Assessment of spray deposition, drift and mass balance from unmanned aerial vehicle sprayer using an artificial vineyard

Wang, Changling; Herbst, Andreas; Zeng, Aijun; Wongsuk, Supakorn; Baiyu, Qiao; Qi, Peng; Bonds, Jane; Overbeck, Verena; Yi, Yang; Gao, Wanlin; He, Xiongkui

doi:10.1016/j.scitotenv.2021.146181

Cited by 58 publications

(52 citation statements)

References 16 publications

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“…There has been increasing interest from researchers in UAV spraying operations in orchards and vineyards since 2016. Most studies have focused on the effects of application parameters (flight height and velocity), tree shape, UAV type, nozzle, adjuvant on the spray deposition distribution in the canopy of fruit trees or grapes, ground loss and drift, [10][11][12][13][14] as well as on the comparisons between UAV sprayer and ground applicator. [15][16][17] From 2016 to 2018, we performed a series of spray performance tests in pear orchards using an unmanned octocopter sprayer with 10-L payload (maximum take-off weight 24.8 kg) under the support of China Agriculture Research System -28.…”

Section: Introductionmentioning

confidence: 99%

Spray performance evaluation of a six‐rotor unmanned aerial vehicle sprayer for pesticide application using an orchard operation mode in apple orchards

Wang

Liu

Zhang

et al. 2022

Pest Management Science

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BACKGROUND: In the last decade, unmanned aerial vehicle (UAV) sprayers have been growing rapidly worldwide as a new method for pesticide application, especially in Asian countries. More and more manufacturers and service providers are currently aiming at UAV spraying operation for fruit trees with higher economic value. We evaluated the spray performance of an electric six-rotor UAV sprayer using an orchard operation mode (different application volumes and flight patterns) in a hilly apple orchard with small and sparse trees (SS) and a plain orchard with tall-spindle trees (TS).RESULTS: Application volume (APV) had a significant influence on the spray coverage parameters in both orchards, while flight pattern, intra-row, inter-row and verti-row, had a relatively limited influence at 60 0 and 85 7 L/ha. The UAV's downwash airflow produced a good spray penetration in the isolated SS trees, but not for the conjoined TS trees. It is better to fly along and above rows at 63.5 L/ha or higher for SS trees. The excessively low underside coverage is the main drawback of UAV orchard pesticide application and the underside droplet size was generally less than 200 ∼m.CONCLUSION: Spray performance is closely related to tree shape, planting pattern, UAV payload, application volume, spray droplet size and downwash airflow field. The results provide data support for the best operational practice development and the decision model for the application volume of UAV sprayer orchard operations. The underside spray performance requires further improvement by several effective measures.

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Section: Introductionmentioning

confidence: 99%

Spray performance evaluation of a six‐rotor unmanned aerial vehicle sprayer for pesticide application using an orchard operation mode in apple orchards

Wang

Liu

Zhang

et al. 2022

Pest Management Science

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“…experimented in citrus trees and found that when the operation height was 1.2 m and the flight speed was 3.5 m s −1 , UAVs gave higher droplet densities and droplet coverage rates. Wang et al 23 . tested the performance of two UAV nozzles types and reported that the application of an air‐injector flat fan nozzle promoted droplet deposition and uniformity and reduced the drift.…”

Section: Introductionmentioning

confidence: 99%

“…Tang et al 22 experimented in citrus trees and found that when the operation height was 1.2 m and the flight speed was 3.5 m s −1 , UAVs gave higher droplet densities and droplet coverage rates. Wang et al 23 tested the performance of two UAV nozzles types and reported that the application of an airinjector flat fan nozzle promoted droplet deposition and uniformity and reduced the drift. Under comprehensive consideration of the density, uniformity and penetration of droplet deposition, Zhang et al 24 concluded that the optimal spraying parameters of UAVs for sugarcane were 15 L ha −1 spray volume, 3 m flight height and 4 m s −1 flight velocity.…”

Section: Introductionmentioning

confidence: 99%

Assessing the application of spot spray in Nanguo pear orchards: Effect of nozzle type, spray volume rate and adjuvant

Guo

Yao

et al. 2022

Pest Management Science

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BACKGROUND Aerial spray is one of the most important applications of unmanned aerial vehicles (UAVs) in agriculture. This work aimed to promote the use of UAVs as an alternative to knapsack electric sprayers in pesticide application in Nanguo pear orchards planted in mountain terraced orchard scenarios. The spray deposition of four types of nozzles (SX110015, XR80015, IDK90015 and TR80015), two spray volume rates (45 and 90 L ha−1) and with or without a commercial surfactant adjuvant were evaluated based on the spot spray mode. RESULTS The air‐ assisted IDK90015 nozzle showed significantly higher deposition and penetration, and its large droplet size also reduced the risk of drift. Increasing the spray volume rate can increase the amount of droplets deposition. The adjuvant showed excellent potential to improve spray technology in Nanguo pear trees, with a mean deposition of 0.175–0.574 μL cm−2 and penetration of 3.09–66.73%. The droplet size also increased significantly, with volume median diameter (DV0.5) of 469 μm. CONCLUSION The nozzle type, spray volume rate and adjuvant should be well considered when using the spot spray in orchard. Compared with increasing spray volume rate, the use of air‐induction nozzles and surfactant‐based adjuvants can improve the spray deposition better. © 2022 Society of Chemical Industry.

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“…Hydraulic nozzles have a long history and a wide range of types. Wang C. et al (2021) tested the performance of an IDK120–015 air-injector nozzle and a TR 80–0067 hollow cone nozzle. At a speed of 3.11–3.79 m/s in a crosswind, compared with the traditional HCN nozzles of UAV sprayers, the application of AIN promotes spray deposition and uniformity and significantly reduces deposition and air drift.…”

Section: Techniques For Improving the Deposition Effectmentioning

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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Assessment of spray deposition, drift and mass balance from unmanned aerial vehicle sprayer using an artificial vineyard

Cited by 58 publications

References 16 publications

Spray performance evaluation of a six‐rotor unmanned aerial vehicle sprayer for pesticide application using an orchard operation mode in apple orchards

Spray performance evaluation of a six‐rotor unmanned aerial vehicle sprayer for pesticide application using an orchard operation mode in apple orchards

Assessing the application of spot spray in Nanguo pear orchards: Effect of nozzle type, spray volume rate and adjuvant

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

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