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2004•Journal of the Indian Society of Soil ScienceOpen access

Sulphate Adsorption Characteristics of Some Alfisols of Orissa

Prosad Kumar Das, S.K. Sahu, N. Acharyya

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Abstract

Sulphate adsorption characteristics of the surface soils and sub-soils of five Alfisols of the state were studied. Adsorption of SO42− was higher in the sub-soils than in the surface soils which was attributed to higher clay, free Fe2O3, exchangeable Ca2+ + Mg2+ and lower organic matter contents in the former than in the latter. Free Fe2O3 had the dominant role in SO42− adsorption, followed by clay and exchangeable Ca2+ + Mg2+. These three factors alongwith free A12O3, pHw and organic carbon jointly contributed 99.2 to 99.9 per cent of variations in SO42− adsorption at different levels of SO42−-S added. Equilibrium buffering capacity and maximum buffering capacity for SO42−-S increased, whereas supply parameter of SO42−-S decreased from surface to the sub-soils.

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What this paper is about

Sulphate adsorption characteristics of the surface soils and sub-soils of five Alfisols of the state were studied. Adsorption of SO42− was higher in the sub-soils than in the surface soils which was attributed to higher clay, free Fe2O3, exchangeable Ca2+ + Mg2+ and lower organic matter contents in the former than in the latter. Free Fe2O3 had the dominant role in SO42− adsorption, followed by clay and exchangeable Ca2+ + Mg2+. These three factors alongwith free A12O3, pHw and organic carbon jointly contributed 99.2 to 99.9 per cent of variations in SO42− adsorption at different levels of SO42−-S added. Equilibrium buffering capacity and maximum buffering capacity for SO42−-S increased, whereas supply parameter of SO42−-S decreased from surface to the sub-soils.

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Available abstract

Sulphate adsorption characteristics of the surface soils and sub-soils of five Alfisols of the state were studied. Adsorption of SO42− was higher in the sub-soils than in the surface soils which was attributed to higher clay, free Fe2O3, exchangeable Ca2+ + Mg2+ and lower organic matter contents in the former than in the latter. Free Fe2O3 had the dominant role in SO42− adsorption, followed by clay and exchangeable Ca2+ + Mg2+. These three factors alongwith free A12O3, pHw and organic carbon jointly contributed 99.2 to 99.9 per cent of variations in SO42− adsorption at different levels of SO42−-S added. Equilibrium buffering capacity and maximum buffering capacity for SO42−-S increased, whereas supply parameter of SO42−-S decreased from surface to the sub-soils.

Key concepts: Adsorption, Soil water, Organic matter, Alfisol, Total organic carbon, Chemistry, Cation-exchange capacity, Carbon fibers

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