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This article in SSSAJ

  1. Vol. 41 No. 1, p. 29-33
    Received: June 18, 1976
    Accepted: Sept 3, 1976

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Model of Salt Flow in Soil with a Source-sink Term1

  1. D. Melamed,
  2. R. J. Hanks and
  3. L. S. Willardson2



Irrigation management practices require a knowledge of the salinity in the root zone. Models which simulate the simultaneous movement of water and soils, but ignore the buffering property of the soil fall to predict the root zone salinity distribution in many field situations. The present work develops a model that takes into consideration source and sink processes and tests it under laboratory and field situations.

In determining a “source-sink” term to be included in the model, it was assumed that precipitation and dissolution were the most important source processes and that the rate of the processes was a function of the surrounding concentration.

The parameters for the “sink-source” term for soil columns were determined from effluent data, and were found suitable for predicting the salinity of the entire soil column. Under field conditions, individual parameters for each layer were needed for good prediction.

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