关键词: 移栽稻田; 除草剂; 土壤处理; 茎叶喷雾; 杂草防效

Abstract: 【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.

Key words: transplanted paddy field; herbicides; soil treatment; stem and leaf spray; control effect on weeds