Abstract: Standard and reduced rates of fenoxaprop[ethyl 2-(4-(6-chloro-2- benzoxazolyloxy)-phenoxy) propanasate]was applied singly, sequentially and following propanil (3',4'-dichloropropionamilide) at different growth stages of rice and weeds to compare standard and reduced rates of the herbicide treatments for control of barnyardgrass(Echinochloa crusgalli (L.)Beauv.),bearded sprangletop(Leptochloa fascicularis(Lam.)Gray), rice flatsedge (Cyperus iria L.), red-root flatsedge(Cyperus erythrorhizos), and Eclipta(Eclipta alba(L.) Hassk)in rice(Oryza sativa L. cv. Tebonnet). Excellent control of all weeds and the highest grain yield were obtained with early post-emergence(2-leaf barnyardgrass) treatment of propanil at 3.4 kg ai/ha followed by fenoxaprop at reduced rates of 0.08 and 0.11kg ai/ha ap- plied to rice in the three-leaf stage. Fenoxaprop applied singly or sequentially controlled barnyardgrass and bearded sprangletop, but failed to control flatsedges or Eclipta. Rice plants injury was slight to moderate with standard and reduced rates of fenoxaprop, the crop recovered by 19 days after treatment.

Key words: Herbicide, Weed control, Rice

摘要： 为了比较常规剂量和低剂量除草剂对稻田稗草、丛生千金子、碎米莎草、红根莎草和鳢肠的防除效果及其对产量的影响,在水稻和杂草的不同生长阶段以常规剂量和低剂量(口恶)草丙分别作单、连续和结合敌稗复合式处理。早期使用敌稗,随后在水稻3叶期使用低剂量(口恶)草丙0,08或0.11kgai/ha 处理,均获得优级杂草防除率和最高水稻产量。(口恶)草丙单一或连续使用能有效防除稗草和丛生千金子,但不能防除莎草和鳢肠。(口恶)草丙低剂量和常规剂量处理分别发生轻微和中度水稻植株损伤,但处理后19天,水稻恢复正常。

关键词: 除草剂, 杂草防除, 水稻