Department of Agricultural Chemistry and Soil Science, Gujarat Agricultural University, Navsari, Gujarat, 396450
1Present address: Department of Agricultural Chemistry and Soil Science, Dr. Balasaheb Sawant Konkan Krishi Vidyapeeth, Dapoli, Maharashtra, 415712
The adsorption and desorption of zinc was studied in lateritic and non-lateritic soils of Konkan region of Maharashtra state. The adsorption maximum (b) was found to be higher in non-lateritic soils dominant in smectite clay minerals than lateritic soil dominant in kaolinite minerals. Correlation analysis revealed that the zinc adsorption maxima (b) were positively correlated with CaCO3, organic carbon, clay and CEC, indicating dependence of Zn adsorption capacity on CaCO3, organic matter and texture of soil. The sequential extraction of adsorbed zinc from soils showed that the DTPA extracted maximum amount of adsorbed zinc than CaCl2 and Mg(NO3)2. The supply parameter (SP) increased with addition of zinc.
Zinc, adsorption, desorption, smectite, kaolinite sequential extraction, Langmuir adsorption isotherm, supply parameter
