Caracterização do perfil de deposição e do diâmetro de gotas e otimização do espaçamento entre bicos na barra de pulverização

Fernandes, Ana Paula; Parreira, Renata Souza; Ferreira, M. C.; Romani, Gustavo N.

doi:10.1590/s0100-69162007000400016

Cited by 33 publications

(23 citation statements)

References 6 publications

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“…For this model of nozzle, a rise in pressure resulted in an increase of 79.5% of the drift percentage for the 5.0 meters of distance from the spray boom. According to FERNANDES et al (2007), a rise in pressure reduces the medium volumetric diameter (MVD) of the sprayed droplets that directly increases the risk of drift. For the distances of 10.0 and 15.0 meters, this percentage was of 48.6 and 40.4% respectively, presenting significant difference between them under the pressure of 276 kPa.…”

Section: Resultsmentioning

confidence: 99%

Effect of working pressure at different spray nozzles on drift quantification in wind tunnel

et al. 2014

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Each year, there is an increase in pesticide consumption and in its importance of use in the large-scale agricultural production, being fundamental the knowledge of application technology to the activity success. The objective of the present study was to evaluate the influence of working pressure on the drift generated by different spray nozzles, assessed in wind tunnel. The treatments were composed of two spray nozzles AXI 110015 and AXI 11002 with pressure levels of 276 and 414 kPa. The spray solution was composed by water and NaCl at 10%. The applications were conducted at wind speed of 2.0 m s -1 , being the drift collected at 5.0; 10.0 and 15.0 m away from the spray boom and at heights of 0.2; 0.4; 0.6; 0.8 e 1.0 m from the tunnel floor. To both spray nozzles, the greatest drift was collected at the smallest distance to the spray-boom and at the lowest height. The AXI 11002 nozzle gave a smaller drift relative to the AXI 110015 nozzle for the two tested pressures and for all the collection points. Regardless of the nozzle, a rise in the working pressure increases the spray drift percentage at all distances in the wind tunnel. KEY-WORDS:Application technology, pesticides, environmental contamination. EFEITO DA PRESSÃO DE TRABALHO EM DIFERENTES PONTAS DE PULVERIZAÇÃO NA QUANTIFICAÇÃO DA DERIVA EM TÚNEL DE VENTO RESUMO:A cada ano, há um aumento no consumo e na importância do uso de agrotóxicos na produção agrícola em alta escala, sendo fundamental o conhecimento da tecnologia de aplicação para o sucesso da atividade. O objetivo deste trabalho foi avaliar a influência da pressão de trabalho sobre a deriva gerada por diferentes pontas de pulverização, avaliada em túnel de vento. Os tratamentos foram compostos por duas pontas de pulverização: AXI 110015 e AXI 11002, nas pressões de 276 e 414 kPa. A calda de pulverização foi composta por água e NaCl a 10%. As aplicações foram realizadas com velocidade de vento de 2,0 m s -1 , sendo a deriva coletada a 5,0; 10,0 e 15,0 m de distância da barra de pulverização e nas alturas de 0,2; 0,4; 0,6; 0,8 e 1,0 m em relação ao piso do túnel. Para as duas pontas de pulverização, a maior deriva coletada ocorreu na menor distância em relação à barra de pulverização e na menor altura em relação ao piso do túnel. O modelo de ponta AXI 11002 apresenta menor porcentagem de deriva coletada em relação ao modelo AXI 110015, para as duas pressões testadas e em todos os pontos de coleta. Independentemente da ponta, o aumento da pressão de trabalho aumenta a porcentagem de deriva em todas as distâncias de coleta realizadas no túnel de vento. PALAVRAS-CHAVE:Tecnologia de aplicação, agrotóxicos, contaminação ambiental.

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Section: Resultsmentioning

confidence: 99%

Effect of working pressure at different spray nozzles on drift quantification in wind tunnel

et al. 2014

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“…Um dos fatores mais importantes para obter uma aplicação eficiente é a escolha correta das pontas de pulverização Estas são responsáveis pela qualidade de aplicação, visto que interferirá na vazão, cobertura do alvo e uniformidade de distribuição da calda (Bauer & Raetano, 2004;Fernandes et al, 2007). Outra variável importante na aplicação é o volume de calda.…”

Section: Introductionunclassified

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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“…The diffraction degree that the light beam suffers is inversely proportional to the particle size (Fernandes et al, 2007). The data codification, according to the algorithm elaborated for the characterization of the droplets diameter per laser diffraction was processed and put in a table directly through the Mastersizers ® program, version 2.19.…”

Section: Tests In Laboratorymentioning

confidence: 99%

Application Volumes and Sizes of Droplets for the Application of Diquat Herbicide in the Control of Eichhornia crassipes

et al. 2016

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The objective of this study was to evaluate the efficiency of application and the efficacy of control of water hyacinth (Eichhornia crassipes) with the use of the diquat herbicide done with two application volumes associated to three droplets classes. Three experiments were conducted; in the first, the application efficiency was evaluated; in the second, the control efficiency and; in the third, the droplet spectrum. They were conducted in a completely randomized design with five, four and six replicates, respectively. The treatments were arranged in a 2 x 3 factorial design, with two application volumes (100 and 200 L ha-1) and three droplets classes (fine, extremely coarse and ultra-coarse) to the first and second experiment and the third comprised two diquat concentrations in spray solution (2 and 4 g i.a. L-1) and three droplets classes (fine, extremely coarse and ultra-coarse). The application efficiency was determined by the coverage by droplets, spray deposition and active ingredient of the herbicide (diquat). The efficacy was measured by the control and the percentage of plants with regrowth at 50 days after application. The spectrum of droplets produced per each nozzle model used to obtain the droplets classes were analyzed. According to the parameters analyzed, using the droplets classes extremely thick and ultra thick can provide greater certainty in the application of diquat in the aquatic environment associated with the deposition of the active and sufficient coverage to control Eichhornia crassipes with both application volumes

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Caracterização do perfil de deposição e do diâmetro de gotas e otimização do espaçamento entre bicos na barra de pulverização

Cited by 33 publications

References 6 publications

Effect of working pressure at different spray nozzles on drift quantification in wind tunnel

Effect of working pressure at different spray nozzles on drift quantification in wind tunnel

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

Application Volumes and Sizes of Droplets for the Application of Diquat Herbicide in the Control of Eichhornia crassipes

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