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This article in SSSAJ

  1. Vol. 64 No. 6, p. 1922-1925
    Received: June 25, 1999

    * Corresponding author(s): m.a.hilhorst@imag.wag-ur.nl
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A Pore Water Conductivity Sensor

  1. M. A. Hilhorst *
  1. IMAG-DLO, P.O. Box 43, NL-6700 AA Wageningen, The Netherlands


The electrical permittivity and conductivity of the bulk soil are a function of the permittivity and conductivity of the pore water. For soil water contents higher than 0.10 both functions are equal, facilitating in situ conductivity measurements of the pore water. A novel method is described, based on simultaneous measurements of permittivity and conductivity of the bulk soil from which the conductivity of the pore water can be calculated. A prototype of a pore water conductivity sensor based on this method is presented. Validation results show that the method can be used for a broad range of soils and is valid for water contents between 0.10 and saturation and for the conductivity of the pore water up to 0.3 S m−1

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