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Tensiometer modification for diminishing errors due to the fluctuating inner water column

Research Centre for Agriculture and Forestry, Laimburg 39040 Auer/Ora (Bz), Italy

View larger version (19K): [in a new window]   Fig. 1. Modified tensiometer design and parameters. zT is the height of the water column in the tensiometer; zB is the water level in the air-expansion bulb; he is the external pressure.

View larger version (32K): [in a new window]   Fig. 2. Schematic design of the laboratory setup for tensiometer testing.

View larger version (26K): [in a new window]   Fig. 3. Comparison of laboratory readings from the modified tensiometer and external pressure during a cycle of progressive pressure reduction and final return to atmospheric pressure.