- Fate and behaviour of flupyrsulfuron-methyl in soil and aquatic systems
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The environmental fate of [14C] flupyrsulfuron-methyl, a sulfonylurea herbicide, was investigated in soil and aquatic systems. The major degradative pathways in both systems were contraction of the sulfonylurea bridge followed by intramolecular rearrangement (at pH > 7) or sulfonylurea bridge hydrolysis (at pH 50 3-6 days), degradation being faster in the aerobic aquatic systems than in sterile buffers. Degradation in aerobic soils was rapid, both in the laboratory (DT50 8-26 days) and in the field (DT50 6- 11 days, DT90 35-123 days). In laboratory studies the rate of degradation in soil reduced with decreasing temperature (rate at 10°C half that at 20°C) but was unaffected by soil water content (50% vs 70% maximum water holding capacity). The compound was degraded in flooded anaerobic soils (DT50 33 days). Flupyrsulfuron-methyl was weakly absorbed to soils, there being a linear relationship between adsorption and soil organic carbon content. Following application of [14C]flupyrsulfuron-methyl to bare field soil the radioactivity moved little, with very little radioactivity found in soil below 60 cm from the surface.
- Singles,Dean,Kirkpatrick,Mayo,Langford-Pollard,Barefoot,Bramble F.Q.
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p. 288 - 300
(2007/10/03)
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- Herbicidal pyridine sulfonamide
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A pyridine sulfonylurea herbicide, composition thereof and a method for its use that results in the control of blackgrass in cereal crops and general control of all plant growth.
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