Deposition and biological efficacy of UAV-based low-volume application in rice fields

Wang, Guobin; Li, Xuan; Andaloro, J. T.; Chen, Pengchao; Song, Chunqiao; Shan, Changfeng; Chen, Shengde; Lan, Yubin

doi:10.33440/j.ijpaa.20200302.86

Cited by 11 publications

(13 citation statements)

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“…Wang [24] et al found that increasing the rate of application using a quadcopter UAV increased droplet density and coverage, and concluded that this is a beneficial strategy when the aim is to increase the spray coverage of the target area. The authors also observed that adding an adjuvant had a positive effect.…”

Section: Effects On Droplet Coverage and Densitymentioning

confidence: 99%

“…Furthermore, in the ground application the highest rate could result in spray loss to the soil, because part of the droplets may have run off into the soil from the leaves. Wang [24] et al reported that spray deposition and efficacy of control of Pyricularia oryzae and Cnaphalocrocis medinalis on rice were similar whether spraying with a UAV or a backpack electric sprayer. However, in pepper (Capsicum annuum) fields, Xiao [28] et al found slightly lower efficacy of control of Phytophthora capsici and aphids with a UAV than with a backpack electric sprayer.…”

Section: Effects On Tracer Depositionmentioning

confidence: 99%

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Deposition of spray applied to a soybean crop using an unmanned aerial vehicle

Cunha

Silva²

2018

International Journal of Precision Agricultural Aviation

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The use of unmanned aerial vehicles (UAVs), or drones, to apply crop protection products has been increasing; however, because this is a recently developed technology, data about its efficacy in many crops are still scarce. The objective of this study was to evaluate the deposition of a spray applied to a soybean crop with a UAV at two flight speeds and compare it to that of spray applied with a ground-based sprayer. The experiment used a DJI AGRAS MG-1 UAV to spray a soybean crop at the R3 growth stage. The experiment consisted of three treatments with eight replicates for each; the spray was applied using the UAV flying at 15.4 km/h or 21.8 km/h or a CO 2 -pressurized backpack sprayer. The application rate was 10 L/hm 2 with the UAV and 115 L/hm 2 with the ground-based sprayer. The following parameters were evaluated: deposition of a tracer added to the spray solution (500 g/hm 2 in all treatments) in the upper and middle parts of the soybean plants using spectrophotometry and droplet coverage, density, and size spectrum using water-sensitive paper cards. Flight speed did not alter droplet coverage, density, or spectrum. The coverage in the middle layer of the soybean canopy was low whether application was by the ground-based application (1.2%) or by the UAV (0.2%), which demonstrated the difficulty of reaching that part of the plants. Tracer deposition in the upper and middle parts of the soybean plants from the UAV was similar to that obtained with the ground-based application.

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Section: Effects On Droplet Coverage and Densitymentioning

confidence: 99%

Section: Effects On Tracer Depositionmentioning

confidence: 99%

Deposition of spray applied to a soybean crop using an unmanned aerial vehicle

Cunha

Silva²

2018

International Journal of Precision Agricultural Aviation

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“…The optimized flight height, flight speed, and spray swath were selected [23,24] , which improved the pesticide application quality. In terms of field efficacy evaluation, the effect of spray volume and droplet size on different crop diseases and pest control were tested and the results proved the feasibility of UAV spraying [25,26] . Droplets drift is the most challenging and complex issue that caused extensive concern associated with the application technology of UAVs.…”

Section: Introduction mentioning

confidence: 98%

Droplets deposition and harvest-aid efficacy for UAV application in arid cotton areas in Xinjiang, China

Wang

Chen

et al. 2022

International Journal of Agricultural and Biological Engineering

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With the development of Unmanned Aerial Vehicle (UAV) sprayers, the application of low-volume spraying of harvest-aid and other agrochemicals to cotton using UAVs is becoming a new agronomic trend worldwide. The effect of spray volume and canopy density for UAV spraying is significant but was rarely studied. In this study, five representative spray volumes were explored to examine the effect of spray volume on deposition and harvest-aid efficacy for cotton using a UAV sprayer. To explore the effect of canopy density, similar tests were carried out in a field located nearby with a lower leaf area index (LAI). A conventional trailer boom sprayer was selected for comparison. Different spray volumes had a significant effect on defoliation, but had no significant effect on boll opening and fiber quality. A higher defoliation rate was achieved in the lower LAI field. The total rate of defoliation using the UAV was inferior to the boom sprayer in the high LAI field for lower deposition and defoliation rate in the lower canopy. Considering the deposition, defoliation rate, and working efficiency, a spray volume of 15.0 L/hm 2 with an average droplet size of 150 μm is recommended for UAV application.

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“…However, utilizing UAVs to collect the water level data is a cheap, easy to implement, and on-demand solution [1]. In the field of agriculture, UAVs can help to dispense the pesticides more efficiently and accurately, which improves the biological efficacy, reduces insecticide resistance, and protects the environment [2]. In the parcel delivery industry, the application of drones has revealed its beneficial attribute compared to the ordinary delivery model in terms of low delivery cost, reduced maintenance cost, less labor-intensive, as well as fast delivery [3].…”

Section: Introductionmentioning

confidence: 99%

“…PhD candidate, School of Mechanical and Aerospace Engineering, (contact: qing001@e.ntu.edu.sg) 2. PhD candidate, AIAA member, Air Traffic Management Research Institute, (contact: M200057@e.ntu.edu.sg) 3.…”

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confidence: 99%