对海丰地区的机械旱直播稻田杂草发生规律进行调查,并有针对性地选择化学除草药剂进行防除试验,从杂草土壤封闭和茎叶处理两个方面入手,寻求防效最佳的组合药剂.结果表明:330 g/L施田补EC618.75 g a.i./hm2+ 240 g/L果尔EC 126 g a.i./hm2与36％丁噁EC 1 080 g a.i./hm2+ 10％稻无草WP45 g a.i./hm2对机械旱直播稻田播后封闭具有较好的防除效果.36％丁噁EC 1 080 g a.i./hm2在土壤畦面有积水的情况下易产生药害;60 g/L稻喜OD单独使用、480 g/L苯达松AS与10％韩秋好EC复配茎叶处理对杂草具均有良好的防治效果,防除千金子和马唐时韩秋好的剂量需增加至120 g a.i./hm2.%The occurrence of weeds in mechanical direct-seeding rice fields in Haifeng area was investigated.To seek the best combination of herbicides,chemical herbicides were selected for the control experiments from the two aspects of weed soil seal and stem treatment.The results showed that the combination of 330 g/L pendimethalin EC 618.75 g a.i./hm2 and 240 g/L oxyfluorfen EC 126 g a.i./hm2 had the better control effects on weeds by sealing in dry direct-seeding rice field.The combination of 36％ butachlor + oxadiazon EC 1 080 g a.i./hm2 and 10％ bensulfuron methyl WP 45 g a.i./hm2 had similar effects.The treatment with 36％ butachlor + oxadiazon EC 1 080 g a.i./hm2 was liable to phytotoxicity when the soil was covered with water.The treatments of 60 g/L penoxsulam + cyhalofop-butyl used alone or 48％ bentazon AS and 10％ metamifop EC used together had better control effects on weeds by stem treatment.In order to better control moleplant seed and common crabgrass,the dosage of metamifop should be increased to 120 g a.i./hm2.
展开▼
