THE EFFECT OF SOIL PROPERTIES ON ADSORPTION AND DESORPTION OF ZINC BY ALKALINE SOILS

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Abstract
The adsorption of Zn by 7 alkaline soils of Punjab, India followed the Langmuir equation. At high applied concentrations, however, Zn was probably precipitated as hydroxide. Sequential desorption of adsorbed Zn with 1 M KCl and 0.05 M Cu(CH3COO)2 provided a measure of its exchangeable and chelated forms. Adsorption-desorption parameters were computed by analyzing the data according to Langmuir equations. The influence of soil properties on the adsorption-desorption of Zn was illustrated by correlating them with Langmuir coefficients. Significant zero order correlation coefficients exist between Sm, Rm1, or Rm2 and clay, organic C, CaCO3, or CEC. The retaining powers of clay and organic matter are predominantly due to their CEC [cation exchange capacity]. Although clay functions independently, CaCO3 and organic matter interact with one another for adsorption of Zn.