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Hydraulic Load-Cell Lysimeter, Construction, Calibration, and Tests¹

ABSTRACT

The construction and calibration of two 35-metric ton, hydraulic load-cell lysimeters with suction drainage systems are described. The butyl-nylon load cells contain an ethylene glycol-water mixture and pressures are measured with a capacitive pressure transducer. Lysimeter sensitivity is 0.02 mm evaporation. Daily evaporation from the lysimeter and the two independent micrometeorological methods agreed to within 5%. On a June day, lysimeter measurements of evaporation from bare soil lagged measurements using the two other methods by almost 1.5 hours. Differences between the lysimeter thermal regime and that in the surrounding soil accounted for the lag. By using foam plastic insulation of the tank walls, thermal regime differences were minimized.

¹ Contribution of the Department of Soil & Water Sciences, University of Wisconsin, Madison. Published with the permission of the Director of the University of Wisconsin Agr. Exp. Sta. This work was supported in part by the National Science Foundation, Atmospheric Sciences Section, NSF Grant GP2404, and USDA Hatch Funds.

² Research assistant, Assistant professor and Professor, respectively.

Received for publication February 5, 1968. Accepted for publication May 13, 1968.