CFD simulation of pesticide spray from air-assisted sprayers in an apple orchard: Tree deposition and off-target losses

Hong, Suk-Jin; Zhao, Lingying; Zhu, Heping

doi:10.1016/j.atmosenv.2017.12.001

Cited by 72 publications

(51 citation statements)

References 29 publications

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“…These source terms were calculated only for the grid cells located within the trees. This modelling method and the details of the source terms for momentum loss and turbulence generation due to tree canopies are described well by Hong et al [14,16]. The CFD simulations were performed using ANSYS Fluent CFD code (version 18.2, Ansys, Inc., Canonsburg, PA, USA).…”

Section: Orchard Parameters and Computational Domainmentioning

confidence: 99%

Thermofluid Modelling of Large-Scale Orchards for Optimal Design and Control of Active Frost Prevention Systems

2020

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Accurate modelling and simulation of temperature dynamics in large-scale orchards is important in many aspects, including: (i) for the calculation of minimum energy required to be used in optimal design of active frost prevention energy systems (fully renewable or partially renewable) to prevent freezing of fruit flowers, buds, or leaves; (ii) for testing frost prevention control systems before real-implementation which regulate active heating systems inside orchards targeted to prevent frost. To that end, in this study, first, a novel and sophisticated parametric computational thermofluid dynamics (CTFD) model for orchard air thermal dynamics for different orchard parameters (such as fruit type, climate, number of trees, their sizes, and distance between them) and boundary/initial conditions was developed and validated with field data from the literature. Next, the use of the developed parametric CTFD model was demonstrated through a case study to calculate the minimal thermal energy required to prevent frost under different frost levels in a test Prunus armeniaca orchard located in Malatya, Turkey, which is the world capital for dry apricot production.

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Section: Orchard Parameters and Computational Domainmentioning

confidence: 99%

Thermofluid Modelling of Large-Scale Orchards for Optimal Design and Control of Active Frost Prevention Systems

2020

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“…These high‐volume conventional sprayers with their coarse nozzles and low spray quality cause major pesticide losses as well as environmental pollution . Problems with pesticide residues as a result of very low effectiveness (less than 50% availability) have therefore attracted a great deal of attention . The efficiency of these sprayers is also very low due to high labour intensity and the high occupational risk of exposure .…”

Section: Introductionmentioning

confidence: 99%

“…12 Problems with pesticide residues as a result of very low effectiveness (less than 50% availability) have therefore attracted a great deal of attention. 13,14 The efficiency of these sprayers is also very low due to high labour intensity and the high occupational risk of exposure. 15 In the past 10 years, a number of spraying techniques have therefore been developed or modified with the aim of increasing deposition effectiveness, while reducing pesticide residues and operator exposure.…”

Section: Introductionmentioning

confidence: 99%

Application method affects pesticide efficiency and effectiveness in wheat fields

Xiao

Chen

Fan

et al. 2019

Pest Management Science

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BACKGROUND There is an urgent need to enhance pesticide effectiveness while reducing adverse environmental impacts, based on the pesticide reduction program that requires net zero growth in chemical pesticide applications by 2020. Agricultural production can benefit from appropriate pesticide application using the optimal method. In this study, the effects of different application methods on the effectiveness, spray deposition, and residue behaviour of 48% phenamacril · tebuconazole suspension concentrate (SC) in wheat production were compared to determine the most efficient and effective method. RESULTS 48% phenamacril · tebuconazole SC was most effective in controlling Fusarium head blight (FHB) and mycotoxin contamination. Statistically significant differences in the control effect, spray deposition, initial residues, and half‐life (t1/2) were subsequently observed with different application methods, suggesting that the application method plays a key role in pesticide availability and control efficiency. The differences in control efficiency and pesticide residues between application methods were thought to be related to droplet size, droplet distribution, and penetrability. Unmanned aerial vehicle and mister sprayers were found to effectively increase the control efficacy of 48% phenamacril · tebuconazole SC in terms of FHB control and mycotoxin concentrations, as well as enhancing pesticide availability. CONCLUSION These findings are of theoretical and practical value for the scientific application of pesticides in wheat, helping to enhance pesticide utilization while reducing harmful residues. © 2019 Society of Chemical Industry

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“…Therefore, many strategies, mainly different application techniques, have been developed to improve the amount of pesticide deposited on the target plant . To evaluate spraying efficiency, it is imperative that a facile methodology is developed to assess the performance of different spraying techniques in terms of distribution and the amount of product deposited on target crops …”

Section: Introductionmentioning

confidence: 99%

“…2,3 To evaluate spraying efficiency, it is imperative that a facile methodology is developed to assess the performance of different spraying techniques in terms of distribution and the amount of product deposited on target crops. [4][5][6] When assessing spray deposition, if pesticides themselves are used in each application scenario, different analytical methods are needed to determine the pesticide deposited on the target crops due to the different physicochemical properties of each pesticide. This is time and cost prohibitive.…”

Section: Introductionmentioning

confidence: 99%

Water‐soluble food dye of Allura Red as a tracer to determine the spray deposition of pesticide on target crops

Gao

Wang

Zhou

et al. 2019

Pest Management Science

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BACKGROUND Quantification of spray deposition on a target crop is of vital importance to optimize pesticide application. In traditional determinations of spray deposition, a large amount of organic solvent is used to extract pesticides from the target crops. In this study, a water‐soluble food dye of Allura Red was developed as a tracer to determine pesticide spray deposition on a rice target crop. RESULTS The addition of Allura Red does not obviously alter the physicochemical properties of pesticides (viscosity, density and surface tension) and droplet spectra. An ultra‐performance liquid chromatography (UPLC) analytical method was developed and validated to determine the deposition amount of Allura Red on rice plants. Method accuracy and precision for Allura Red were found to be satisfactory with recoveries of 96.07% to 107.48%. To validate the method, comparative deposition analyses were carried out using representative systematic and non‐systematic pesticides (nitenpyram and chlorothalonil) under the same spraying scenarios using a Potter spray tower. Allura Red and pesticides showed comparable deposition under the same application conditions with ratios from 0.98 to 1.21. A field trial using an unmanned aerial vehicle sprayer further indicated that the deposition rates for Allura Red and nitenpyram on rice seedling were 13.04% and 11.07%, with corresponding relative standard deviation values (n = 5) of 16.39% and 18.79%. CONCLUSION A laboratory test and field trial confirmed that the developed method of using Allura Red as a tracer for spray deposition assessment is feasible and practicable. © 2019 Society of Chemical Industry

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CFD simulation of pesticide spray from air-assisted sprayers in an apple orchard: Tree deposition and off-target losses

Cited by 72 publications

References 29 publications

Thermofluid Modelling of Large-Scale Orchards for Optimal Design and Control of Active Frost Prevention Systems

Thermofluid Modelling of Large-Scale Orchards for Optimal Design and Control of Active Frost Prevention Systems

Application method affects pesticide efficiency and effectiveness in wheat fields

Water‐soluble food dye of Allura Red as a tracer to determine the spray deposition of pesticide on target crops

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