Department of Chemistry, G. B. Pant University of Agriculture & Technology, Pantnagar-263 145 (Uttaranchal), India.
1 Department of Soil Science.
Adsorption-desorption of sulfosulfuron on four Indian hill soils was studied using batch equilibrium technique. Freundlich constant log K was highest for mollisol-2 soil having low organic carbon, clay content and high pH. Adsorption was in the order inceptisol > mollisol-2 > mollisol-I > entisol. Sulfosulfuron showed S-type adsorption isotherm curves indicating hydrophilic nature of surface of soils due to which water molecules compete with the herbicide. Sulfosulfuron showed negative hysteresis or irreversiblc adsorption with hysteresis coefficient values more than 1.
