Interação pontas-adjuvantes na estimativa do risco potencial de deriva de pulverizações

Madureira, Ronaldo Porto; Raetano, Carlos Gilberto; Cavalieri, J.D.

doi:10.1590/1807-1929/agriambi.v19n2p180-185

Cited by 16 publications

(24 citation statements)

References 14 publications

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“…Neste experimento, foi observado que o emprego da ponta antideriva (DLI) proporcionou maior uniformidade quando comparada aos outros modelos. O mesmo foi verificado para a ponta jato plano com indução de ar, a qual produziu espectro de gotas mais uniforme em comparação à ponta jato plano inclinado (MADUREIRA; RAETANO;CAVALIERI, 2015).…”

Section: Resultados E Discussõesunclassified

Interações Entre Adjuvante E Pontas Hidráulicas No Controle Da Deriva De Glifosato

et al. 2019

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RESUMO:Objetivou-se com este trabalho analisar as interações entre adjuvante e pontas hidráulicas no controle da deriva de glifosato. Primeiramente, avaliou-se o espectro de gotas, empregando-se o delineamento inteiramente casualizado (DIC), em parcela subdividida, avaliandose quatro soluções de aplicação (Parcelas): água; água + óleo mineral; água + glifosato; água + óleo mineral + glifosato e três modelos de pontas tipo leque(Subparcelas): simples (SL); duplo (DL) e duplo com indução de ar (DLI), com seis repetições. Determinou-se o diâmetro da mediana volumétrica; densidade de gotas; amplitude relativa e o potencial risco de deriva. Na etapa seguinte à deriva foi quantificada em túnel de vento, empregando o DIC em parcela sub subdividida, sendo avaliadas as quatro soluções de aplicação (Parcelas), os três modelos de pontas (Subparcelas), em duas velocidades de vento (Sub subparcelas): 1,0 e 2,0 m s -1 , com quatro repetições. Independentemente da solução de aplicação, a ponta DL apresentou os maiores valores de deriva, seguida da SL e DLI, respectivamente. A solução de aplicação água + óleo mineral + glifosato, proporcionou os menores valores de deriva para todas pontas hidráulicas avaliadas. A interação do glifosato com o óleo mineral, aplicado com a ponta DLI, tem potencial para reduzir a deriva no campo.Palavras-chave: tecnologia de aplicação, túnel de vento, espectro de gotas, redução de perdas, controle de qualidade. INTERACTIONS BETWEEN ADJUVANT AND HYDRAULIC NOZZLES IN THE CONTROL OF GLYPHOSATE DRIFTABSTRACT: The aim of this work was to analyze the interactions between adjuvant and the hydraulic nozzle in glyphosate drift control. Firstly, the droplet spectrum was evaluated using a completely randomized design (DIC) in a split plot, evaluating four application solutions (plots): water; water + mineral oil; water + glyphosate; water + mineral oil + glyphosate and three nozzle spray models (subplots): simple (SL); double (DL) and double with air induction (DLI), with six repetitions. The diameter of the volumetric median was determined; droplet density; relative amplitude and the potential risk of drift. In the following stage the drift was quantified in a wind tunnel, using the sub-subdivided DIC, being evaluated the four application solutions (parcels), the three nozzle spray models (subplots), in two wind speeds (sub-plots): 1.0 and 2.0 m s-1, with four repetitions. Regardless of the application solution, the DL tip presented the highest drift values, followed by SL and DLI, respectively. The application solution water + mineral oil + glyphosate, provided the lowest drift values for all hydraulic tips evaluated. The interaction of glyphosate with mineral oil, applied with the DLI tip, has the potential to reduce drift in the field.

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Section: Resultados E Discussõesunclassified

Interações Entre Adjuvante E Pontas Hidráulicas No Controle Da Deriva De Glifosato

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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“…However, the greater relative amplitude of the drops population (SPAN) of TTI11003-VP explains the fact that it showed the highest average to volumetric median diameter, but not the smallest one to PRD. Therefore, the higher the SPAN, the greater the variation in the drop diameters generated in the spraying (Madureira et al 2015). In contrast, the JSF11003 spray nozzle produced the lowest average to volumetric median diameter (166.83 μm), being 2.89 times lower than those for the hydraulic nozzles with air induction, and, consequently, presented a PRD 5.51 times higher (43.39 %).…”

Section: Hydraulic Nozzlesmentioning

confidence: 93%

Reduction in the spray drift of 2,4-D in tomato using hydraulic nozzles with air induction and LI-700 adjuvant

Júnior

Ruas

Reis

et al. 2018

Pesqui. Agropecu. Trop.

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The drift of hormonal effect herbicides is a major problem for agriculture, because, even in small amounts, it may cause high losses in crops with plants that are sensitive to their action mechanism. This study aimed to evaluate the efficiency of hydraulic spray nozzles with air induction, as well as the use of the LI-700 adjuvant, in the reduction of the 2,4-D herbicide drift, in tomato crop. A complete randomized split-plot experimental design, with eight replications, was used. Two herbicide solutions were assigned in the plots (with or without the use of adjuvant) [2,4-D (670 g ha-1) and 2,4-D (670 g ha-1) + LI-700 (712.88 g ha-1)], and, in the subplots, five nozzle models [simple fan (JSF11003), simple fan with air induction (AD-IA11003), dual fan with air induction (AD-IA/D11003), simple hammer fan with air induction (TTI11003-VP) and empty cone with air induction (CV-IA10003). The treatments were applied in a wind tunnel, under a pressure of 300 kPa. In a laser analyzer, applying only water, the volumetric median diameter, the relative amplitude and the percentage of drops with diameter lower than 150 µm were measured for all nozzle models. The CV-IA10003 and TTI11003-VP hydraulic nozzles outstand by reducing the 2,4-D herbicide drift and decreasing the damage to tomato plants. The addition of the LI-700 adjuvant to the 2,4-D syrup, independently of the nozzle model, reduces the drift of this herbicide and its effects on the tomato plant root. However, even when adopting these technologies, the application of the 2,4-D herbicide near the tomato crop should be avoided.

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Interação pontas-adjuvantes na estimativa do risco potencial de deriva de pulverizações

Cited by 16 publications

References 14 publications

Interações Entre Adjuvante E Pontas Hidráulicas No Controle Da Deriva De Glifosato

Interações Entre Adjuvante E Pontas Hidráulicas No Controle Da Deriva De Glifosato

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

Reduction in the spray drift of 2,4-D in tomato using hydraulic nozzles with air induction and LI-700 adjuvant

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