Boron sorption studies in differentially fertilized black soil

Boron adsorption studied in differentially fertilized black soil using Langmuir, Freundlich, Fitter and Sutton, Gunary and initial mass boron adsorption isotherm equations have shown excellent fit of adsorption data. Compared to Langmuir, other statistically sound adsorption equations could explain the boron adsorption better. Inclusion of labile B to the adsorbed B gave an equally good fit, with regression coefficient values > 0.900. Boron adsorption maxima (b), constant related to energy of adsorption (K) and buffering capacity varied from 39.8 to 140.8 mg kg⁻¹, 0.032 to 0.320 mg L⁻¹ and 4.5 to 13.3 L kg⁻¹, respectively. Correlation coefficients between soil characters and B adsorption constants showed the significant influence (> ±0.526 to ±0.990) of calcium carbonate, organic carbon and cation exchange capacity.