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Fluorine in Sodic Soils
Author(s) -
Chhabra R.,
Singh Anoop,
Abrol I. P.
Publication year - 1980
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1980.03615995004400010008x
Subject(s) - soil water , chemistry , adsorption , gypsum , solubility , sodic soil , precipitation , langmuir adsorption model , environmental chemistry , lime , incubation , langmuir , soil science , geology , organic chemistry , biochemistry , materials science , metallurgy , physics , meteorology
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.