几种除草剂防除直播稻田稗草和千金子的效果

Control Efficacy of several Herbicides on Echinochloa crusgalli and Leptochloa chinensisin Direct Sowing Rice Fields.

试验结果表明，直播早稻芽期每亩用１０％吡嘧黄隆可湿性粉剂１０克、立针期每亩用３０／丙草胺乳油１００毫升、１７．２％哌草丹－苄嘧黄隆可湿性粉剂２００克、一叶一心期亩用３４％二氯喹啉酸－苄嘧黄隆可湿性粉剂２８克、二叶一心期每亩用５Ｏ％二氯喹啉酸可湿性粉剂２５克加１Ｏ％吡嘧黄隆可湿性粉剂１Ｏ克，对稗草和千金子均有理想的防除效果，鲜重防效分别为８８．３～９９．１％和９２．３～１００％，且对水稻安全。

Eight herbicides and its mixtures applied in directsowing early-rice fields were screened. Of these, five herbicidesand its mixtures with appropriate quantity at appropriate stagehad applied value. The result of expreinent showed that,pyrazo-svlfuron-ethyl l0%W.P,at l0g/mu at bud stage,pretilachlor30%E.C. at l00ml/mu, dimepiperate+bepsulfuron rnethyl17.2%W.P. at 200g/mu at conifuantity,qtureslurac+ben-sulfuron methyl 34%W.P. at 28g/mu at l-leaf stage.controlling50%W.P.+pyrazosulfuron-ethyl 10%W.P.at 25g+10/muat 2-leaf stage of rice had signlficant effect of controlling Echinochloa crusgalli and Leptochloa chinensis,the control effi-cacy(fresh weight)of those herbicides and its mixtures eachreached 88.3/─99.1%,92.3─100%.