Phosphate sorption desorption characteristics of some ferruginous soils of tropical region in Eastern India |
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| Authors: | R Bera A Seal P Bhattacharyya K Mukhopadhyay R Giri |
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| Institution: | (1) NBSS & LUP (ICAR), Block-DK, Sector-II, Salt Lake, Kolkata, 700091, West Bengal, India;(2) West Bengal State Council of Science & Technology, Bikash Bhawan, North Block, 4th Floor, Salt Lake City, Kolkata, 700091, West Bengal, India;(3) Department of Agricultural Chemistry & Soil Science, Institute of Agricultural Science, Calcutta University, 35, B. C. Road, Kolkata, 19, West Bengal, India |
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| Abstract: | Phosphate sorption and desorption experiments were conducted with four ferruginous soils (alfisols) of Eastern India, in view of the low native phosphate concentrations in tropical Indian soils. From the P-isotherm curve, standard P requirement (SPR) of the soils was determined. Phosphate sorption data were fitted to both Langmuir and Freundlich equations and mean sorption maximum values obtained for the different soil series were in the decreasing order as Matimahal > Anandapur > Mrigindih > Kashipur. The fraction of added P sorbed followed the same trend as SPR, P sorption maximum (Pmax), phosphate affinity constant (K), maximum phosphate buffering capacity (MPBC), Freundlich constant K′ and phosphate desorption values. Phosphate sorption maximum was significantly correlated with MPBC, Freundlich 1/n, SPR, clay and different forms of Fe and Al. The value of K (bonding energy) was significantly correlated with MPBC, Freundlich K′ and pyrophosphate extractable Fe and Al. The MPBC was significantly correlated with Freundlich K′, Freundlich constant 1/n, clay, oxalate and dithionite extractable, amorphous and crystalline form of Fe and Al. Freundlich K′ was significantly correlated with Freundlich 1/n, pHwater, clay, dithionite extractable and crystalline form of Fe and Al. The results suggested that the soils having higher amount of extractable and reactive Fe and Al shared higher P sorbtion capacity and such soils may need higher levels of P application |
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| Keywords: | Phosphorous sorption– desorption Phosphorous sorption maximum Phosphorous affinity constant Maximum phosphorous buffering capacity Standard phosphorous requirement Alfisols |
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