Persistence and dissipation of forchlorfenuron residues in soybean

Abstract

An experiment was conducted on research field at A block, Director of Farm, MPKV, Rahuri to study the persistence and dissipation of plant growth regulator (PGR), forchlorfenuron in/on soybean. Single application of forchlorfenuron was given at the pod initiation stage at different concentrations i.e. 1.25 ppm, 2.50 ppm and 5.0 ppm by knapsack sprayer fitted with flood jet nozzle. The samples of leaves, green pods, dry pods, seed straw and soil were analysed and residues were estimated on HPLC with PDA detector at AINP on Pesticide Residues, Department of Entomology, MPKV, Rahuri (Maharashtra). The results revealed that mean initial residues of forchlorfenuron @ 1.25, 2.50 and 5.00 ppm were found to be 0.119, 0.224 and 0.390 mg/kg. Initial residues dissipated to BQL on 3, 5 and 7 days at 1.25, 2.50 and 5.00 ppm dose, respectively. Forchlorfenuron residues were found to be BQL in green pods, dry pods, seed, straw and soil samples