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ThesisItem Open Access Persistence of benfuracarb in brinjal and soil and it’s adsorption-desorption behavior in mollisols(G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2009-07) Raju; Srivastava, AnjanaBenfuracarb is a synthetic carbamate insecticide, having potential against a number of insect pests in vegetable crops. Persistence of benfuracarb 40% EC was determined in soil and brinjal fruit at two rates of application (0.25 and 0.50 µg g-1). The residue analysis was done by high performance liquid chromatography with UV detection. In soil half life value of benfuracarb was 3.54 days at lower rate of application (0.25 µg g-1) and 3.75 days at higher rate of application (0.50 µg g-1) and in brinjal half life value of benfuracarb was 3.90 days at lower rate of application (0.25 µg g-1) and 4.73 days at higher rate of application (0.50 µg g-1). The persistence of benfuracarb in soil and brinjal fruit was found to conform to monophasic first order kinetics. Adsorption-desorption processes of benfuracarb in two mollisols were also investigated using batch method. Adsorption of benfuracarb occurred in two distinct phases, an initial rapid phase upto 4h followed by a latter slower phase which continued for 48h. Both adsorption phases conformed to first order kinetics. The initial rapid adsorption rate coefficient (k1) was higher for silt loam than loam soil while the adsorption rate coefficient for latter slower phase (k2) were statically similar for these two soils. The adsorption maximum (Xmax) value was higher for silt loam than loam. Adsorption-desorption data of benfuracarb at varying concentration could be accounted by Freundlich isotherm. The computed values of adsorption (log K), desorption (log K´) capacities and hysteresis index (H) of benfuracarb were higher for silt loam than loam soil.
