&amp;lt;i&amp;gt;Research of Comparative Experiment on Aerial Spray and Air-assisted Spray in Closed Type of Orchard&amp;lt;/i&amp;gt;

Chen, Bingtai; Zheng, Yongjun; Yang, Shaoqiong; Ma, Hengtao; Jiang, Simin

doi:10.13031/aim.202000484

Cited by 2 publications

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“…14,24 The WSPs are attached to the leaf by clips or curved pins according to the leaf length. 21,[29][30][31] The fruit trees have an approximate height of 3-4 m, with the upper sampling positions being around 2.5-3.5 m high. The sampling positions at the middle and lower levels can be easily arranged by the operators.…”

Section: Introductionmentioning

confidence: 99%

“…In most of the existing trials conducted in orchards, the fruit trees are typically divided into three canopy levels from top to bottom, and samplers are placed at these three heights 14,24 . The WSPs are attached to the leaf by clips or curved pins according to the leaf length 21,29–31 . The fruit trees have an approximate height of 3–4 m, with the upper sampling positions being around 2.5–3.5 m high.…”

Section: Introductionmentioning

confidence: 99%

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Evaluating the use of unmanned aerial vehicles for spray applications in mountain Nanguo pear orchards

Guo,

Chen,

et al. 2024

Pest Management Science

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BACKGROUNDNanguo pear is a distinctive pear variety in northeast China, grown mainly in mountainous areas. Due to terrain limitations, ground‐based pesticide application equipment is difficult to use. This limitations could be overcome by using unmanned aerial vehicles (UAV) for pesticide application in Nanguo pear orchards. This study evaluated the spraying performance of two UAVs in the Nanguo pear orchards and compared them with a manually used backpack electric sprayer (BES). The study also analysed the effect of canopy size on droplet deposition and ground loss and evaluated two sampling methods, leaf sampling and telescopic rod sampling.RESULTSCompared to BES, droplet deposition is lower for UAVs, but the actual pesticide active ingredient deposition is not necessarily lower given the solution concentration. The droplet deposition varies among different UAVs due to structural differences. Under the same UAV operating parameters, droplet deposition on trees with smaller canopy sizes is typically greater than that on trees with larger canopy sizes, and the ground loss was also more severe. Although telescopic rod sampling is a quick and convenient method, it can only reflect the trend of droplet deposition, and the data error is greater compared with leaf sampling.CONCLUSIONUAVs can achieve better droplet deposition in mountainous Nanguo pear orchards and almost has no harm to the operators compared with the BES. However, canopy size needs to be considered to adjust the application volume rate. Telescopic rods can be used for qualitative analyses only, but are not recommended for quantitative analyses.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Evaluating the use of unmanned aerial vehicles for spray applications in mountain Nanguo pear orchards

Guo,

Chen,

et al. 2024

Pest Management Science

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Effect of Operational Parameters of Unmanned Aerial Vehicle (UAV) on Droplet Deposition in Trellised Pear Orchard

Zhang

Wang

et al. 2023

Drones

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Background: Unmanned Aerial Vehicles (UAVs) are increasingly being used commercially for crop protection in East Asia as a new type of equipment for pesticide applications, which is receiving more and more attention worldwide. A new model of pear cultivation called the ‘Double Primary Branches Along the Row Flat Type’ standard trellised pear orchards (FT orchard) is widely used in China, Japan, Korea, and other Asian countries because it saves manpower and is suitable for mechanization compared to traditional spindle and open-center cultivation. The disease and pest efficacy of the flat-type trellised canopy structure of this cultivation is a great challenge. Therefore, a UAV spraying trial was conducted in an FT orchard, and a four-factor (SV: Spray application volume rate, FS: Flight speed, FH: Flight height, FD: Flight direction) and 3-level orthogonal test were designed. Results: These data were used to analyze the effect, including spray coverage, deposit density, coefficient of variation, and penetration coefficient on the canopy, to determine the optimal operating parameters of the UAV for pest efficacy in FT orchards. The analysis of extremes of variance showed that factor FD had a significant effect on both spray coverage and deposition density. Followed by factor FS, which had a greater effect on spray coverage (p < 0.05), and factor SV, FH, which had a greater effect on deposition density (p < 0.05). The effects of different factors on spray coverage and deposit density were FD > FS > FH > SV, FD > FH > SV > FS, in that order. The SV3-FS1-FH1-FD3, which flight along the row with an application rate of 90 L/ha, a flight speed of 1.5 m/s, and a flight height of 4.5 m, was the optimal combination, which produced the highest deposit density and spray coverage. It was determined through univariate analysis of all experimental groups, using droplet density of 25/cm2 and spray coverage of 1%, and uniformity of 40% as the measurement index, that T4 and T8 performed the best and could meet the control requirements in different horizontal and vertical directions of the pear canopy. The parameters were as follows: flight along the tree rows, application rate not less than 75 L/ha, flight speed no more than 2 m/s, and flight height not higher than 5 m. Conclusion: This article provides ample data to promote innovation in the use of UAVs for crop protection programs in pergola/vertical trellis system orchards such as FT orchards. At the same time, this project provided a comprehensive analysis of canopy deposition methods and associated recommendations for UAV development and applications.

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<i>Research of Comparative Experiment on Aerial Spray and Air-assisted Spray in Closed Type of Orchard</i>

Cited by 2 publications

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Evaluating the use of unmanned aerial vehicles for spray applications in mountain Nanguo pear orchards

Evaluating the use of unmanned aerial vehicles for spray applications in mountain Nanguo pear orchards

Effect of Operational Parameters of Unmanned Aerial Vehicle (UAV) on Droplet Deposition in Trellised Pear Orchard

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