40%砜吡草唑悬浮剂防除小麦田杂草应用技术研究

Application of pyroxasulfone 40%SC against weeds in wheat field

为明确40%砜吡草唑悬浮剂在小麦田的应用技术,采用土壤喷雾法评价40%砜吡草唑悬浮剂对小麦田杂草的防除效果及对小麦的安全性。结果表明:40%砜吡草唑悬浮剂对小麦田杂草具有较好的防效,持效期达120 d以上,对禾本科杂草的防效优于对阔叶杂草的防效。施药后120 d,40%砜吡草唑悬浮剂150~360 g a.i./hm^(2)对禾本科杂草看麦娘和菵草的株防效和鲜重防效均大于95%,对阔叶杂草荠菜和牛繁缕的株防效分别为90.1%~96.3%和80.4%~85.5%,鲜重防效分别为93.6%~95.4%和83.2%~88.4%。40%砜吡草唑悬浮剂150~360 g a.i./hm^(2)对小麦出苗和生长安全,对小麦增产明显,增产率为16.3%~17.5%。40%砜吡草唑悬浮剂是防除小麦田杂草的优良除草剂,推荐施用剂量为150~180 g a.i./hm^(2),适宜施用时期为小麦播种后出苗前。

To determine the application of pyroxasulfone 40%SC in wheat field,experiment was conducted to evaluate the control efficacy of pyroxasulfone 40%SC against weeds and its safety to wheat.The results showed that pyroxasulfone 40%SC had good control efficacy against weeds in wheat field,and the control efficacy on gramineae weeds was better than that on broad-leaved weeds,and the effect lasted for more than 120 days.At 120 days after application,the plant control efficacy and fresh weight control efficacy of pyroxasulfone 40%SC applied at 150-360 g a.i./ha on Alopecurus aequalis and Beckmannia syzigachne were more than 95%.The plant control efficacy on Capsella bursa-pastoris and Stellaria aquatica were 90.1%-96.3%and 80.4%-85.5%respectively,and the fresh weight control efficacy were 93.6%-95.4%and 83.2%-88.4%,respectively.Pyroxasulfone 40%SC applied at 150-360 g a.i./ha was safe for wheat emergence and growth,and increased the wheat yield by16.3%-17.5%.Pyroxasulfone 40%SC is an excellent herbicide to control weeds in wheat field,the recommended dosage is150-180 g a.i./ha,and the suitable application period is before emergence of wheat after sowing.