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Soil Metabolism of Flupyrsulfuron in Winter Wheat Crops by J ROUCHAUD; C MOULARD; H EELEN; R BULCKE is a Agricultural and Biological Sciences article available to read on EtoBox.

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The sulfonylurea herbicide flupyrsulfuron was applied post‐emergence in March at the rate of 10 g a.i. ha^−1^ on winter wheat crops. In the 0–8 cm surface soil layer of the crops grown on sandy loam and loam soils, the flupyrsulfuron half‐life was 64 and 40 days respectively. Flupyrsulfuron and its metabolites were not detected during both crops or 1 month after crop harvest in the 8–15 and 15–20 cm soil layers. Soil degradation of flupyrsulfuron successively generated the cyclization products 1‐(4,6‐dimethoxypyrimidine‐2‐yl)‐2,4‐diketo‐7‐trifluoromethyl‐1,2,3,4‐tetrahydropyrido[2,3‐d]pyrimidine **2** and N‐(4,6‐dimethoxypyrimidine‐2‐yl)‐N‐(3‐methoxycarbonyl‐6‐trifluoromethylpyridine‐2‐yl)‐amine **3**, which were the main metabolites of flupyrsulfuron in soil. Hydrolysis of **3** successively generated N‐(4,6‐dimethoxypyrimidine‐2‐yl)‐N‐(3‐car‐ boxylic acid‐6‐trifluoromethylpyridine‐2‐yl)‐amine **4** and N‐(4‐methoxy‐6‐hydroxypyrimidine‐2‐yl)‐N‐(3‐carboxylic acid‐6‐trifluoromethylpyridine‐2‐yl)‐amine **5**. Low and temporary concentrations of 2‐sulfonamido‐3‐carbomethoxy‐6‐trifluoromethyl‐pyridine **6** and 2‐amino‐4,6‐dimethoxypyrimidine **7** were observed. Bioassays with sugarbe

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Author

J ROUCHAUD; C MOULARD; H EELEN; R BULCKE

Publisher

John Wiley and Sons; Wiley (Blackwell Publishing); Blackwell Publishing Inc.; Wiley (ISSN 0043-1737)

Published

2002

Language

EN

Field

Agricultural and Biological Sciences (Life Sciences)