It can be used for the weeding in soybean and the reagent amount is 60-90g(a.i.)/hm2,mu amount is 4-6g(a.i.). It is safe ot the

oxasulfuronHerbicide HRAC B WSSA 2; sulfonylurea NOMENCLATURE Common name oxasulfuron (BSI, pa ISO) IUPAC name oxetan-3-yl 2-[(4,6-dimethylpyrimidin-2-yl)-carbamoylsulfamoyl]benzoate Chemical Abstracts name 3-oxetanyl 2-[[[[(4,6-dimethyl-2-pyrimidinyl)amino]carbonyl]amino]sulfonyl]benzoate CAS RN [144651-06-9] Development codes CGA-277476 (Ciba-Geigy) PHYSICAL CHEMISTRY Mol. wt. 406.4 M.f. C17H18N4O6S Form White, odourless powder. M.p. 158 C (decomp.) V.p. 5000 mg/kg. Skin and eye Acute percutaneous LD50 for rabbits >2000 mg/kg. No skin or eye irritation (rabbits). Not a skin sensitiser (guinea pigs). Inhalation LC50 for rats >5.08 mg/l air. NOEL (2 y) for rats 8.3 mg/kg b.w. daily; (18 mo) for mice 1.5 mg/kg b.w. daily; (1 y) for dogs 1.3 mg/kg b.w. daily. ADI 0.013 mg/kg b.w. Other Non-mutagenic. Toxicity class WHO (a.i.) III (Table 5) ECOTOXICOLOGY Birds Acute oral LD50 for quail and mallard ducks >2250 mg/kg. Dietary LC50 for quail and mallard ducks >5620 ppm. Fish LC50 for bluegill sunfish >111, trout >116 mg/l. Daphnia EC50 (48 h) >89.4 mg/l. Algae EC50 for Selenastrum capricornutum 0.145, Navicula >20 mg/l. Bees LD50 >25 mg/bee. Worms LC50 for earthworms >1000 mg/kg. ENVIRONMENTAL FATE Animals The majority (70-80%) of the applied dose is excreted in urine with no accumulation in tissues; depletion t?c. 7-14 h. The metabolic route involves hydroxylation of the pyrimidine methyl, hydrolysis of the oxetane ring and cleavage of the sulfonylurea bridge. Plants The major metabolite is saccharine (0.002 ppm in mature beans); small amounts of oxetane alcohol are also formed. Metabolism follows a similar route to animals. Soil/Environment Soil DT50 (lab.) 10 d, (field)

Oxasulfuron75%WDG