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Multiple Tensiometer Flushing System¹

ABSTRACT

A system for simultaneous flushing of a large number of tensiometers is described. It includes a multiple shutoff valve and a manometer with movable bottom. Flushing procedures are described; they are fast and simple. It can be used with any direction of installation of tensiometers or tubing, for instance, when all tubing is kept below the soil surface to reduce temperature fluctuations. A concentric tubing arrangement reduces air diffusion into the measuring tubing. The system offers potential for improved data quality and reduced need for flushing.

¹ Contribution from the U. S. Salinity Laboratory, Agricultural Research Service, USDA, 4500 Glenwood Drive, Riverside, CA 92501.

² Physical Science Technician and Soil Scientist, respectively.

Received for publication August 8, 1977. Accepted for publication October 25, 1977.