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Agronomy Journal Abstract -

Apparatus for Measuring Water Vapor Transport at the Soil Surface


This article in AJ

  1. Vol. 86 No. 1, p. 208-211
    Received: Oct 5, 1992

    * Corresponding author(s):
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  1. Ibrahim A. M. Saeed,
  2. C. B. Tanner  and
  3. Thomas J. Sauer
  1. Dep. of Plant Pathology



To fully characterize the water and energy balances of a field crop it is necessary to separate soil evaporation from total canopy evapotranspiration. An alternative to measuring soil evaporation directly is to measure the vapor exchange at the soil surface in order to assess mass transfer there. The objective of this research was to develop a method for measuring vapor exchange coefficients beneath plant canopies. The system consists of a Mariotte siphon water supply apparatus and a felt-covered vapor source plate, both of which were tested under laboratory and field conditions. A detailed description of the devices, their construction and operation, and a sample data set are presented. The system is suitable for long-term field installation and is capable of accurately measuring vapor transfer rates over short time intervals.

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