Abstract
Path coefficient analysis, a statistical technique that differentiates between correlation and causation, was employed to describe zinc (Zn) and boron (B) adsorption on soils. A path analysis model evaluating the effect of clay, free calcium carbonate (CaCO3), organic carbon (OC) and cation exchange capacity (CEC) on Zn and B adsorption as measured by Langmuir adsorption maxima ‘b’ values in surface (0–25 cm) soils possessing varied physico-chemical and mineralogical characteristics was developed. Correlation analysis showed the dominant role of clay and OC, and clay alone in affecting B and Zn adsorption, respectively, while path analysis described the significant direct effect of clay and indirect effect of CEC via clay on Zn adsorption and the significant direct effect of CEC and OC and indirect effect of clay via CEC on B adsorption. Path analysis model constructed for CEC exhibited the significant direct contribution made by clay towards CEC in both the experimental soils, thus, revealing the relationship between CEC and adsorption of Zn and B.
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