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为寻求稻田直播油菜田杂草尤其是恶性杂草——酸模的有效防除方法,选择了5种除草剂进行稻田直播油菜田芽前封闭除草试验。结果表明:5种除草剂对稻田直播油菜田杂草均有一定的防效,且各除草剂处理的植株高度、一次分枝数等指标均优于对照,产量也有较大程度的提高,增产幅度在66.1%～96.1%之间;其中,以33%二甲戊灵、80%异恶·异丙甲、75%异松·乙草胺这3种药剂的一次性防除稻田直播油菜田酸模等杂草效果较好,但80%异恶·异丙甲、75%异松·乙草胺对油菜幼苗有一定的药害;而33%二甲戊灵作为芽前封闭除草剂效果较好,尤其是对困扰浏阳市多年的恶性杂草——酸模的防除效果明显,且对油菜出苗、生长无不良影响,建议在湖南地区直播油菜田中推广使用。
In order to seek the effective control of weeds in rape field, especially the weed-acid weeds, five herbicides were selected to control the weeds in front of rape fields. The results showed that all the five herbicides had certain control effects on the weeds in direct seeding rape fields. The herbicide treatments such as plant height, primary branch number and other indexes were better than those of the control and the yield was also increased to a great extent, The range was between 66.1% and 96.1%. Among them, the acid-fast mode of the rapeseed field was controlled by the three kinds of pesticides including 33% pendimethalin, 80% isoprogox, 75% isoprenone and acetochlor And other weeds are better, but 80% of the evil isloxacan, 75% of the abnormal pine · acetochlor on rapeseed seedlings have some phytotoxicity; and 33% of pendimethalin as bud pre-herbicide is better , Especially against Liuyang City, many years of malignant weeds - acid mold control effect is obvious, and no adverse effects on rape emergence, growth, it is recommended to promote the use of direct seeding rape fields in Hunan.