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Abstract

 

This article in SSSAJ

  1. Vol. 43 No. 3, p. 429-433
     
    Received: Oct 23, 1978
    Accepted: Feb 19, 1979


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doi:10.2136/sssaj1979.03615995004300030001x

Salt Effects on the Hydraulic Conductivity of a Sandy Soil1

  1. H. Pupisky and
  2. I. Shainberg2

Abstract

Abstract

The changes in the hydraulic conductivity of a Red Brown sandy soil as a function of the concentration and SAR of the percolating solutions were measured. Also, the changes in the hydraulic heads along the soil column and analysis of the salt and clay concentrations in the effluent solutions were recorded. The data show that at high ESP's and at salt concentration above 0.01N, swelling of the clay is the main mechanism responsible for hydraulic conductivity decrease. At low ESP and very dilute soil solutions, dispersion and clay migration into the conducting pores are the main mechanisms responsible for plugging the soil pores. Dispersion of the clay particles is possible only when the concentration of the soil solution drops below a threshold concentration at which the clay platelets flocculate. Dispersion of the clay may lead also to an increase in hydraulic conductivity when a sandy soil is leached with distilled water.

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