飞防助剂对植保无人飞机喷施除草剂雾滴分布的影响

Effects of adjuvants on spray droplet distribution of herbicides sprayed by plant protection UAV

通过仪器分析结合田间试验方法,研究了不同飞防助剂对3种剂型除草剂沉积率、雾滴粒径、物理指标及田间药效,系统地分析飞防助剂对植保无人飞机喷施除草剂的增效作用及增效机理。结果表明,4种飞防助剂均有显著的增效作用。其中迪翔对3种除草剂的作用效果最为显著,可降低雾滴谱相对宽度至0.62,使雾滴均匀分布;增加沉积率,可最多增加32.2百分点;同时可显著降低3种除草剂的药液表面张力,增加药液黏度及扩展直径,延长其干燥时间。迈飞对乳油作用效果较好,在增加药液扩展直径方面优于其他3种飞防助剂。总体比较4种飞防助剂对除草剂的增效作用,大小依次为迪翔>迈飞>烈鹰>Greenwet 3710;3种剂型除草剂中,飞防助剂对乳油增效作用最显著,增效可达23百分点。

The instrumental analysis combined with the field test were performed to investigate the deposition coverage,droplet size,physical index and field efficacy of different adjuvants of three dosages of herbicides,and systematically analyze the synergistic effect and synergistic mechanism of adjuvants of herbicides sprayed by plant protection drone.The results showed that all the four adjuvants had significant synergistic effects.Among them,Dixiang had the most significant effect on the three herbicides,and reduced the relative width of the mist droplet spectrum to 0.62,making droplets evenly distributed,increasing the deposition rate by 32.2 percentage points;at the same time,it significantly reduced the surface tension,increased the viscosity of the liquid and expanded the diameter,and prolong the drying time of herbicides.Maifei had a better effect on the emulsifiable concentrate and was superior to the other three kinds of adjuvants in increasing the diameter of the liquid expansion.By comparing the synergistic effects of four adjuvants of herbicides,their synergistic effects were as followed:Dixiang>Maifei>Lieying>Greenwet 3710.The adjuvants had the most significant synergistic effect on the emulsifiable concentrates,with a synergism up to 23 percentage points.