Assistência de ar em barra de pulverização no controle da ferrugem asiática da soja

Christovam, Rafael de Souza; Raetano, Carlos Gilberto; Aguiar, H. O.; Dal-Pogetto, Mario Henrique Ferreira do Amaral; Prado, Evandro Pereira; Gimenes, Marcos Aparecido; Kunz, Vilson Luís

doi:10.1590/s0006-87052010000100029

Cited by 14 publications

(4 citation statements)

References 7 publications

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“…This result may be because the leaflets on the upper portion of the soybean plant intercepted the droplets, so that the droplets could not properly penetrate the plant independently of the volume used. Similar results were reported by Prado et al (2010) and Christovam et al (2010), who evaluated fungicide deposits in soybean plants. Souza et al (2007) state that, in addition to the overlapping plant leaves, evaporation and drifting processes also may make it difficult for the droplets to reach the leaf surface, resulting in the variable deposition efficiency of the product over the leaf surface.…”

Section: Mixture Deposition and Leaf Coveragesupporting

confidence: 90%

<b>The mixture volume sprayed by hydraulic and centrifugal energy nozzles for the control of Asian soybean rust

et al. 2015

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ABSTRACT. The objective of this work was to evaluate a means of controlling ASR (Phakopsora pachyrhizi H. Sydow & P. Sydow) by applying reduced fungicide volumes in association with spray nozzles using either hydraulic or centrifugal energy. Two experiments resulted from that objective: soybean plants (Glycine max (L.) Merril) of the 'BRS Valiosa RR' cultivar were grown at the Experimental Farm of the University of São Paulo State (Unesp) in Jaboticabal, Brazil. The treatments were distributed in the field according to a randomized complete block design with four replications. The treatments consisted of the volumes of 50, 100, and 150 L ha with the droplets formed by centrifugal energy was the least efficient and resulted in the highest rust severity and the lowest grain yield.Keywords: spray nozzle, coverage, deposition, Glycine max, Phakopsora pachyrhizi, disease severity.Volume de calda em pulverização por energia hidráulica e centrífuga empregado no controle da ferrugem asiática da soja RESUMO. O objetivo da realização deste trabalho foi avaliar o controle da ferrugem asiática da soja (Phakopsora pachyrhizi H. Sydow & P. Sydow) em função do uso de menores volumes de aplicação associados a bicos de pulverização de energia hidráulica e centrífuga. Foram conduzidos dois experimentos com a cultura da soja (Glycine max (L.) Merril) cultivar "BRS Valiosa RR', em área experimental da Unesp, Câmpus de Jaboticabal, São Paulo, no delineamento de blocos ao acaso com sete tratamentos e quatro repetições. Os tratamentos foram constituídos pelos volumes de 50, 100 e 150 L ha -1 (gotas produzidas por energia hidráulica) e 17, 35 e 50 L ha -1 (gotas produzidas por energia centrífuga), mais um tratamento adicional sem aplicação do fungicida. O volume de 150 L ha -1 com gotas formadas por energia hidráulica proporcionou maior controle do patógeno pelo fungicida azoxystrobina e cyproconazole em relação aos demais tratamentos. Aplicações com o volume de 17 L ha -1 com gotas formadas por energia centrífuga foi menos eficiente com maior severidade da ferrugem asiática e menor produtividade.Palavras-chave: bico de pulverização, cobertura, deposição, Glycine max, Phakopsora pachyrhizi, severidade da doença.

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Section: Mixture Deposition and Leaf Coveragesupporting

confidence: 90%

<b>The mixture volume sprayed by hydraulic and centrifugal energy nozzles for the control of Asian soybean rust

et al. 2015

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“…The Vortex ® system is an important tool that permits adjustments in the control of spray drift (Bauer & Raetano, 2000); however, there is no consistency in its performance. In previous studies, the Vortex ® system was shown to increase the deposition of a spray mixture inside the canopy of a soybean crop (Baesso et al, 2014), as well as to improve the control of soybean rust, increasing the yield and the mass per thousand soybean grains (Christovam et al, 2010;Prado et al, 2010). On the other hand, cases have been reported wherein such assisted methods did not influence spray deposition levels (Aguiar Júnior et al, 2011), and in some studies, air-assisted boom spraying had no effect on the performance of agrochemicals, in that it did not potentiate nor did it compromise the control levels of phytopathogenic fungi (Oliveira et al, 2016).…”

Section: Resultsmentioning

confidence: 99%

“…Therefore, when the canopy is more open, there may be no influence of the air curtain, which is mainly useful only with a closed canopy at the more advanced stages of crop development. In addition, the performance of the Vortex ® system is influenced by the features of the application technology used, such as the air curtain speed (Aguiar Júnior et al, 2011), uniform distribution of air along the boom, angle of the spray nozzles, airflow in relation to the spray direction (Christovam et al, 2010), and the size spectrum of the droplets applied (Matthews et al, 2014).…”

Section: Resultsmentioning

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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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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“…Repetindo o que ocorreu para a análise de cobertura foliar, observa-se valores muito baixos de depósito para os estratos médio e inferior das plantas, provavelmente devido ao alto enfolhamento da cultura (IAF=7.1) que pode ter dificultado a chegada das gotas até as porções mais internas da planta, conforme relatado por Christovam et al (2010).…”

Section: Estrato Inferiorunclassified

Influência de diferentes pontas de pulverização nas aplicações terrestres em alta velocidade na cultura da soja (Glycine Max)

Zaidan¹

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Assistência de ar em barra de pulverização no controle da ferrugem asiática da soja

Cited by 14 publications

References 7 publications

<b>The mixture volume sprayed by hydraulic and centrifugal energy nozzles for the control of Asian soybean rust

<b>The mixture volume sprayed by hydraulic and centrifugal energy nozzles for the control of Asian soybean rust

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

Influência de diferentes pontas de pulverização nas aplicações terrestres em alta velocidade na cultura da soja (Glycine Max)

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