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江苏省水稻直播田杂草约有22科35属41种和1变种,稗草等15种为优势种群,杂草群落中各种群的组成及其比率随地区、时间及耕作栽培制度的变化而变化。杂草于水稻播种后3~4 d开始出土,第10~20 d达到出土高峰,第25~40 d又出现一个较小的出草高峰。禾本科杂草出土较早,莎草和部分阔叶草出土最迟。直播稻田杂草的综合防除要贯彻“化学防治为主,农业措施为辅”的原则,化除的关键是“一除二封三杀四补”。新野(丁.恶)、扫特、速除(异丙.丁.苄)、杀草丹、千金、二氯.苄对直播稻田杂草具有较好的防除效果。
There were 22 species, 35 genera, 41 species and 1 variety of weeds in direct seeding rice fields in Jiangsu Province. Fifteen species of barnyardgrass and other weeds were the dominant species. The composition and ratio of each species in weed communities varied with time, region and farming system And change. Weeds began unearthed 3 to 4 days after rice sowing, reached the peak of unearthed on the 10th ~ 20th day, and a smaller peak of grasshopper occurred on the 25th ~ 40th day. Grass weeds unearthed earlier, sedge and some broadleaved unearthed at the latest. The comprehensive prevention and control of weeds in direct-seeded rice should carry out the principle of “chemical prevention and control supplemented by agricultural measures”, and the key to eliminating and eliminating is to “eliminate one, two, three and kill four supplements.” Xinye (Ding evil), Sweater, speed addition (Isopropyl Ding. Benzyl), herbicide Dan, daughter of gold, dichlorobenzyl had better control effect on weeds in direct-seeded rice fields.