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This article in SSSAJ

  1. Vol. 67 No. 3, p. 737-739
    Received: May 21, 2002

    * Corresponding author(s): martin.thalheimer@provinz.bz.it
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Tensiometer modification for diminishing errors due to the fluctuating inner water column

  1. Martin Thalheimer *
  1. Research Centre for Agriculture and Forestry, Laimburg 39040 Auer/Ora (Bz), Italy


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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Copyright © 2003. Soil Science SocietyPublished in Soil Sci. Soc. Am. J.67:737–739.