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This article in SSSAJ

  1. Vol. 49 No. 5, p. 1260-1263
    Received: Dec 31, 1984
    Accepted: Apr 16, 1985

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Effect of Electrolytic Concentration on the Hydraulic Properties of Depositional Crust1

  1. I. Shainberg and
  2. M. J. Singer2



Depositional crusts form when turbid water infiltrates into soil. These crusts reduce the rate of water penetration. Hydraulic conductivity of two California soils was measured as a function of volume of suspension infiltrated and electrolytic concentration in the range ≤ 0.005 M. Whereas the hydraulic conductivity of the bulk soils was not affected by electrolytic concentration; the hydraulic conductivity of the soil columns with depositional crust increased by two orders of magnitude as the electrical conductivity (EC) of the suspension increased from 0.1 to 0.55 dS m−1. Saturated hydraulic conductivity of depositional crust made of flocculated particles was much higher than saturated hydraulic conductivity (HC) of crust made of dispersed clay and silt particles. Drying of the crusted soils destroyed the crust and restored the rate of water penetration. The curves of water penetration in consecutive irrigations were similar to that in the first irrigation. Phosphogypsum maintained high water penetration in three consecutive irrigations by increasing the electrolytic concentration in the solution above the clay flocculation values.

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