisconsin-Madison, Madison, WI 53706.

Received for publication August 19, 1985.

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