Spectrum of droplets produced by use of adjuvants

Sasaki, Robson Shigueaki; Teixeira, Mauri Martins; Alvarenga, Cleyton Batista de; Humberto, Santiago; Maciel, Christiam Felipe Silva

doi:10.4067/s0718-34292013000100004

Cited by 5 publications

(3 citation statements)

References 10 publications

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“…When comparing the VMD of the impacted droplets on hydrosensitive paper and the droplets in transit, an overestimation of the VMD of the impacted droplets was observed, since, as Nascimento (2020) noted, the characterization of the spectra of droplets in transit or VMD was much lower than that observed in hydrosensitive papers, thus, the device read a droplet with an overestimated VMD. The relative amplitude, on the other hand, shows the sprinkler quality of the spectrum, so that the lower the relative amplitude value, the more homogeneous the droplets are (Sasaki et al 2013). All tips evaluated in the present study showed similar droplet homogeneity in the three thirds of the plants.…”

Section: Discussionmentioning

confidence: 50%

Journal of Plant Protection Research

Nascimento,

Parreira,

Milagres

et al. 2022

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An efficient application of phytosanitary products depends, among other factors, on a good selection of nozzles and the application volume rate of the solution used. Thus, the objective of this work was to evaluate the efficiency of different models of hydraulic tips and application volume rates on spray coverage on targets positioned in the upper, middle and lower thirds of corn plants. The application volume rates evaluated were: 50 l • ha −1 ; 100 l • ha −1 ; 150 l • ha −1 ; 200 l • ha −1 ; 300 l • ha −1 and 400 l • ha −1 . The following nozzles were used: TT 11001, TTJ60 11002, TXA 8003, 30HCX 12, GRD120 02 and GAT11002. Appli cations were carried out in phenological stages V6-V7 of corn plants. There was a directly proportional relationship between an increase in application volume rate and the levels of spray coverage and droplet density in the three thirds of corn plants. The application vol ume rate evaluated, except for 50 l • ha −1 in the lower third, provided a number of droplets compatible with the literature recommendations for the application of systemic fungicides. All tips evaluated provided a number of droplets compatible with the recommendations in the literature for the application of systemic fungicides, therefore, they can be recom mended for use in spraying on corn crops.

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Section: Discussionmentioning

confidence: 50%

Journal of Plant Protection Research

Nascimento,

Parreira,

Milagres

et al. 2022

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“…Droplets with initial diameters less than 100 μm are generally considered highly driftable. [37] In this sense, the results of both models agreed that 100 μm droplets were the most susceptible to wind-induced spray drift, depositing at the greatest distances from the nozzle. On the other hand, droplets with initial sizes of 50 μm show a significant tendency to evaporate completely before reaching the ground (i.e., evaporation drift).…”

Section: Parametermentioning

confidence: 55%

Droplet deposition of agrochemical spraying: Comparison of results from a random‐walk model and CFD simulations

Renaudo,

Bucalá,

Bertin

2024

Can J Chem Eng

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The effectiveness of agricultural spraying processes depends considerably on the ability of the atomized droplets to reach the target site in the desired amount. In this work, two mathematical models to study the trajectories and deposition of atomized droplets are implemented and compared. On the one hand, a computational fluid dynamics (CFD) coupled with discrete phase model (DPM) is implemented to calculate the trajectories of atomized droplets and determine distances at which the droplets are deposited. The continuous phase (atmospheric air) is modelled by continuity, momentum, and energy equations. On the other hand, a Lagrangian random‐walk (LRW) model based on force and energy balances to predict the pulverization process of a nozzle is formulated and implemented in Python. Both models take into account the effects of drag, gravity, buoyancy, and evaporation on individual droplets, as well as the impact of atmospheric stability and dispersion. By tracking a large number of trajectories, meaningful estimates of dispersal statistics can be obtained. The LRW model accurately replicated the trajectories, deposition distances, and final diameters of atomized droplets for three atmospheric stability cases, compared with CFD simulation results. The results of both models agreed that 100 μm droplets were most susceptible to wind‐induced spray drift, depositing at the furthest distances from the nozzle. In addition, 50 μm droplets exhibited a significant tendency to evaporate entirely before reaching the ground. The LRW model is found to be a cost‐effective alternative for estimating spray drift compared to the computationally intensive CFD approach.

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“…(Aliverdi and Karami 2020). This is also true for other groups (mode of actions) of herbicides against easy-to-wet species (Knoche 1994;Huang et al 2000;Shaw et al 2000;Sasaki et al 2013;Creech et al 2015;Meyer et al 2016). Due to a low level of energy existing in smaller spray droplets, they can easily be deposited on the leaf surface, leading to greater efficacy of the herbicide (Penner 2000).…”

Section: Resultsmentioning

confidence: 97%

Journal of Plant Protection Research

Aliverdi,

Zarei

2020

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It is challenging to obtain proper leaf wetting. An angled spray could overcome this impediment, but which spray angle is best suited to droplet size is still unknown. In an outdoor pot experiment, seven doses of cycloxydim and sethoxydim were sprayed with single-orifice standard, anti-drift, and air induction (having a fine, medium, and extremely coarse spray quality, respectively) flat fan nozzles, using spray angles of 10°, 20° backward, 0° (vertical), 10°, 20°, 30°, 40°, 50°, and 60° forward relative to the direction of nozzle trajectory on wild barley at the three-leaf stage. Generally, the forward angled spray was better than the backward angled spray. With a standard flat fan nozzle, the forward angling of spray from 0° to 20° reduced the ED 50 from 60.24 to 39.85 g a.i. ⋅ ha −1 for cycloxydim and from 150.51 to 81.13 g a.i. ⋅ ha −1 for sethoxydim. With an anti-drift flat fan nozzle, the forward angling of spray from 0° to 30° reduced the ED 50 from 72.57 to 50.20 g a.i. ⋅ ha −1 for cycloxydim and from 181.94 to 104.51 g a.i. ⋅ ha −1 for sethoxydim. With an air induction flat fan nozzle, the forward angling of spray from 0° to 40° reduced the ED 50 from 102.96 to 45.52 g a.i. ⋅ ha −1 for cycloxydim and from 209.91 to 92.80 g a.i. ⋅ ha −1 for sethoxydim. More angling did not improve the efficacy of these herbicides. Our results revealed that larger spray droplets needed more spray angle than smaller spray droplets to achieve an equal control.

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Spectrum of droplets produced by use of adjuvants

Cited by 5 publications

References 10 publications

Journal of Plant Protection Research

Journal of Plant Protection Research

Droplet deposition of agrochemical spraying: Comparison of results from a random‐walk model and CFD simulations

Journal of Plant Protection Research

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