Avaliação Do Depósito De Gotas Obtido Através Da Pulverização Eletrostática E Da Convencional Sobre a Cultura Do Algodoeiro

Silva, Odilon Reny Ribeiro Ferreira da; Marques, Luciano Façanha; Carvalho, O. S.; Vieira, Robson de Macedo

doi:10.1590/1807-1929/agriambi.v1n1p101-105

Cited by 5 publications

(4 citation statements)

References 8 publications

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“…There have been studies with electrostatic spraying where no improvement has been observed in the application (SILVA et al, 1997;SILVA et al, 2000;BAYER et al, 2011 andMAGNO JUNIOR et al, 2011). Silva et al (1997) explained that the induced electric charge was not sufficient to promote greater spray deposition on the target. Bayer et al (2011) suggested that drift and droplet evaporation can reduce the effectiveness of the electrostatic system.…”

Section: Introductionmentioning

confidence: 99%

Control of Dalbulus maidis in maize crop with electrostatic spraying

Marques¹,

Cunha²,

Alves³

et al. 2019

Biosci. J.

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Among the pests that attack the maize, the maize leafhopper, which causes direct damages by sap-sucking and indirect ones, stands out as being a vector of pathogens and viruses, and can cause losses of up to 100% of the production. An alternative to improve the chemical control of this pest is the use of electrostatic spraying technology. However, there is no research support. This study aimed to evaluate the deposition of spray in the maize crop and the effectiveness in the chemical control of the maize leafhopper, using the electrostatic spraying system, at different application rates, compared to the conventional spraying system. The experiment was conducted in a randomized block design with five treatments, in a 2x2 + 2 factorial scheme: presence or absence of electrostatic spraying system, two application rates (35 and 50 L ha-1), an additional treatment using a hydraulic spray nozzle and a rate of 100 L ha-1, and other additional treatment without the application of insecticide, in order to support the study of pest infestation. Each treatment consisted of eight replicates, in which the spray deposition in the maize canopy and the efficiency in the control were evaluated. For the insecticide applications, a boom sprayer with induction electrostatic spraying system was used with indirect electrification. To evaluate the deposition, the Brilliant Blue FCF marker was added to the spray to be detected by absorbance in spectrophotometry. For the biological efficacy of the maize leafhopper, the insecticide composed of thiamethoxam and lambda-cyhalothrin was used compared with the control without the application. There was a significant increase in the spray deposition, both in the upper and lower maize leaves, with the use of electrostatic spray technology compared to the conventional spray system. The control of the maize leafhopper was also superior. The electrostatic spraying also made it possible to reduce the application rate by approximately three times in relation to that used in conventional hydraulic spraying.

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Section: Introductionmentioning

confidence: 99%

Control of Dalbulus maidis in maize crop with electrostatic spraying

Marques¹,

Cunha²,

Alves³

et al. 2019

Biosci. J.

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“…Laryea & No (2005) found an increase of up to 2.51 times on the deposition of liquid using the electrostatic spraying when compared to the results obtained by the use of the conventional system. However, it is noteworthy that there are also studies performed with electrostatic spraying which provided no improvement in the application of pesticides, such as those conducted by Silva et al (1997), Silva et al (2000), Bayer et al (2011) andMagno Júnior et al (2011).…”

Section: Introductionmentioning

confidence: 99%

Parameters of electrostatic spraying and its influence on the application efficiency

et al. 2013

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When the electrostatic spraying is used correctly, it provides advantages over conventional systems, however many factors can affect the system efficiency. Therefore, the objective of this study was to evaluate the charge/mass ratio (Q/M) at different spraying distances (0, 1, 2, 3, 4 and 5 m), and the liquid deposition efficiency on the target. Evaluating the Q/M ratio the Faraday cage method was used and to evaluate the liquid deposition efficiency the artificial targets were positioned longitudinally and transversely to the spray jet. It was found that the spraying distance affects the Q/M ratio, consequently, the liquid deposition efficiency. For the closest distance to the target the Q/M ratio was 4.11 mC kg-1, and at distances of 1, 2, 3, 4 and 5 m, the ratio decreased to 1.38, 0.64, 0.31, 0.17 and 0.005 mC kg-1, respectively. For the liquid deposition, the electrostatic system was affected by the target orientation and spraying distance. The target transversely to the jet of liquid did not improve the liquid deposition, but longitudinally increased the deposition up to 3 meters of distance.

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“…Obteve-se maior porcentagem de cobertura devido à quantidade de massa foliar, fato encontrado por Silva et al (1997) em estudo da população de gotas na cultura do algodoeiro. Para as pontas de pulverização observa-se pequena diferença de 4,5%, o que indica que o tipo de jato utilizado não influencia na porcentagem de cobertura, o que concorda com Souza (2006), que não observou diferença na cobertura entre ambas as pontas.…”

Section: Román Runclassified

Cobertura Da Cultura Da Soja Pela Calda Fungicida Em Função De Pontas De Pulverização E Volumes De Aplicação

Román

Cortez

Ferreira

et al. 2009

RSA

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RESUMOO objetivo do presente trabalho foi avaliar a cobertura da cultura da soja na aplicação de fungicida em função de pontas de pulverização (ponta de jato cônico e duas pontas de jato plano anexado a um corpo de bico DUO) e três volumes de calda (100, 150 e 200 dm 3 ha -1 . Para a pulverização com bicos hidráulicos foi utilizado um pulverizador costal de pressão constante mantida por CO 2 comprimido com barra de 2 m. A análise da porcentagem de cobertura foi realizada por meio da utilização de papel hidrossensível, sendo que, esse foi colocado em três posições da planta o que representa, em altura, os terços superior, médio e inferior do dossel. Para todos os terços não houve interação entre os fatores avaliados, assim como também não houve diferença estatística entre as pontas de pulverização e entre os volumes de calda. Em relação aos volumes de aplicação o de 200 dm 3 ha -1 apresentou maior porcentagem de cobertura. Palavras-chave: Tecnologia de aplicação; jato plano; jato cônico; ferrugem asiática. ABSTRACTThe goal of this research was to evaluate two tips of spraying nozzles (hollow cone nozzle and two flat fan nozzle annexed to a nozzle body DUO) and three spray volumes (100, 150 and 200 dm 3 ha -1 ), whose application was for the control of the Asian soybean rust. An area of 288 m 2 was used, with a randomized blocks design in a factorial 2x3 with 4 repetitions, total of 24 experimental parcels of 12 m 2 . For the spraying with hydraulical nozzles a costal spray of constant pressure kept by CO 2 compressed with bar of 2 m was used. The analysis of the covering percentage was carried through by means of the use of hidro-sensible paper, that was placed in three position of the plant what it represents, in height, the third superior, average and inferior of the canopy. For both the third no interaction between the evaluated factors, was found and meither difference statistics between the spraying tips and the volumes. In absolute values the twin flat fan nozzle DUO presented minimum difference of covering in relation to the hollow cone nozzle, and for the spray volume of 200 dm 3 ha -1 presented greater covering percentage.

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Avaliação Do Depósito De Gotas Obtido Através Da Pulverização Eletrostática E Da Convencional Sobre a Cultura Do Algodoeiro

Cited by 5 publications

References 8 publications

Control of Dalbulus maidis in maize crop with electrostatic spraying

Control of Dalbulus maidis in maize crop with electrostatic spraying

Parameters of electrostatic spraying and its influence on the application efficiency

Cobertura Da Cultura Da Soja Pela Calda Fungicida Em Função De Pontas De Pulverização E Volumes De Aplicação

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