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Indian Journal of Agricultural Research

AN APPRAISAL OF PHOSPHATE SUPPLY CHARACTERISTICS OF SOME SOILS IN HUMID SUB-TROPIC AND SEMI-ARID REGIONS OF INDIA

DOI: 10.5958/0976-058X.2014.00660.X    | Article Id: A-3913 | Page : 269-277
Citation :- AN APPRAISAL OF PHOSPHATE SUPPLY CHARACTERISTICS OF SOME SOILS IN HUMID SUB-TROPIC AND SEMI-ARID REGIONS OF INDIA.Indian Journal of Agricultural Research.2014.(48):269-277
B.K. Medhi*, D.S. Ruhal, C.P. Singh and D.K. Groover binoy_medhi@yahoo.com
Address : Department of Soil Science, C.C.S. Haryana Agricultural University, Hisar 125 004, India

Abstract

Relationships between soil characteristics and phosphate supplying parameters were determined in well defined soil series of Assam and Haryana. Available  P and phosphate supplying capacity were significantly and positively correlated with pH, electrical conductivity and exchangeable sodium percentage and negatively with different fractions of iron and aluminium. Phosphorus adsorption parameters viz. adsorption maxima and energy involvement of phosphorus adsorption were determined as per the method of standard batch technique. Adsorbed P at 0.2 mg mL-1 of equilibrium P solution, distribution coefficient, equilibrium phosphate potential, differential phosphate potential buffering capacity, Langmuir’s adsorption maxima (b1 and b2) and Freundlich’s K were correlated negatively with pH, EC, ESP and positively with different fractions of iron and aluminium. Adsorption maxima and bonding energies were not related with each other and total energy of P adsorption was always constant with negative correlation between k1 and k2 (r = -0.545**).

Keywords

Assam Haryana Phosphate supplying parameters Langmuir Freundlich.

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