Study On Flight Control Parameters And Efficiency For Rice Pest Control By TH80-1 Plant Protection UAV

With the development of modern agricultural technology, the process of agricultural production, from plowing, soil preparation, transplanting to harvesting are mechanized. Therefore, a labor saving and high efficient technology of pesticide usage has become the inevitable requirement for agricultural production. The Plant Protection UAV is a new spraying method in our country in recent years. This study is based on flight control parameters and pesticide formulations for rice pest control by TH80-1, and the results are as follows:Firstly, with droplet test car and test system, primary studies were made on TH80-1 Plant Protection UAV. This study aims to find relationship between droplet diameter and width of flight in different flight control parameters. If the flight condition is as below, flight speed:3-4m/s; flight height:1-2m from canopy; flow rate:0.45-0.6L/acre at the spray motor voltage of 9.6V; width of flight:5m at the early period of rice growth and 4m at tillering and heading stage; wind speed:lower than 5m/s, then droplet deposition of rice leaves can meet the requirement of control, droplet diameter will reach 88.60um, which is better than electric sprayer under the same condition.From the droplet distribution point of view, the flight speed of 3m/s, flight altitude 1.5m, motor voltage at 9.6V, wind speed under 5m/s is the best flight control.Secondly, in this paper, we screened pesticide formulations, made evaluations on droplet diameters, uniformity and stability of pesticide liquid, and fully simulated the real spraying environment to select and construct pharmaceutical formulations system of UAV. In the choice of pesticide formulations, we find that EC, SL and SC are suitable for aerial control. While solid preparations, like WP, WDG, are not suitable, but they can be used if they are mixed as stable solution system. In terms of pesticide auxiliaries, they can help land droplets and reduce droplet diameters, thereby to facilitate the distribution of pesticide liquid. From analysis, we find that both A and B have a strong effect on spray performance. But B has a strong odor of acetic acid, which is bad for plane controller. In terms of sedimentation agent, when wind speed is at 2.1m/s and 3.8m/s, sedimentation agent D or F can increase distribution of the droplets and the distribution is within effective range; but when wind speed is at 6.4m/s, although the sedimentation agent can increase distribution of the droplets, the quantity is outside of effective range of 20/cm~2.Thirdly, this paper is studied on effects and applications of TH80-1 UAV. Two spraying methods were used to check the effect of pesticides. The results show that under the same pesticide formulations, during the late period of tillering,3,7,14 days after TH80-1 UAV spraying, the effect of treatment of Planthopper are as high as 70.83%, 81.23% and 91.04%, of Medinalis is as 66.76%,69.32% and 87.33%.7,14 days after spraying, the effect of treatment of Rhizoctonia is 76.62% and 91.22%. The control effect is remarkably better than traditional sprayer. After five times of pesticides spraying, the control effect of Planthopper, Borer, Medinalis, Rhizoctonia is 91.18%,88.63%,93.4% and 80.80%, while for traditional sprayer, it is 89.20%,87.33%,93.05% and 80.43% accordingly, increased by 0.98%,1.3%,1.3% and 0.98%.TH80-1 is a kind of stable and reliable plant protection UAV with independent intellectual property rights. Under the condition of the best flight control parameters and the pesticide formulations, Comparation with traditional sprayer, the plant protection UAV with low altitude and volume spraying technology was more labor, time and water saving. And the control effect is remarkable and those are both superior to the efficacy of spraying with traditional sprayer.