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Fluorine in Sodic Soils¹

ABSTRACT

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.

¹ Contribution from the Department of Soils and Agronomy, Central Soil Salinity Research Institute, Karnal 132001, India.

² Soil Chemist, Research Fellow and Head, Division of Soils and Agronomy, respectively.

Received for publication November 3, 1978. Accepted for publication August 23, 1979.