Effect of Soil Organic Matter Removal on Phosphorus Sorption in Some Calcareous Soils of East Azerbaijan Province

Document Type : Original Article

Authors

1 Former Graduate Student, Department of Soil Science, College of Agriculture, University of Tabriz

2 Associate Professor, Department of Soil Science, College of Agriculture, University of Tbriz

3 Associate Professor, Department of Soil Science, College of Agriculture, University of Tabriz.

Abstract

This study was carried out to obtain soil organic matter (SOM) influence on phosphorous (P) sorption in the 12 calcareous soil samples. SOM was removed with sodium hypochlorite (NaOCl) solution (pH=8).Soils were brought into equilibrium with varying solution concentrations of  P, and the amounts removed from solution were used to check the fit to three adsorption isotherms, namely, Freundlich, two- surface Langmuir and Dubinin- Radushkevich. Results showed that the amount of P sorption after SOM removal was increased and fits of adsorption equations showed that single-surface Langmuir equation did not describe P sorption in the soils, but a two-surface Langmuir, Freundlich and Dubinin-Radushkevich equations showed statistically significant (P<0/01 )fits to the data for the selected soils. After SOM removal, on the average KF and n, Freundlich adsorption coefficients increased 28 and 3 percentage respectively. Langmuir coefficient for the first site,K1,due to SOM removal markedly increased. qm ,adsorption maxima estimated by Dubinin-Radushkevich equation 21 percentage increased after SOM removal. E, is Dubinin Radushkevich adsorption coefficient the magnitude of which is proportional to the binding energy of P to the soil, was calculated 10 (KJmol-1), chemical forces may affect the sorption. The standard P requirement (P0.2) estimated from Freundlich equation in NaOCl treated soils increased by 30 percentages.

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