Taxa de aplicação e uso de surfactante siliconado na deposição da pulverização e controle da ferrugem da soja

Prado, Evandro Pereira; Raetano, Carlos Gilberto; Pogetto, Mário H. F. do A. Dal; Costa, Saulo I. de A; Christovam, Rafael de Souza

doi:10.1590/1809-4430-eng.agric.v35n3p514-527/2015

Cited by 21 publications

(15 citation statements)

References 20 publications

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“…Besides using assisted boom sprayer systems, the deposition and coverage of the leaf surface by sprayed chemicals can be maximized by adjusting other factors, such as: the spectrum of the droplets (Silva et al, 2014, Weber et al, 2017França et al, 2018), spray pressure (Cunha et al, 2016), spray nozzle type (Cunha et al, 2014;Madureira et al, 2015;Cunha et al, 2016, Durão & Boller, 2017, adding adjuvants to the spray (Cunha et al, 2014;Madureira et al, 2015;Oliveira et al, 2016), and changing the volume of the mixture (Cunha et al, 2014;Prado et al, 2015;Weber et al, 2017;Roehrig et al, 2018).…”

Section: Resultsmentioning

confidence: 99%

“…In general, conventional spray techniques using hydraulic or centrifugal nozzles, regardless of the application volume, provide low deposition and coverage in the middle and lower thirds of the plant, especially in plants with high leaf areas like soybean, causing the applied products to have low efficiency (Prado et al, 2015; Engenharia Agrícola, Jaboticabal, v.39, n.2, p.198-207, mar./apr. 2019 Graziano et al, 2017;Roehrig et al, 2018;Müller et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

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Deposition and Coverage of Soybean Leaf Surfaces by Sprays Applied Using Different Assisted Boom Sprayer Systems

et al. 2019

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Maintaining homogeneity in the distribution of fungicidal sprays applied throughout the plant, minimizing the variation between the upper and lower third of the plant, is one of the main challenges for application technologies with regard to soybean crops. To increase the deposition and leaf coverage of sprayed compounds, especially in the middle and lower thirds of the plant, we developed and tested alternative assisted boom sprayer systems. In this study, three assisted boom sprayer systems (Vortex ® , Dropleg ® , and chain curtain) were evaluated, in addition to the conventional system, in terms of the deposition and coverage of the leaf surface they achieved in the upper, middle, and lower thirds of plants using the fluorescent tracer Helios SC 500™. The assisted boom sprayer systems allowed the sprayed mixture to be better distributed throughout the plant. With the conventional spray system (without assitance), the deposition in the upper third was approximately 26 times higher than that in the lower third, whereas with the use of the assisted boom sprayer systems, the difference in deposition between these thirds was 11 times higher. Among the evaluated systems, the Dropleg ® system presented the lowest depositional variation, which was only 5.5 times higher in the upper than in the lower third, because of the increased deposition achieved in the lower third of the plant. Leaf coverage varied from 41% to 81% in the upper third, from 24% to 43% in the middle third, and from 4% to 13% in the lower third of the plant. Using the conventional spray system, the leaf surface coverage was approximately 13 times higher in the upper third than in the lower third of the plant, whereas with the use of the assisted boom sprayer systems, especially the Dropleg ® system, this variation was reduced by 73%, and the coverage of the upper and lower thirds only differed by 3.5 times. Indeed, the Dropleg ® system reached a leaf coverage of close to 13% in the lower third of the plant. The use of assisted boom sprayer systems improved the distribution of the mixture applied throughout the plant, reducing the differences among the thirds of the plant both in the levels of deposition and coverage of the leaf surfaces. The Dropleg ® system increased the deposition and leaf coverage in the lower third of the plant the most, facilitating better distribution of the mixture.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Deposition and Coverage of Soybean Leaf Surfaces by Sprays Applied Using Different Assisted Boom Sprayer Systems

et al. 2019

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“…The contrasting and variable effects on the Vortex ® system may be associated with the different canopy opening levels, which can be influenced by the plant arrangement (Holtz et al, 2014), depending on the characteristic of the cultivar Tormen et al, 2012), as well as by the time of the day of spraying, due to the variation of the horizontal angle of soybean leaves throughout the day (Graziano et al, 2017;Moura et al, 2017). Moreover, the spray tip angle, droplet size and speed, adjuvants and mixture volume are factors that also influence droplets' penetration along the canopy of the plant (Cunha et al, 2014, Madureira et al, 2015Prado et al, 2015;Cunha et al, 2016;Weber et al, 2017, França et al, 2018.…”

Section: Resultsmentioning

confidence: 99%

Chemical Control of Asian Soybean Rust as a Function of Cultivar, Row Spacing and Spray Bar Support Systems

Hoffmann¹,

Roehrig

Boller

et al. 2019

Eng. Agríc.

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Product deposition and foliar surface cover are highly impacting factors on the efficiency of foliar fungicides applied to soybean cultivars, due to their low mobility, with side effects on Asian soybean rust (ASR) control. Spray bar support systems, such as the air curtain (Vortex ® ) and the use of nozzles along the bar (Dropleg ® ), stand out as an alternative to obtain a better distribution of fungicide throughout the plant. In this study, two spray bar support systems (Vortex ® and Dropleg ® ) were, therefore, evaluated and compared with the conventional spraying method based on the biological efficacy in ASR control. In order to do this, two harvests, with three spacing between rows and two cultivars were employed. Vortex ® and Dropleg ® spray bar support mechanisms do not effectively contribute to the optimization of Asian soybean rust control or to the grain crop yield, regardless of cultivar and row spacing. Decreasing the row spacing did not influence the level of control of Asian soybean rust, as the highest grain yield was obtained with the smallest spacing. The cultivar with genetic resistance to Asian rust showed lower levels of this disease, thus, greater control against the use of fungicides.

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“…The addition of surfactant adjuvants to the tank mixture can optimize the efficiency of the applications, since these can improve mainly the adherence and the spreading of the drops containing the fungicide on the target (Cunha et al, 2014), once reduces the surface tension of the solution and consequently the contact angle of the drops with the surfaces, increasing the coverage (Spanoghe et al, 2007;Prado et al, 2015). The oil-based adjuvants, associated with surfactants, have positive effects as wetting, spreading, penetrating, anti-evaporating, besides improving translocation, retention and adhesive effect Prado et al, 2015). Thus, the combination of both surfactant and oil-based adjuvants appears as an alternative to optimize the fungicide effect.…”

Section: Introductionmentioning

confidence: 99%

Use of Surfactant With Different Volumes of Fungicide Application in Soybean Culture

et al. 2018

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Application volume, adjuvants that act on the drop surface tension and droplet spectrum are the main factors affecting leaf surface coverage and the spray penetration droplets inside the canopy of the soybean crop, which may have an impact on fungicide efficiency, since those used in the handling of Asian-rust, including those that are absorbed by the plant, present a small displacement from the point of deposition. Thus, it was sought to determine the impacts on the use of the organosilicone surfactant compared to the changes in the spray volumes. For that, five spray volumes and the combination of two adjuvants were compared in randomized blocks with a factorial arrangement 5x2. Reductions in volume negatively impacted the number of drops cm-2 affecting the leaf surface cover which did not exceed 13% in the lower third, in the absence of the surfactant. Also, the reduction in the volume provided decreases in the control of Asian-rust, and the use of surfactant minimized the negative impacts of the disease, reflecting on the index of the leaf area which varied up to 6.5 times on changes in the spray volume, and up to 2.8 times against the use of the surfactant in relation to the mineral oil isolated. Grain yield was negatively affected as reductions in the spray volumes, occurred with less impact when the surfactant was used. Thus, coverage of the leaf surface and the number of drops cm-2 along the plant profile respond to the addition of the surfactant and to the increase of the spray volume, having relation with the control of soybean Asian-rust, and affecting the leaf area index and productivity.

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Taxa de aplicação e uso de surfactante siliconado na deposição da pulverização e controle da ferrugem da soja

Cited by 21 publications

References 20 publications

Deposition and Coverage of Soybean Leaf Surfaces by Sprays Applied Using Different Assisted Boom Sprayer Systems

Deposition and Coverage of Soybean Leaf Surfaces by Sprays Applied Using Different Assisted Boom Sprayer Systems

Chemical Control of Asian Soybean Rust as a Function of Cultivar, Row Spacing and Spray Bar Support Systems

Use of Surfactant With Different Volumes of Fungicide Application in Soybean Culture

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