[目的]明确氟啶草酮和扑草净混用后防除棉田杂草的应用潜力。[方法]采用室内盆栽法测定了氟啶草酮和扑草净不同配比组合对棉田恶性杂草龙葵的联合作用,并评价了混配的田间应用效果。[结果]氟啶草酮和扑草净混配对棉田龙葵的联合作用以...[目的]明确氟啶草酮和扑草净混用后防除棉田杂草的应用潜力。[方法]采用室内盆栽法测定了氟啶草酮和扑草净不同配比组合对棉田恶性杂草龙葵的联合作用,并评价了混配的田间应用效果。[结果]氟啶草酮和扑草净混配对棉田龙葵的联合作用以增效作用为主,其中2者质量比在1∶5.76时增效作用最为明显;氟啶草酮和扑草净田间在(144+825) g a.i./hm2剂量下对棉田杂草防效较好,防效可达90.5%以上。[结论]氟啶草酮和扑草净混用对棉花安全,且对棉田杂草防效较高,能降低后茬作物安全性风险,有较好的应用前景。展开更多
The laser frequency could be linked to an radio frequency through an external cavity by the combination of Pound-Drever-Hall and Devoe-Brewer locking techniques.A stable and tunable optical frequency at wavelength of ...The laser frequency could be linked to an radio frequency through an external cavity by the combination of Pound-Drever-Hall and Devoe-Brewer locking techniques.A stable and tunable optical frequency at wavelength of 1.5μm obtained by a cavity with high finesse of 96000 and a fiber laser has been demonstrated,calibrated by a commercial optical frequency comb.The locking performances have been analyzed by in-loop and out-loop noises,indicating that the absolute frequency instability could be down to 50 kHz over 1 s and keep to less than 110 kHz over 2.5 h.Then,the application of this stabilized laser to the direct absorption spectroscopy has been performed.With the help of balanced detection,the detection sensitivity,in terms of optical density,can reach to 9.4×10^(-6).展开更多
文摘[目的]明确氟啶草酮和扑草净混用后防除棉田杂草的应用潜力。[方法]采用室内盆栽法测定了氟啶草酮和扑草净不同配比组合对棉田恶性杂草龙葵的联合作用,并评价了混配的田间应用效果。[结果]氟啶草酮和扑草净混配对棉田龙葵的联合作用以增效作用为主,其中2者质量比在1∶5.76时增效作用最为明显;氟啶草酮和扑草净田间在(144+825) g a.i./hm2剂量下对棉田杂草防效较好,防效可达90.5%以上。[结论]氟啶草酮和扑草净混用对棉花安全,且对棉田杂草防效较高,能降低后茬作物安全性风险,有较好的应用前景。
基金supported by the Scientific Research Innovation Project in Xinjiang Uygur Autonomous Region(No.XJGRI2017045)the National Students Innovation and Entrepreneuship Training Program(No.201810759055)+1 种基金the Program for Changjiang Scholars and Innovative Research Team in University(No.IRT15R46)the Yangtze River Scholar Research Project of Shihezi University(No.CJXZ201601)~~
基金supported by the National Key R&D Program of China(Grant No.2017YFA0304203)the National Natural Science Foundation of China(Grant Nos.61875107,61905136,61905134,62175139)+1 种基金Scientific and Technological Innovation Programs of Higher Education Institutions in Shanxi,China(Grant No.2019L0062)Opening Foundation of Key Laboratory of Laser&Infrared System(Shandong University)。
文摘The laser frequency could be linked to an radio frequency through an external cavity by the combination of Pound-Drever-Hall and Devoe-Brewer locking techniques.A stable and tunable optical frequency at wavelength of 1.5μm obtained by a cavity with high finesse of 96000 and a fiber laser has been demonstrated,calibrated by a commercial optical frequency comb.The locking performances have been analyzed by in-loop and out-loop noises,indicating that the absolute frequency instability could be down to 50 kHz over 1 s and keep to less than 110 kHz over 2.5 h.Then,the application of this stabilized laser to the direct absorption spectroscopy has been performed.With the help of balanced detection,the detection sensitivity,in terms of optical density,can reach to 9.4×10^(-6).
