砜吡草唑及其与不同除草剂混用对冬小麦田杂草防除效果OA

[Objective]The effects of single pyroxasulfone and pyroxasulfone mixed with different herbicides on weed control in wheat field and safety of wheat growth were investigated to screen efficient mixed herbicides against weeds in wheat fields and provide a reference for scientific prevention and control of weeds in wheat fields.[Method]The effects of 40%pyroxasulfone SC(T1),6%cypyrafluone OD(T2),41%diflufenican SC(T3),50 g/L florasulam SC(T4),40%pyroxasulfone SC+6%cypyrafluone OD(T5),40%pyroxasulfone SC+41%diflufenican SC(T6),40%pyroxasulfone SC+50 g/L florasulam SC(T7),hand weeding(T8)and blank control(T9)on control efficiency of weed plant number and fresh weed weight,and wheat yield were determined to evaluate the weed control efficiency and wheat safety of different herbicides and herbicide combinations.[Result]There were no significant differences in control efficiency of weed plant number and fresh weed weight on 100 d after application of herbicides among T1,T2,T3 and T4.40%pyroxasulfone SC(T1)still had a good control effect(63.01%)on weed community,and a relative poor control effect(39.46%)on fresh weed weight.The control effect of 40%pyroxasulfone SC mixed with different herbicides(T5,T6 and T7)on weed plant number on 100 d after application of herbicides was 9.19-25.00 percentage points higher than that of single 40%pyroxasulfone SC(T1)but there was no significant difference among T5,T6 and T7.The control effect of T5,T6 and T7 on fresh weed weight was 35.94-46.46 percentage points higher than T1,and the control effect of T5 and T7 on fresh weed weight was significantly higher than T1.The control effects of T5 with an excellent weed community control effect by improving the control effect of broadleaf weeds on weed plant number and fresh weed weight reached 88.01%and 82.02%.The control effect of T6 and T7 on weed plant number was improved by expanding herbicide controlling spectrum of gramineous weeds and their control effects on weed plant number and fresh weed weight were 82.84%and 75.40%,and 72.20%and 85.92%respectively.All tested herbicides and herbicide combinations had no significant difference in wheat yield and no harm to safe growth of wheat plants.[Conclusion]The control efficiency of pyroxasulfone SC with a long-lasting period against weeds in wheat fields is better than cypyrafluone,diflufenican and florasulam.The combinations of pyroxasulfone SC mixed with cypyrafluone,diflufenican and florasulam with a long-lasting period can expand their herbicide controlling spectrum and improve their comprehensive weed control efficiency and have no harm to safe growth of wheat plants.When grass weeds dominate in the field,a mixture of cypyrafluone and pyroxasulfone is recommended.For fields where broadleaf weeds are the dominant problem,a mixture of diflufenican and pyroxasulfone should be prioritized.