4种除草剂对直播水稻田主要杂草的田间药效

Field Efficacy of Four Herbicides on Main Weeds in Direct Seeding Rice Fields

通过田间试验比较了20%双草醚可分散油悬浮剂、20%唑·氰氟乳油、30%氰氟草酯·唑酰草胺可分散油悬浮剂、20%嗪草酮可分散油悬浮剂对直播水稻田主要杂草的防治效果,并对水稻安全性进行评价。结果表明20%唑·氰氟乳油、30%氰氟草酯·唑酰草胺可分散油悬浮剂对水稻直播田千金子、莎草科杂草均有很好的防效,但对阔叶杂草防效差;20%双草醚可分散悬浮剂、20%嗪草酮可分散油悬浮剂对水稻直播田禾本科杂草防治效果显著。20%唑·氰氟乳油120 mL/667 m^(2)处理对水稻产生轻微药害,其余处理均对水稻安全。30、45 d的株防效或鲜重防效、水稻增产率、药害情况数据表明,20%双草醚可分散油悬浮剂24 mL/667 m^(2)适于直播水稻茎叶处理,其45 d的株防效、鲜重防效、增产率分别为94.89%、94.86%、16.13%。20%唑·氰氟乳油70 mL/667 m^(2)对千金子、莎草防效比较突出,适于直播稻田二次补充防除千金子、莎草。

Field trial was conducted to compare control effect of tested herbicides on main weeds and their selectivity to rice,including bispyribac-sodium 20%OD,oxazole·cyanoflurane 20%EC,cyhalofop-butyl·oxaflufen 30%OD,and oxaziclomefone 20%OD.The results showed that oxazole·cyanoflurane 20%EC and cyhalofop-ethyl·foxachlor 30%OD had good control effects on Leptochloa chinensis and Cyperaceae weeds but poor to broadleaf weeds in direct-seeded rice fields.Bispyribac-sodium 20%OD and oxaziclomefone 20%OD had significant control effect on Gramineous weeds and broadleaf weeds in direct-seeded rice fields.The treatment with 20%oxazole·cyanofluoride EC(120 mL/667 m^(2))caused slight phytotoxicity to rice,and the other treatments were selectivity to rice.Combining the datum of control effect on plant and(or)fresh weight,rice yield increasing rate,and phytotoxicity at 30,45 days,bispyribac-sodium 20%OD(24 mL/667 m^(2))is suitable for stems and leaves of direct-seeded rice.The plant and fresh weight control efficiency and yield increasing rate were 94.89%,94.86%,and 16.13%at 45 days,respectively.The application rate of oxazole·cyanofluoroe 20%EC(70 mL/667 m^(2))had an outstanding control effect on L.chinensis and L.cyperus rotundus,and is suitable for secondary supplementation in direct-seeded rice fields.