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Phosphorus sorption characteristics of some Indian representative agricultural soils belonging to four soil orders namely Vertisol, Inceptisol, Alfisol and Ultisol were investigated for adsorption behaviour of P and sorption data were fitted to Langmuir and Freundlich equations. The Langmuir constant i.e. adsorption maxima was highest for Vertisol (716.85 μg g -1 ), followed by Ultisol (633.3 μg g -1 ), Alfisol (501.46 μg g -1 ) and Inceptisol (522.93 μg g -1 ) respectively. The Freundlich ‘k’ value for Vertisol, Inceptisol, Alfisol and Ultisol were 159.12, 59.41, 110.57 and 181.36 μg g -1 respectively, whereas the ‘n’ values were 2.05, 1.92, 2.49 and 3.07 g ml -1 respectively. The phosphate adsorption isotherm gave good fit adopting Langmuir (r 2 = 0.96 to 0.99) and Freundlich (r 2 = 0.95 to 0.99) for the four soils. Phosphorus sorption maxima was significantly correlated with clay (r 2 =0.70), Al (r 2 = 0.73) and Fe (r 2 =0.81) forms, MPBC (r 2 =0.67) and Freundlich constants (r 2 =0.82). Among the various soil properties which correlated with P sorption maxima of significance was clay content (r 2 =0.97) was significantly correlated. The study illustrated that P sorption isotherm in relation to soil properties can be used as a tool of P management in sustainable crop production. SAARC J. Agri., 14(1): 1-9 (2016)

Phosphate sorption parameters in relation to soil properties in some major agricultural soils of India