Meteorological and flight altitude effects on deposition, penetration, and drift in pineapple aerial spraying

Wang, Juan; Lan, Yubin; Wen, Sheng; Hewitt, Andrew; Yao, Weixiang; Chen, Pengchao

doi:10.1002/apj.2382

Cited by 20 publications

(14 citation statements)

References 20 publications

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“…When the height is lower than 2 m, the strong downward airflow makes the droplet deposition on different cotton canopies decrease significantly ( Lou et al, 2018 ). The flying altitude of the UAV should be less than 2.5 m ( Wang J. et al, 2020 ) when it is spraying pineapples. When the flight altitude was higher than 2.5 m, the droplet deposition decreased suddenly.…”

Section: Unmanned Aerial Vehicle Operation Parameters Affecting the D...mentioning

confidence: 99%

Research on Methods Decreasing Pesticide Waste Based on Plant Protection Unmanned Aerial Vehicles: A Review

Kaizu

Huang

et al. 2022

Front. Plant Sci.

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In plant protection, the increasing maturity of unmanned aerial vehicle (UAV) technology has greatly increased efficiency. UAVs can adapt to multiple terrains and do not require specific take-off platforms. They do well, especially in farmland areas with rugged terrain. However, due to the complex flow field at the bottom of a UAV, some of the droplets will not reach the surface of a plant, which causes pesticide waste and environmental pollution. Droplet deposition is a good indicator of the utilization rate of pesticides; therefore, this review describes recent studies on droplet deposition for further method improvement. First, this review introduces the flight altitude, speed, and environmental factors that affect pesticide utilization efficiency and then summarizes methods to improve pesticide utilization efficiency from three aspects: nozzles, electrostatic sprays, and variable spray systems. We also point out the possible direction of algorithm development for a UAV’s precision spray.

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Section: Unmanned Aerial Vehicle Operation Parameters Affecting the D...mentioning

confidence: 99%

Research on Methods Decreasing Pesticide Waste Based on Plant Protection Unmanned Aerial Vehicles: A Review

Kaizu

Huang

et al. 2022

Front. Plant Sci.

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“…Large drops generate low surface coverage and drainage; on the other hand, they are less prone to wind displacement. Small droplets, although they enable optimal target coverage, may undergo problems such as drift and evaporation, with consequent risks regarding environmental contamination (Wang et al, 2020;Carvalho et al, 2017;Huang et al, 2011). Hollow cone spray nozzles, which are similar to rotating atomizers used in agricultural aircrafts and sprinklers, are traditionally employed in the application of fungicides and insecticides, and have as a common characteristic the production, in general, of fine droplets.…”

Section: Introductionmentioning

confidence: 99%

Spray Deposition on Watermelon Crop in Aerial and Ground Application

Vitória¹,

Alves²,

Rossi³

et al. 2022

JAS

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The quality and quantity production of watermelon requires the effective control of pests, diseases, and weeds, which is directly related to spraying techniques. The method of application of phytosanitary products is essential, but, most of the time, emphasis is given mainly to the applied product and little attention to the application technique. The objective of the present study was to characterize the ejected spray in the aerial and terrestrial spraying of watermelon crops, with the use of adjuvants in a liquid solution. The experiment was carried out in two commercial plantations, in an entirely randomized design, employing a 6 × 2 factorial scheme, with six forms of application and two liquid compositions. The droplet spectrum was assessed employing water-sensitive card imaging. Smaller drop sizes and relative amplitudes were produced by aerial applications. In turn, the largest droplet diameters and the lowest percentage of drops smaller than 100 μm were obtained when using air induction flat double-jet nozzles. The adjuvant did not interfere in the numerical and volumetric median diameters, the relative amplitude, or the volume rate of droplets smaller than 100 μm.

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“…The wind speed and wind direction in meteorological conditions have greater influences on the deposition and drift of the pesticide droplets, in comparison to the flying height of the UAV and the droplet size, etc. In particular, the crosswind-induced pesticide drift, which can be defined as the process whereby the pesticide droplet disappears or re-settles after being carried out of the target area by the airflow perpendicular to its motion, is a principal factor affecting aerial spraying [ 1 ]. Since the pesticide droplet drifting outside of the target area could lead to the ineffective spraying dosage of pesticides, it not only affects the control efficiency and reduces the utilization of pesticides, but also seriously impacts the growth of sensitive crops in non-target areas and pollutes the ecological environment [ 2 ].…”

Section: Introductionmentioning

confidence: 99%

WSN-Assisted UAV Trajectory Adjustment for Pesticide Drift Control

Tuan

Yang

et al. 2020

Sensors

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Unmanned Aerial Vehicles (UAVs) have been widely applied for pesticide spraying as they have high efficiency and operational flexibility. However, the pesticide droplet drift caused by wind may decrease the pesticide spraying efficiency and pollute the environment. A precision spraying system based on an airborne meteorological monitoring platform on manned agricultural aircrafts is not adaptable for. So far, there is no better solution for controlling droplet drift outside the target area caused by wind, especially by wind gusts. In this regard, a UAV trajectory adjustment system based on Wireless Sensor Network (WSN) for pesticide drift control was proposed in this research. By collecting data from ground WSN, the UAV utilizes the wind speed and wind direction as inputs to autonomously adjust its trajectory for keeping droplet deposition in the target spraying area. Two optimized algorithms, namely deep reinforcement learning and particle swarm optimization, were applied to generate the newly modified flight route. At the same time, a simplified pesticide droplet drift model that includes wind speed and wind direction as parameters was developed and adopted to simulate and compute the drift distance of pesticide droplets. Moreover, an LSTM-based wind speed prediction model and a RNN-based wind direction prediction model were established, so as to address the problem of missing the latest wind data caused by communication latency or a lack of connection with the ground nodes. Finally, experiments were carried out to test the communication latency between UAV and ground WSN, and to evaluate the proposed scheme with embedded Raspberry Pi boards in UAV for feasibility verification. Results show that the WSN-assisted UAV trajectory adjustment system is capable of providing a better performance of on-target droplet deposition for real time pesticide spraying with UAV.

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Meteorological and flight altitude effects on deposition, penetration, and drift in pineapple aerial spraying

Cited by 20 publications

References 20 publications

Research on Methods Decreasing Pesticide Waste Based on Plant Protection Unmanned Aerial Vehicles: A Review

Research on Methods Decreasing Pesticide Waste Based on Plant Protection Unmanned Aerial Vehicles: A Review

Spray Deposition on Watermelon Crop in Aerial and Ground Application

WSN-Assisted UAV Trajectory Adjustment for Pesticide Drift Control

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