2006•Journal of the Indian Society of Soil ScienceOpen access

Effect of pH and lime on sulphate adsorption in some Alfisols of Orissa

Prosad Kumar Das, S.K. Sahu, Debasis Sarangi

Abstract

Effect of pH and lime on sulphate adsorption was investigated in five Alfisols of Orissa. Sulphate adsorption decreased with increase in equilibrium pH of the SO42− solutions added. Distribution coefficient of SO42−-S decreased sharply with increase in equilibrium pH indicating that the SO42− adsorption in these soils was highly pH-dependent. Liming the soils by Woodruff's buffer method increased the pH in different soils ranging between 7.3 and 8.1 and caused a drastic reduction in SO42− adsorption varying from 60 to 93.5% in different soils. There were significant reductions in Freundlich K, Langmuir adsorption maxima, equilibrium buffering capacity and maximum buffering capacity of the soils after liming.

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Key concepts: Adsorption, Lime, Soil water, Langmuir, Chemistry, Freundlich equation, Alfisol, Soil pH