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Subject: Chemistry × Author: Dhanker, Preeti × End date: 2018 × Start date: 2010 × Thesis Type: M.Sc ×
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    ThesisItemOpen Access
    Persistence study of tebuconazole in chilli and soil
    (CCSHAU, 2017) Dhanker, Preeti; Sushil
    Increasing awareness of the potential impact of persistent crop protection agents has led to the development of ecofriendly new molecules to ensure minimum risk to man and environment. Tebuconazole a representative of the triazole fungicide effective in controlling soil-borne and foliar fungal pathogens, and has been credited with increasing yields above the levels provided by other widely used fungicides. Keeping in view all these observations, persistence study of Tebuconazole was carried out following single application of Folicur 25.9 EC on chilli crop. For this purpose a field experiment was carried out@ single (125 g a.i. ha−1) and double dose (250 g a.i. ha−1) with Knap sap sprayer in plots of size 3 × 3 m size along with a control plot where no pesticide was applied in a randomized design (RBD).Samples of chilli fruit were processed using liquid- liquid partitioning method and residues were analysed on GC- MS, with retention time at 17.9 and major ions 153, 125, 70. The average Initial deposits of Tebuconazole were found to be 0.21 and 0.44 mg kg-1, at single and double dose, on 0 day (1 hr after spray), respectively. Tebuconazole residues reached below detectable limit (BDL) of 0.01 mg kg−1 after 5 and 7 days, respectively, at single and double the application dosages. Soil samples collected after harvest were found to be BDL. Effect of washing on Tebuconazole residues reduction with tap water and 5% NaCl solution were also studied and washing with 5% NaCl solution was found to be more effective as it causes the reduction upto 70% at both the doses.