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DIVISION S-1—NOTES

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

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

^* Corresponding author (martin.thalheimer{at}provinz.bz.it)

The fluctuation of the height of the water column inside tensiometers constitutes a source of systematic error in the measurement of soil water potential. The influence of the fluctuating water column can be strongly reduced by measuring pressure in a confined air space close to the tensiometer tip. A simple technique of inserting a lower air space connected to the pressure sensor is presented. Successful laboratory tests were performed on a tensiometer of 1-m length with an applied pressure range from 0 to -80 kPa.

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				J. M. Hubbell and J. B. Sisson Comments on "Tensiometer modification for diminishing errors due to the fluctuating inner water column" Soil Sci. Soc. Am. J., March 1, 2004; 68(2): 709 - 710. [Full Text] [PDF]