Deposição da calda na cultura da soja em função de diferentes pressões de trabalho e pontas de pulverização

Cunha, João Paulo Arantes Rodrigues da; Marques, Rodrigo Santos; Alves, Guilherme Sousa

doi:10.1590/0034-737x201663060003

Cited by 24 publications

(21 citation statements)

References 10 publications

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“…Thus, it can be observed that with an increase in the application volume there was a tendency to increase deposition on the upper part of the plants, while it did not necessarily improve the deposition on the middle and lower thirds, where the smaller deposits occurred. The highest retention of the spray mix in the upper sector of the plants, in relation to the middle and/or lower third was verified in other studies on cotton (Scramin et al, 2002;Sousa et al, 2007a;Cavalieri et al, 2015) and with soybean crops (Derkensen et al, 2008;Constantin et al, 2012;Cunha et al, 2016). The deposit averages in the upper third were risen significantly with the increased volume applied up to 140 L ha -1 .…”

Section: Effect Of Spraying Volume On Deposition On Cotton Leavessupporting

confidence: 61%

Spraying deposits using different nozzles and application volumes for pest management of cotton at reproductive stage

et al. 2019

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With the growing need for greater operational capacity, information about the effect of application volume and spray nozzles on the quality of pesticide application are essential to obtain greater efficiency in pest management in cotton crops. This study aimed to assess the effect of the spraying volume and nozzles on the deposition of spray solution on cotton crops at the reproductive stage. The treatments of the first experiment correspond to the 55, 67, 140 and 194 L ha-1 volumes obtained by variation of the displacement speed using the XR11004 flat fan nozzle. In the second assay the treatments corresponded to the applications of MGA9004 (hollow cone), XR11004 (flat fan), AIXR11004 (air induction flat fan) and CVIA04 (air induction hollow cone) nozzles with 120 L ha-1. An artificial brilliant blue food dye (FD&C 1) was used as a tracer (2.5 g L-1) to determine the deposited volumes on the leaves of the upper, middle and lower third of cotton plants. The results showed that increase in the application volume contributed to obtain the larger deposits in the upper third of the cotton crop during its reproductive phase, especially up to 140 L ha-1, but did not exhibit a significant increase of the deposition in the middle and lower thirds of the plants. The MGA9004, XR11004 and AIXR11004 nozzles provided the largest deposits in the three plant sectors. The flat fan nozzles resulted in greater uniformity of deposits in the upper and middle thirds of the plants.

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Section: Effect Of Spraying Volume On Deposition On Cotton Leavessupporting

confidence: 61%

Spraying deposits using different nozzles and application volumes for pest management of cotton at reproductive stage

et al. 2019

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“…Therefore, the droplet size produced by this equipment in the present study indicate a greater efficiency in depositing the spray mixture on the target. Corroborating this result, Cunha, Marques, & Alves, 2016, demonstrated that the spray tip that generated smaller and more uniform droplets was able to deposit more spray mixture throughout the canopy of soybean plants.…”

Section: Resultsmentioning

confidence: 67%

Deposition, Endo-drift and Exo-drift in the Pulverization in Coffee With Different Equipment

Locatelli¹,

Freitas²,

Vitória³

et al. 2019

JAS

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The objective was to evaluate the equipment efficiency in reducing drift and increasing the spray deposition. The experiment was conducted of the conilon coffee plantation, located on the experimental area of the Federal Institute of Espirito Santo, Itapina, Brazil. The experiment was a randomized complete block design with four replications. The treatments consisted: a knapsack sprayer with electrostatic assistance, an electric knapsack sprayer, a knapsack sprayer with a spray shield, and a knapsack sprayer without a spray shield. All sprayers were equipped with a single spray nozzle. Spray deposition was evaluated on wee leaves using a food colourant as a tracer. The knapsack sprayer with electrostatic assistance was the most efficient equipment, providing lower values of drift, and the greatest deposition on the weeds. It is recommended to use the electrostatic sprayer, as it showed greater efficiency in the application of the product on the target, using smaller volume

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“…Reduction of row spacing increased grain yield by approximately 6.5% and 8.6% for the susceptible cultivar (SYN 1363 RR) and for the resistant cultivar (SYN 1365 RR), respectively, by observing the 0.17 m spacing between rows in relation to the other ones (Table 8 and Table 9). One of the main reasons for ineffective ASR control is associated with the target coverage deficiency by the application of fungicides, especially at the lower portion of the plant (Cunha et al, 2014;Silva et al, 2014;Cunha et al, 2016;Moura et al, 2017, Weber et al, 2017. The control efficacy becomes, therefore, compromised, as fungicides for ASR management, although systemic, are translocated to small distances from the deposition point (Reis et al, 2010).…”

Section: Resultsmentioning

confidence: 99%

“…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%

“…During this period, the leaves of the upper strata constitute a physical barrier against the deposition of fungicide droplets inside the canopy, which makes spraying with conventional bars inefficient. Strategies that increase the deposition, mainly in the lower part of the crop are, therefore required (Cunha et al, 2011;Cunha et al, 2014;Cunha et al, 2016;Moura et al, 2017;Weber et al, 2017). These obstacles can be partially overcome with the use of spray bar support equipment.…”

Section: Introductionmentioning

confidence: 99%

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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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Deposição da calda na cultura da soja em função de diferentes pressões de trabalho e pontas de pulverização

Cited by 24 publications

References 10 publications

Spraying deposits using different nozzles and application volumes for pest management of cotton at reproductive stage

Spraying deposits using different nozzles and application volumes for pest management of cotton at reproductive stage

Deposition, Endo-drift and Exo-drift in the Pulverization in Coffee With Different Equipment

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

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