Volume 1, Issue 2

Determination of Cypermethrin, Chlorpyrifos and Diazinon Residues in Tomato and Reduction of Cypermethrin Residues in Tomato Using Rice Bran
Original Research
The present study was an attempt to address the health hazard which posed by the ingestation of pesticide residues contained in tomato. Fourteen tomato samples were randomly selected from different shops of local markets of Savar Upazila, Bangladesh and analyzed to identify the level of widely applied cypermethrin, chlorpyrifos and diazinon residues by using high performance liquid chromatography (HPLC) technique. It was found that out of 14 samples, five were found contaminated with cypermethrin and one with chlorpyrifos, but none residue of diazinon was detected in any of the tested samples. Only 7% of the samples were found contaminated with cypermethrin insecticide residue which was above the maximum residue level (MRL) adopted by the FAO/WHO Codex Alimentarius Commission (CAC), although cypermethrin (0.065 ± 0.07mg/kg) and chlorpyrifos (0.024 ± 0.041mg/kg) residues were detected in samples. Rice bran rubbing, a cheap decontamination technique, was used to treat applied cypermethrin residues. 0.45 mg/kg of cypermethrin spiked tomato samples were rubbed by rice bran paste for 5, 10 and 15min. Two experiments were conducted for assessing the efficiency of the adsorbent. Rubbing with rice bran paste for 10min, removed 97.73% and 97.4% in both trails, and whereas cypermethrin residue was not detected in tomato samples treated for 15 min. The removal efficiency was 97.56 ± 0.22% with the adsorbent rice bran rubbing for 10min. The result showed that cypermethrin residues of tomato sample could easily be decontaminated through absorption of rice bran.
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World Journal of Agricultural Research. 2013, 1(2), 30-35. DOI: 10.12691/wjar-1-2-2
Pub. Date: May 15, 2013
25440 Views10916 Downloads35 Likes3 Citations
Effectiveness of Repeated Reduced Rates of Selective Broadleaf Herbicides for Postemergence Weed Control in Sugar Beet (Beta Vulgaris)
Original Research
Field experiments were conducted at three sites (Karaj, Mashhad and Orumieh, Iran), during 2005 to determine the influence of reduced rates of broadleaf herbicides in different combinations on sugar beet and weeds. Experiments were laid out in a randomized complete block design with factorial arrangement of the treatments and three replications. The treatments were 10 different combined herbicides that applied at recommended (full rates) and reduced rates (half rates). Data were recorded 30 days after herbicide application on percentage of weed density and biomass reductions. The data for individual traits were subjected to the ANOVA technique and significant means were separated by the 's multiple range test. The analysis of the data showed that herbicide combinations and herbicide doses were statistically significant for all the parameters investigated except weed frequency reduction at and Orumieh. The interaction of herbicide combinations and doses could not reach the level of significance in any of the traits examined. The results indicated more efficacies of herbicides combinations when they used repeatedly in low-than labeled dose.
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World Journal of Agricultural Research. 2013, 1(2), 25-29. DOI: 10.12691/wjar-1-2-1
Pub. Date: May 09, 2013
17754 Views8137 Downloads32 Likes2 Citations