850 g/kg砜吡草唑WG对玉米田杂草防除效果及对不同作物安全性评价

Control Effect of Pyroxasulfone 850 g/kg WG on Weeds in Corn Field and Safety Evaluation of Different Crops

[目的]探索砜吡草唑对春玉米田杂草防除效果及合理剂量,以及对不同作物安全性评价。[方法]设计田间小区试验,以土壤喷雾处理,绝对值调查法统计防效,对作物安全性进行药害分级。[结果]850 g/kg砜吡草唑WG制剂用量为300 g/hm2,对一年生禾本科杂草防效达90%以上,对恶性阔叶杂草效果差,对绿豆、甜瓜、黄瓜影响依次减弱。制剂用量为600、900 g/hm2对小麦、大豆、花生、马铃薯安全,对高粱、绿豆不安全。[结论]砜吡草唑作为土壤封闭处理剂使用防除效果很好,可作为玉米田化学除草的有效技术手段。

[Aims] This study aims to explore the weed control effect and reasonable dosage of pyroxasulfone in spring maize field, and to evaluate the safety on different crops. [Methods] A field plot experiment was carried out. Soil spray treatment and the absolute value method were used to conduct statistics, and the classification of phytotoxicity was carried out for crop safety. [Results] When the dosage of pyroxasulfone 850 g/kg WG was 300 g/ha, the control effect on annual gramineous weeds was more than 90%, the effect on malignant broad-leaved weeds was poor, and the effect on mung bean, melon and cucumber decreased in turn. The dosage of 600 and 900 g/ha was safe for wheat, soybean,peanut and potato, but not for sorghum and mung bean. [Conclusions] As a soil sealing agent, pyroxasulfone has good control effect, and can be used as an effective technical means of chemical weeding in corn field.