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This article in SSSAJ

  1. Vol. 47 No. 5, p. 1036-1038
    Received: June 1, 1982
    Accepted: Apr 20, 1983

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Effect of Entrapped Air on ECa vs. ECw Calibration Curves as Measured in a Soil Column1

  1. H. Frenkel2,
  2. A. Nadler3 and
  3. I. Shainberg2



Measurements of soil electrical conductivity, ECa, for assessing soil solution salinity, ECw, use calibration curves obtained in the field or in the laboratory. It has been found that calibration curves obtained in the laboratory on water-saturated soil columns are very sensitive to entrapped air which affects the calibration slope of ECa − ECw by 25% or more. This difference in the slope is as large as the difference in slopes between soils having 25 and 50% clay. Displacing the entrapped air with CO2 before saturation reduces the problem and produces a more accurate calibration curve.

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