What kind of plant protection drone has good operational effects? This article tells you how to choose a drone

The effectiveness of plant protection drone operations can generally be determined within a few days after administering medication. For example, herbicides and other chemical control drugs, if they are ineffective, you will see green and yellow patches in the fields, which can be easily understood at a glance. Therefore, whether the effect is good or not is up to the farmers the final say.1. pngBut if you don’t want to wait until the homework is finished to judge the effectiveness, but rather judge the reliability of the plant protection drone from a test flight experiment, or even from the product information itself, then please continue reading.Generally speaking, we can evaluate the operational effectiveness of a plant protection drone from several aspects, such as whether it can spray accurately, evenly, without repeated or missed spraying, whether it can work at night, and adapt to various terrains.Can we spray pesticides accurately and ensure they are in place?What is getting pesticides in place? In the process of plant protection, pesticides need to be sprayed on both sides of crop leaves and allowed to adhere to the leaves in order to effectively kill pests.Can the plant protection drone deliver pesticides properly? First, check the compressed air field, and second, check the atomization effect.It is often impossible to hit the back of crop leaves with traditional spray. When the drone flies over, it brings a strong downforce wind field, which can blow the blades over, allowing drugs to attach to the back of the blades.But sometimes when the wind field is too large, it can cause drug waste and crop damage. For example, in the single rotor plant protection aircraft shown in the picture, its nozzle is connected in series with a crossbar below the drone. During flight, turbulence occurs, and the airflow generated by the propeller rolls up the medicine, causing the medicine to drift and possibly attach to the aircraft body.And installing the nozzle directly below the propeller motor ensures stable wind field, no turbulence, medication does not contaminate the aircraft itself, and it is not easy to harm crops.2. PNG▲ Adhesion effect diagram of pesticide solution sprayed on the surface of crop leavesThe amount of water added from left to right is increasing, and the atomized particles are getting larger and larger. It can be seen that the smaller the atomized particles, the more uniform their attachment is, and they are less likely to converge into water droplets and then drip and waste.3. pngSchematic diagram of atomized particles hitting the surface of pestsLarge particle liquids are prone to aggregation and loss, while small atomized particles are necessary to uniformly adhere to the surface of insects, achieving contact killing and prevention effects.Generally speaking, in order to ensure a better spraying effect, the atomization particles used in plant protection drone operations must be below 250 microns.Can we spray evenly to evenly distribute the medicine in the target area?At present, there are two main spraying technologies for plant protection drones on the market: constant spraying technology and variable spraying technology.A plant protection drone needs to turn when flying in a plot of land. When turning, it usually slows down. If it uses constant spraying technology, the flow rate will not automatically adjust as the flight speed slows down, which may cause excessive crop spraying at the turning point on the ground, resulting in pesticide damage and waste.The drone using variable spraying technology can reduce the flow rate as the flight speed slows down, ensuring equal pesticide application per inch of farmland and achieving good spraying results.Can we avoid re spraying or missed spraying?Heavy spraying and missed spraying can cause significant damage to crops, especially chemical control agents such as herbicides. Spraying too much can cause damage, while spraying too little has no effect.4. pngThe drone sprayed heavily and missed spraying, turning the chili fields into a green and yellow “football field”To avoid repeated or missed spraying, it is necessary for plant protection drones to achieve high-precision flight. A purely manually operated plant protection machine, the pilot relies on visual observation to determine the route, and the human influence factor is too large, making it difficult to fly accurately.According to positioning technology, there are currently GPS navigation and RTK navigation plant protection drones on the market.5. pngComparison of RTK and GPS positioning technologies (white boxes represent land parcels, green lines represent the actual flight path of drones)Unmanned aerial vehicles using GPS navigation may experience positioning errors due to difficulty in avoiding environmental interference, resulting in significant flight path deviation (as shown on the right), leading to issues such as re spraying and missed spraying.By using RTK carrier phase difference technology, the positioning error can be controlled within 10 centimeters, allowing plant protection drones to fly and spray more accurately.Can it adapt to different homework hours and various terrains?Many pests lie dormant during the day and emerge at night, and the effectiveness of pesticide spraying during the day is poor; Especially in summer, when the temperature is high at noon, spraying pesticides can easily evaporate and affect their efficacy, which requires plant protection drones to be able to work at night. Nighttime operations require high requirements for route planning and obstacle avoidance systems, which can only be achieved by unmanned aerial vehicles capable of fully autonomous flight and operation.6. png▲ Long term exposure shooting of P20 drone night operation imagesThe surface of some farmland is uneven, or the height of some crop canopies varies. To ensure the spraying effect, plant protection drones need to be able to adapt to various terrains and maintain a relatively constant distance from the crop canopy. At present, drones can achieve this through ground simulation flight technology.Unmanned aerial vehicles that cannot simulate ground flight may have poor pesticide application effects on low crown crops when operating on uneven crop canopies due to their distance from the drone. In addition, changes in terrain, especially sudden increases in terrain, may lead to drone collisions and damage.Of course, the effectiveness of drone plant protection depends not only on the medication itself, but also on the choice of medication. Whether the pesticide itself is of high quality and whether suitable flight control agents are used can directly affect the effectiveness of the operation.