Effect of the Downwash Flow Field of a Single-Rotor Uav on Droplet Velocity in Sugarcane Plant Protection

Zhang, Ping; Zhang, Wei; Sun, Haitian; Fu, Haiba; Liu, Jiansheng

doi:10.1590/1809-4430-eng.agric.v41n2p235-244/2021

Cited by 5 publications

(1 citation statement)

References 15 publications

(13 reference statements)

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“…Although lower rotations produce larger droplets and, consequently, less coverage. This treatment shows that the higher height leads to a greater range of spray and, thus, more drops to cover the target due to the downwash effect (ZHANG et al, 2021). Xue et al (2014) evidenced similar result in their study.…”

Section: Resultssupporting

confidence: 60%

Spraying quality using unmanned aerial vehicle in citrus

Nascimento

Vitória

2022

Reveng

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This study aimed to evaluate the effect of the operating flight height of an unmanned aerial vehicle with different spray tip rotations on the parameters of droplet coverage, density and volumetric median diameter of the sprayed droplets, in acid lime culture ´Tahiti’. The experiment was performed in randomized blocks design, with repetition within the block, in a factorial system (3x2), with four repetitions. Three planting lines were selected for each treatment. The two outer lines were used as borders and the central one for evaluation. In each treatment, one plant was selected from the planting line and four water-sensitive papers were fixed in the middle third of the outermost portion of the canopy.A solution containing water and a drift reducing adjuvant was prepared to analyze the quality of the spray. A significant difference was found for the variables of spray tip rotation and flight height with no interaction between them. This result indicates that these variables act independently on the volumetric median diameter values. Furthermore, the spray heights of 3.0 m and 4.0 m have a notable effect on the amount of deposition. However, their influence on droplet size is negligible.

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Section: Resultssupporting

confidence: 60%

Spraying quality using unmanned aerial vehicle in citrus

Nascimento

Vitória

2022

Reveng

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Challenges and opportunities of unmanned aerial vehicles as a new tool for crop pest control

Hewitt

Chen

et al. 2023

Pest Management Science

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The application of pesticides is not simply delivering chemicals to the target area. It also involves considering the negative aspects and developing strategies to deal with them during the application process, to ensure the maximization of pesticides use efficiency and the maintenance of the ecosystem. Unmanned aerial vehicle (UAV) sprayers demonstrate unique advantages compared to traditional ground sprayers, particularly in terms of maneuverability and labor intensity reduction, showed great potential for chemical application in pest control. It is undeniable that there exist challenges in the practice of UAV spraying, such as higher potential risks of pesticide drift or pathogen transmission, uncertainty canopy deposition for different crops, and unexpected leaf breakage induced by downwash flow. Maximizing the utilization of downwash flow while avoiding lateral air movement outside the intended target crop area is a major issue for chemical application with UAV sprayers, particularly in light of the increasingly apparent consensus on the need for enhanced environmental protection during the chemical application process. It must be considered that the operation strategy in different scenarios and for different crop targets is not the same, unique requirements should be given on nozzle atomization, flight parameters, adjuvants and aircraft types in specific working situation. In future, the implementation of spray drift prediction, technical procedures development, and other solutions aimed at reducing pesticide drift and improving deposition quality, is expected to to promote the adoption of UAV sprayers by more farmers.This article is protected by copyright. All rights reserved.

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