新疆移栽稻田杂草不同防除方式药效评价

【目的】通过水稻移栽前土壤封闭处理和移栽后茎叶喷雾处理,筛选对移栽稻田杂草具有较好防效的除草剂,为安全高效应用除草剂提供依据。【方法】采用随机区组的方法,定点取样调查各处理小区的杂草株数、鲜重,评价供试药剂对杂草防除效果及对移栽水稻安全性。【结果】40%五氟·丁草胺悬浮剂750 g a.i./hm²+30%苄嘧磺隆可湿性粉剂67.50 g a.i./hm²、500 g/L丙草胺乳油525 g a.i./hm²+30%苄嘧磺隆可湿性粉剂67.50 g a.i./hm²和60%丁草胺乳油1 260 g a.i./hm²+30%苄嘧磺隆可湿性粉剂67.50 g a.i./hm²在水稻移栽前进行土壤封闭处理,20 d后施用25 g/L五氟磺草胺可分散油悬浮剂30 g a.i./hm²+30%苄嘧磺隆可湿性粉剂45 g a.i./hm²进行茎叶喷雾处理,对移栽稻田一年生杂草的株防效均在89%以上,鲜重防效在97%以上。仅施用3%氯氟吡啶酯乳油36 g a.i./hm²进行茎叶喷雾处理,药后45 d对稗草和空心莲子草的防效达到100%,对移栽稻田一年生杂草的株防效和鲜重防效均在91%以上。【结论】针对稻田扁秆藨草、稗草和空心莲子草危害为主的田块,可选用500 g/L丙草胺乳油或40%五氟·丁草胺悬浮剂或60%丁草胺乳油与30%苄嘧磺隆可湿性粉剂混配进行土壤处理,且20 d后选用25 g/L五氟磺草胺可分散油悬浮剂+30%苄嘧磺隆可湿性粉剂进行茎叶喷雾处理。若不进行土壤封闭处理的田块,针对稗草和空心莲子草危害为主的田块,可选用3%氯氟吡啶酯乳油进行茎叶喷雾防除。

Efficacy Evaluation of Different Weed Control Methods for Transplanted Paddy in Xinjiang

【Objective】 The aim of the present study is to screen herbicides with better control effect on weeds of transplanted paddy field through closed soil treatment before transplanting and spraying treatment with stems and leaves after transplanting in order to provide guidance for scientific, safe and efficient application of such herbicides. 【Method】Randomized block design was used to research the number and the fresh weight of weeds at fixed spots, and the effect of herbicides on weeds and safety to transplanted paddy was evaluated.【Result】40% Penoxsulam Machette SC 750 g a.i./hm² +30% bensulfuron methyl WP 67.50 g a.i./hm², 500 g/L pretilachlor EC 525 g a.i./hm²+30% bensulfuron methyl WP 67.50 g a.i./hm² and 60% butachlor EC1260 g a.i./hm²+30% bensulfuron methyl WP67.50 g a.i./hm² were used for soil treatment before transplanting rice, and after 20 days, 25 g/L penoxsulam OD 30 g a.i./hm²+30% bensulfuron methyl WP 45 g a.i./hm² was used for spray treatment, which the control effect on annual weeds in transplanted paddy fields was above 89%, and the control effect of fresh weight was over 97%. After 45 days, 3% florpyrauxifen EC 36 g a.i./hm² was used for stem and leaf spray treatment, the control effect on echinochloa crusgalli and alternanthera philoxeroides was 100%, and the plant and fresh weight control of annual weeds in transplanted paddy fields were above 91%.【Conclusion】In the paddy field, the damage of scripus planiculmis, echinochloa crusgalli and alternanthera philoxeroides is the main damage to the field. Soil treatment can be carried out by mixing 500 g / L propachlor EC or 40% pentafluoro-butachlor suspension or 60% butachlor EC with 30% benzyl sulfamethasone wettable powder. If the soil is not treated with herbicides, 3% florpyrauxifen EC can be used to control echinochloa crusgalli and alternanthera philoxeroides.