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1996～ 2 0 0 0年在浙江省水稻直播田开展了杂草发生规律调查和农美利应用技术研究。调查表明 ,浙江省水稻直播田杂草共 4 1科 77属 131种和 2变种。根据杂草发生频率、密度和危害综合分析 ,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而变化。杂草于水稻播种后 3～ 4d开始出土 ,至第 7d(单季晚稻 )或第 15～ 2 1d(早稻 )达到高峰 ,第 4 2～ 70d时又出现一个较小的出草高峰。禾本科草出土较早 ,其次为阔叶草 ,莎草和部分阔叶草出土最迟。田间试验表明 ,农美利、扫特、杀草丹、去稗安、拜田净、千金、威霸、二氯·苄对直播稻田杂草具有优异的防除效果。
From 1996 to 2000, we conducted a survey on weed occurrence in rice direct seeding fields in Zhejiang Province and a study on its application technologies. The survey showed that there were 121 species and 77 varieties of 77 genera and 41 families of rice direct seeding weeds in Zhejiang Province. According to the comprehensive analysis of frequency, density and hazard of weeds, 15 species of barnyardgrass were the dominant species. The composition and proportion of each species in the weed community varied with the region, time and cultivation and cultivation system. The weeds began to be excavated 3 to 4 days after sowing, reaching the peak on the 7th day (single season late rice) or the 15th to 21st day (early rice), and a smaller peak appeared on the 4th to the 70th day. Gramineae grass unearthed earlier, followed by broad-leaved grass, sedge and some broadleaved unearthed at the latest. Field trials showed that the control of weeds in direct-seeded rice fields was excellent with the use of Nongmeili, Swede, Ketanosole, Propamocarb, Bai Tian Jing, Qian Jin, Wei Pa, and Dichlorobenzuron.