Research Article 
Determining of Soil Phosphorus Requirement with Application of Freundlich Adsorption Isotherm
A.A. Naseri, Y. Hoseini, H. Moazed, F. Abbasi and H.M.V. Samani
Asian Journal of Agricultural Research, 2010, 4(4), 226-231.
Abstract
Phosphorus (p) adsorption characteristics of 5 soil samples were studied in soils of Southeastern Iran during 2009/2010 cropping season. Some soil properties as well as selected P-adoption characteristics were studied in these soils, Results show for this study Freundlich adsorption isotherm has good match with phosphorus adsorbed data and has good R-square. Freundlich sorption isotherms were used to evaluate the P requirement of 5 soils in a lab study. The soils were medium to heavy textured, acidic in reaction and were highly calcareous. Amount of P sorbed by the soils increased with increasing P in equilibrium solution. Quantities of P retained on sod solid phase were significantly correlated (p<0.05) with clay content of the soils. Maximum P was sorbed by a soil that had the maximum (64%) Clay content. there were negative relationship between P adsorption capacity and SOC and Ca content of soils.
ASCI-ID: 12-50
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