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This article in SSSAJ

  1. Vol. 44 No. 1, p. 33-36
    Received: Nov 3, 1978
    Accepted: Aug 23, 1979

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Fluorine in Sodic Soils1

  1. R. Chhabra,
  2. Anoop Singh and
  3. I. P. Abrol2



Effect of varying levels of exchangeable sodium percentage (ESP) on the solubility and adsorption of fluorine in a soil was studied in the laboratory. Water-extractable F of 25 differentially gypsum treated and uniformally cropped field plots increased linearly with increase in soil ESP (r = 0.93) and pH (r = 0.95). Incubation studies revealed that a major portion of the added F was immobilized within the 1st 8 days. A relatively lesser quantity of added F was immobilized in soil of higher ESP and pH. Fluorine adsorption by these soils was describeable by Langmuir isotherm up to an equilibrium soluble-F concentration of 0.6 mmol/liter. Beyond this limit the adsorption pattern seemed to reflect immobilization through precipitation. At any equilibrium soluble F concentration, there was a decrease in adsorption of F with increase in soil ESP or pH. Addition of amendments, like gypsum, to these soils which reduce ESP and pH will also simultaneously result in a reduction of water-extractable F.

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