不同封闭除草剂对甘薯田杂草的防除效果

[目的]探索适合南方薯区甘薯移栽后封闭除草方法。[方法]利用不同用量的二甲戊灵和乙草胺对移栽后甘薯田进行喷施处理,对杂草防除效果和甘薯药害进行了调查和分析。[结果]2种除草剂对甘薯田杂草的防除效果随着用药量的增加而提高,33%二甲戊灵5 025 m L/hm~2处理的防除效果最好,50%乙草胺3 750 m L/hm~2处理次之。甘薯田以阔叶杂草为主,2种除草剂对阔叶杂草的防除效果均较好。2种除草剂只有在高浓度下产生苗期药害,但在甘薯旺长期药害症状全部消失,对甘薯生长无明显影响。[结论]为秋冬薯区的甘薯田杂草防除技术研究提供了理论依据。

Control Efficacy of Closed Herbicides on Weeds in Sweet Potato Field

Objective] To explore the suitable weeding method after moving plant.[Method] The two soil herbicides of pendimethalin and acetochlor about weed control and safety were experimented in autumn and winter in sweet potato field.[Result] Pendimethalin and acetochlor had good control efficacy on weeds with high concentration.5 025 mL/hm2 of 33% pendimethalin had the best control efficacy, followed with 3 750 mL/hm2 of 50% acetochlor.Two kinds of herbicides both had control effect on broadleaved weeds which the most weeds in sweet potato field.Phytotoxicity and acetochlor both caused phytotoxicity to sweet potato in high concentration, but the phytotoxicity disappeared after sev-eral weeks;two kinds of herbicides did cause hurt.[ Conclusion] This research provides theoretical references for the weeds control technology in sweet potato field.