In order to introduce better anti - synergistic additives, Qingyu has made an in-depth study on the relationship between the quality and efficacy of the spray, and has been screened and verified through indoor and field flight tests.

　　The comparison between artificial spray and UAV flight prevention is that the left side is artificial spray, and the right side is the UAV operation. 16 farmers and 1 UAVs compete for efficiency, and the fog data are collected simultaneously for analysis. The traditional artificial spraying method and professional flight prevention service organization PK redefine the way of future agriculture, which is also the intersection of history and modern agriculture.

　　By comparing the Yellow droplet collection card on the left side, the density of the droplets on the last UAV is relatively sparse. The density of the next collection of artificial spray cards is very high, but we should know that after all, the amount of water used for manual spraying is 30 times that of UAVs, and that of artificial liters is 30 liters and that of UAVs is 1 litres.

　　Secondly, we will find that there is a problem with artificial spray. A group of water sensitive paper can see that there is a clear leakage phenomenon, and the relative influence of UAV is relatively small. The only factor is the instantaneous wind during spraying. Therefore, intuitively, the overall coverage of UAV is lower than that of artificial spray, but the uniformity of droplets is much better than that of artificial spray. When it comes to manual sprayers, the teacher's courseware is quoted here. He used a very clever experiment to do the data. He directly painted blue dye on the snow, and the blue picture on the right. It clearly showed us the "Z" type trajectory formed by artificial spray, and the phenomenon of missing spray was very obvious.

　　The above figure is a summary of the "one spray, three control" bioassay test of wheat in the flowering period this year. The red is artificial spray, and the light blue treatment is a group of adding antiaircraft auxiliaries. The density of the anti fog droplets is much better than that of the other groups.

　　We also participated in a number of experiments conducted by the Ministry of agriculture's "fertilizer double reduction" project, including the difference between droplet deposition data and control efficiency of different types of aircraft. According to the statistics of the control efficiency of wheat scab, the overall control effect is very good, and a lot of UAV races. Data show that different types of UAV in flight parameters and spray quality side There are objective differences in all aspects, which have a certain impact on the efficacy, but on the whole, the differences are not significant, all within a reasonable range.

　　In order to study the pharmacy and preparation science in the flight control application scenario, the A6 + alliance, initiated by Qingyu and jointly established by six domestic institutes, enterprises and scientific research institutions, is a professional technical alliance with the main research content of pesticide dispersion and transmission and the main topic of application technology promotion.

　　At present, the alliance has established two key laboratories and several research centers. The first is the "Evaluation Laboratory of droplet spatial transfer", which is a large laboratory with wind tunnel system as the core detection device. It can simulate the scene of UAV flight control, control the wind speed and the temperature and humidity in the spray bin, and select the conditions of spray, such as sprinkler type, spray pressure and so on. It can simulate the spray heads of different mechanical applicators from the height of crop canopy, from 30cm's artificial spray to 50cm's mechanical spray machine, and to 1.5m's UAV spray can be simulated.

　　The other is to characterize the constant temperature liquid interface. In this laboratory, we used dynamic surface tension instrument to simulate the change of dynamic surface tension of the liquid medicine at the moment of contact with the leaf, which can accurately characterize whether the liquid medicine can effectively stay on the blade. We also use high-speed camera and other equipment to observe the viscoelastic phenomenon of the liquid medicine when it hits the leaf surface, including viscoelastic detector, dryness tester and surface tension Force instrument, dynamic contact angle tester, etc. We are now equipped with these instruments to establish this research and development platform, which is also open to pesticide enterprises. Welcome to exchange or test samples.

　　At the same time, it also includes a flight defense intelligent equipment research laboratory, which is mainly for UAV related application research, including UAV use training, etc. under the promotion of A6 + alliance, we have organized and participated in a number of flight prevention experiments for a variety of crops.

　　As you can see from these four pictures, we have done a lot of flight control tests, including different crops, different additives, different aircraft types, etc., and we have basically established some basic application databases.

　　In the application of plant protection and flight prevention, we deeply feel that the flight prevention industry is an epitome of agricultural modernization, and its future development is unlimited. The intellectualization and mechanization of agriculture in the future is the only way for the development of agricultural modernization.

　　In recent years, Qingyu has held many academic seminars on "reducing application and increasing efficiency" and Research on droplet transfer. In 2017, we successfully held the seminar on "droplet transfer interface behavior characterization" in Nantong. In October 2018, we held the seminar on "spray technology indoor simulation system". In June 2019, we held the training course on the theme of "reducing pesticide efficiency and increasing efficiency". At the same time, we are also a member of the National Aviation Technology Innovation Alliance.

　　Through these two years of work accumulation, we sincerely hope to do a good job in the brilliant cause of plant protection and flight prevention together with all colleagues of pesticide enterprises.