Goh, Wei Ling (2007) Residue levels of chlorpyrifos in leaf mustard (Brassica juncea (L) Coss.) in relation to sampling time. [Project Paper] (Submitted)
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Abstract
An experiment was conducted in the netted greenhouse at the share farm in Universiti Putra Malaysia Bintulu Campus to study leaf residue levels of the insecticide chlorpyrifos used to control insect pests in leaf mustard (Brassica juncea (L.) Coss.). There were 3 treatments in 4 replicates, 0.46 kg/ha, 0.92 kg/ha and an untreated control. Leaf samples for residue analysis were harvested at 8, 14 and 20 days after treatment. Chlorpyrifos residue levels in the leaf samples were determined by HPLC (ModelJ asco ), fitted with an lnertsil ODS-3 (5 µm, 4 mm x 150 mm length) column with PDAwavelength detector. Insect damage assessment was determined at 13 and 18 days after treatment to evaluate effectiveness of the treatments. Insect damage was significantly different between the control and insecticide treatments. Results obtained indicate that chlorpyrifos residue levels in leaf mustard were not detected in all samples at 8, 14 and 20 days after treatment. This suggests that a single application of chlorpyrifos at 3 weeks after planting should not leave any residues in the leaves harvested after 4 weeks from planting.
| Item Type: | Project Paper |
|---|---|
| Faculty: | Faculty of Agriculture and Food Sciences |
| Depositing User: | Mr. Azman Mohamad |
| Date Deposited: | 17 Dec 2024 02:35 |
| Last Modified: | 17 Dec 2024 02:35 |
| URI: | http://psaspb.upm.edu.my/id/eprint/2265 |
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