Modelling pesticide flow and deposition from air-assisted orchard spraying in orchards: A new integrated CFD approach

Endalew, Ayenew Melese; Debaer, C.; Rutten, N.; Vercammen, J.; Delele, Mulugeta Admasu; Ramón, Herman; Nicolaı̈, Bart; Verboven, Pieter

doi:10.1016/j.agrformet.2010.07.001

Cited by 63 publications

(37 citation statements)

References 32 publications

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“…Differences among air jet characteristic of sprayers using different fan technologies can nowadays be successfully described by using the three-dimensional computational fluid dynamics modelling (CDF) based on the Lagrangian particle transport concept. Some CDF models for describing the differences in kinetics of air jets produced by axial-fan or radial-fan sprayers with the aim to support the technical improvements at drift reduction are being developed (Delele et al 2007;Endalew et al 2011Endalew et al , 2012. During the development of the mentioned models, the same type of ATR nozzle was used as in our research and that showed that the droplet trajectories and the disintegration pattern of droplets sprayed in the air jets of axial or radial fan are different because of the differences in initial air velocities, shape of plum and in the pattern of air plum kinetic energy dispersal and decline.…”

Section: Results Of Drift Assessment During Spring Applicationsmentioning

confidence: 99%

Interactions between spray drift and sprayer travel speed in two different apple orchard training systems

Stajnko

Vajs

2014

Int. J. Environ. Sci. Technol.

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Trials were carried out in apple orchards of two different training systems to assess the relationship between spray drift and parameters of spraying with an emphasis on the sprayer's travel speed when applying different solutions, such as pesticides or fertilizers, onto the apple trees. The assessments were based on the following factors: per cent of spay drift, two sprayers (axial-and radial-fan sprayer), two training systems (super spindle and modified slender spindle), spray droplet size (fine or coarse droplets) and the sprayer's travel speed (5 vs. 10 km h -1 ). The studies were conducted in the spring and summer seasons under similar external weather conditions to test any seasonal effects that might occur. In this paper, all tested factors and interactions were found to have a significant effect on the spray drift during spray application. For instance, the increase in sprayer speed reduced the spray drift percentage. Other factors, such as sprayer type (axial fan and radial fan) and tree training system, had an impact on spray drift as well.

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Section: Results Of Drift Assessment During Spring Applicationsmentioning

confidence: 99%

Interactions between spray drift and sprayer travel speed in two different apple orchard training systems

Stajnko

Vajs

2014

Int. J. Environ. Sci. Technol.

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“…For example, researchers have evaluated the deposition ratio of pesticides on fruit trees (whole plants, canopies, leaves, etc.) and the ground under different scenarios, such as different sprayer types, application methods, fruit tree conditions, and weather conditions under open orchard conditions or in indoor artificial orchards . Studies have shown that most of the pesticides will be lost to the environment in the orchard after spray treatment, and using spray treatment only 29–56% of the pesticide reached the canopy and less than 0.4% reached the target pests .…”

Section: Introductionmentioning

confidence: 99%

Spatial and temporal distribution, degradation, and metabolism of three neonicotinoid insecticides on different parts, especially pests' target feeding parts of apple tree

Dong

Chen

et al. 2020

Pest Management Science

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BACKGROUND: Neonicotinoid insecticides (NIs) have been recently banned in some countries because of increased pest resistance and deleterious risks to non-target organisms. Recent studies considered all parts of crops as a whole part in plant protection. However, there are few reports focused on the distribution and metabolic trends of NIs on target feeding sites of different pests in apple orchards. RESULTS:The spatial and temporal distribution, absorption, degradation, and metabolism of three NIs, imidacloprid, acetamiprid, and thiamethoxam, on different parts of apple trees were studied under foliar spray and root irrigation treatments. In the spray treatment, the initial average concentration ratios (TCRs) were 31.6% for lower shoots, 23.3% for upper leaves, 23.2% for upper shoots, 21.0% for lower leaves, and 0.5% and 0.4% for upper and lower fruits, respectively. The average half-lives of the three NIs were 2.9 days for shoots, 7.4 days for leaves, and 10.8 days for fruits. The degradation rate of shoots was 2.5 times that of leaves, and 3.6 times that of fruits. Imidacloprid olefin and N-methyl acetamiprid were two of the main metabolites. In the root treatment, both roots and soils had high TCRs during the whole sampling period. Only imidacloprid was transmitted to above-ground parts of the plants, with TCRs of 0.38-50.94%.CONCLUSION: This study found significant differences in spatial and temporal distribution, degradation, metabolism, and trends of NIs on different pest target sites of apple trees. The data obtained may help promote scientific control of target pests and evaluation of safety for non-target species in orchards.

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“…The use of experimental methods to characterize the product distribution by a sprayer would be difficult and expensive [4]. The characteristics of the plume generated by the sprayer can be simulated by applying integrated computational fluid dynamics (CFD) [5,6]. However, experimental methods are required to validate such simulations and to determine two critical physical features: first, the deposition of the product as a function of distance, which is related to the spray drift, and second, the product distribution in the vicinity of the machine, which must be in accordance with the position and geometry of the tree to be treated.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, laser technology allows real-time monitoring of airborne spray drift, obtaining range-resolved images of the spray plume while requiring fewer personnel and consuming less time than traditional methods, as in the case of light detection and ranging (LIDAR) technology [18]. This technology has been successfully applied to measure the pesticide plumes in fruit orchards [5].…”

Section: Introductionmentioning

confidence: 99%

Applicability of a 3D Laser Scanner for Characterizing the Spray Distribution Pattern of an Air-Assisted Sprayer

et al. 2018

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Three-dimensional (3D) laser technology has been tested for assessing the performance of air-assisted spraying. A static test using an air-assisted sprayer equipped with two axial fans (front and back) with opposing directions of rotation was developed. The sprayer was adjusted to spread water in a static mode, at a pressure of 10 bars, with four air volumetric flow rates. Measurements were performed using a Leica HDS6000 3D laser scanner. In addition, the flow and velocity of air generated by the air-assisted sprayer were measured using a hot-wire anemometer and a 3D sonic anemometer with the objective of estimating the influence of air flow on the spatial distribution of spray droplets. To carry out the analysis, all of the droplets detected by the laser were considered to be of the same size. The distribution of products was asymmetric when the machine only worked with the back fan, with 41% of the product distributed on the left side versus 59% on the right side, as referenced to the direction of the machine’s advance. This asymmetry was corrected when the machine functioned with the two fans activated. These spray data were concordant with the measured air flow generated by the machine in the different working conditions. For the different regulation settings of the machine, taking the vertical of the machine as 0°, the angular region comprised between 40° and 60° was the one that received the highest quantity of product. The increase of the air flow produced a greater distance of the product. For the highest air flow configuration, 99% of the product detected by the laser was detected within a distance of 16 m from the axis of the machine.

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Modelling pesticide flow and deposition from air-assisted orchard spraying in orchards: A new integrated CFD approach

Cited by 63 publications

References 32 publications

Interactions between spray drift and sprayer travel speed in two different apple orchard training systems

Interactions between spray drift and sprayer travel speed in two different apple orchard training systems

Spatial and temporal distribution, degradation, and metabolism of three neonicotinoid insecticides on different parts, especially pests' target feeding parts of apple tree

Applicability of a 3D Laser Scanner for Characterizing the Spray Distribution Pattern of an Air-Assisted Sprayer

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