Phosphate Sorption-Desorption Characteristics in Two Inceptisols and an Alfisol of Chattisgarh, IndiaEnglish Full Text

A. K. DOLUI and S. S. ROY Department of Agricultural Chemistry and Soil Science, Institute of Agricultural Science, Calcutta University, 35 Bally-gunge Circular Road, Kolkata 700 019 (India).

Abstract: Two Inceptisols and an Alfisol of the Indravati Catchment area in Chattisgarh, India, comprising several gradientsin physical and chemical properties were studied to relate phosphate sorption and desorption to soil properties. Fromthe P isotherm curve, the standard P requirement （SPR） of the soils was determined. Phosphate sorption data were alsofitted both to the Langmuir and Freundlich Equations. The mean sorption maximum values for three different soil serieswere: Bastar ＞ Geedam ＞ Mosodi. The fraction of added phosphate sorbed for the 3 series followed this same trend asdid SPR; the phosphate sorption maximum and the maximum phosphate buffering capacity, which were estimated by theLangmuir isotherm; and the Freundlich constant 1/n. However, phosphate desorption, as well as the maximum recoverypercent did not follow this order. The phosphate affinity constant （K） was also different following the same progressionfor the 3 soil series as the Freundlich constant K’, which measured sorption strength. Meanwhile, an inverse order existedfor K and K’ versus the percent desorbed relative to the sorbed as well as the maximum recovery percent. In addition,significant correlation coefficients among sorption parameters of P and soil factors were found.

Keywords：

Alfisols; Inceptisols; phosphate sorption-desorption;

Series：
(D) Agriculture
Subject：
Fundamental Science of Agriculture; Agronomy
Classification Code：
S153;

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Phosphate Sorption-Desorption Characteristics in Two Inceptisols and an Alfisol of Chattisgarh, IndiaEnglish Full Text

A. K. DOLUI and S. S. ROY Department of Agricultural Chemistry and Soil Science, Institute of Agricultural Science, Calcutta University, 35 Bally-gunge Circular Road, Kolkata 700 019 (India).

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