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This article in AJ

  1. Vol. 90 No. 3, p. 441-443
     
    Received: Apr 27, 1997


    * Corresponding author(s): lhyd2ags@auadec.aua.ariadne-t.gr
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doi:10.2134/agronj1998.00021962009000030020x

Comparison of Empirical Equations for Temperature Correction of Gypsum Sensors

  1. Sotiris M. Aggelides  and
  2. Paraskevi A. Londra
  1. Agricultural Univ. of Athens, Lab. of Agric. Hydraulics, 75 Iera Odos, Botanikos, Athens 11855, Greece

Abstract

Abstract

Electrical resistance gypsum sensors (two types from Soilmoisture Equipment Corp. and one type from Anti-Sel Co.) were calibrated for temperature in a specially constructed box with thermal and moisture isolation. Results indicated that the relationship between log values of electrical resistance and temperature for different moisture contents of the porous sensors was linear. To convert electrical resistance values from the field temperature to a reference temperature of 25°C, an equation is proposed for the three different types of resistance sensors. Comparison tests indicated that our suggested equation gives better results, for these three types of gypsum sensors used under the current experimental conditions, than other empirical equations found in the literature.

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