Abstract
The degradation of imazapyr, flumetsulam and thifensulfuron applied at 500, 40 and 30 g/ha respectively to a silt loam soil was studied under laboratory conditions. Herbicide residues were analysed by a lentil (Lens culinaris) bioassay. Results showed that temperature had a significant effect on herbicide degradation, while the impact of soil organic matter and pH were less well defined. Half-lives for imazapyr, flumetsulam and thifensulfuron in the soil with low organic carbon (3.5%) at 15 oC were 155, 70 and 6.4 days respectively and 77, 24 and 4.8 days at 30oC. In the soil with high organic carbon (6.4%) half-lives were 125, 88 and 5.4 days respectively at 15oC and 69, 30 and 3.8 days at 30oC.
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