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This article in SSSAJ

  1. Vol. 33 No. 1, p. 15-18
    Received: May 2, 1968
    Accepted: July 22, 1968

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The Effect of Osmotic Pressure Gradients on Water Movement in Unsaturated Soil1

  1. J. Letey,
  2. W. D. Kemper and
  3. L. Noonan2



Water movement, in response to osmotic pressure gradients, was measured in clay loam and sandy loam soils at soil water suctions from 0.08 to 15 bars. Movement in response to osmotic pressure gradients were compared to movement in response to hydraulic pressure gradients in the soil water suction range from 0.08 to 0.65 bars. At suction less than 0.5 bars, the amount of water moved by osmotic pressure gradients was generally less than 4% of the water moved by hydraulic gradients of equal magnitude.

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