Abstract
Sulphate sorption/desorption in four sulphur deficient soil series, namely, Aeric Haplaquept, Fluventic Ustochrept, Typic Fluvaquent and Typic Ustorthent of the Bengal basin was examined at 35°C. The sulphate sorption/desorption data were fitted to six adsorption isotherms, namely, Langmuir, Freundlich, Tempkin, Fitter and Sutton, Gunary and Initial Mass Sulphur (IMS) Adsorption equations were derived, in order to predict better adsorption/desorption processes and parameters. The derived data on these isotherms revealed higher sulphate sorption and also greater extent of hysteresis (indicating greater deficiency) in Aeric Haplaquept and Typic Ustorthent soils. The sorption/desorption capacity of these soils varied moderately with the variations in pH, iron and aluminum fractions, available phosphorus, exchangeable calcium plus magnesium, clay content and organic carbon content of the experimental soils. The data, thus obtained were employed to work out Gibb's free energy of sulphate sorption/desorption, the negative value of which essentially favored the sorption processes in these soils. Soils having greater irreversible sulphate sorption capacity (deficiency) require adequate sulphur (33–50 kg ha−1) in order to ensure optimum plant growth and yield.
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