3种除草剂对甘薯田杂草的田间防效试验

为明确乙草胺、乙氧氟草醚、二甲戊乐灵3种除草剂对甘薯的安全性和对甘薯田杂草的防治效果，进行了田间小区试验。结果表明：各处理对甘薯安全，综合30、45d调查结果，喷洒50％乙草胺乳油4500mL／hm^2对禾本科杂草株防效较好；喷洒24％乙氧氟草醚乳油1500mL／hm^2对阔叶杂草防效较好；喷洒50％乙草胺乳油4500mL／hm^2、24％乙氧氟草醚乳油750mL／hm^2和24％乙氧氟草醚乳油1500mL／hm^23个处理对杂草的综合防效较好。30d综合株防效分别为73．05％、65．55％、83．81％；45d综合株防效分别为86．26％、84．54％、88．81％，鲜重防效分别为92．90％、97．11％、97．80％，可有效防除甘薯田杂草。

Field Efficacy of Three Herbicides in a Sweet Potato Field

Field plot experiments were conducted to evaluate the efficacy and selectivity of acetochlor, oxyfluorfen, and pendimethalin in sweet potato,. All treatments were selective to sweet potato. Acetochlor 50% EC （4 500 mL/hm^2 ） better controlled Grarnineae weeds 30 d and 45 d after spraying whereas oxytluorfen 24% EC （ 1 500 mL/hm^2 ） was more effective on broadleaf weeds. Acetochlor 50% EC （4 500 mL/hm^2 ） and oxyfluorfen 24% EC at 750 mL/hm^2 and 1 500 mL/hm^2 at 30 days after application provided 73% ,66%, and 84% weed control, which increased to 87%, 84%, and 89% at 45 days, respectively. Based on fresh weight the respective control levels were 93% ,97% , and 98%. Both herbicides effectively, controlled weeds in sweet potato fields.