Droplet size classification of air induction flat fan nozzles

Czaczyk, Zbigniew; Kruger, Greg R.; Hewitt, Andrew

doi:10.2478/v10045-012-0068-6

Cited by 18 publications

(12 citation statements)

References 12 publications

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“…Wenneker & Zande (2008) afirmam que as gotas com indução de ar, devido ao seu tamanho, apresentam um caimento vertical mais rápido tendendo a se acumularem no solo próximo ao local de aplicação. Czaczyk et al (2012) afirmam que gotas grandes podem ressaltar, quebrar e escorregar das folhas ou outros alvos.…”

Section: Resultsunclassified

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Deposição de calda em folhas de cafeeiro e perdas para o solo com diferentes taxas de aplicação e pontas de pulverização

Silva

Cunha

Nomelini

2014

Rev. bras. eng. agríc. ambient.

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O cafeeiro apresenta diversos desafios para a tecnologia de aplicação dos produtos fitossanitários, principalmente no que se refere à penetração da calda no dossel da cultura e à redução da deriva. Objetivou-se analisar a deposição de calda pulverizada na folhagem do cafeeiro e a perda para o solo, proporcionada pela aplicação com diferentes taxas e pontas de pulverização. O experimento foi conduzido no esquema fatorial 2 x 2 e oito repetições, sendo os fatores pontas de pulverização (jato cônico vazio - ATR e jato cônico vazio com indução de ar - TVI) e taxas de aplicação de calda (200 e 500 L ha-1). Em todos os tratamentos as aplicações foram realizadas utilizando-se um pulverizador hidropneaumático e o marcador Azul Brilhante, o qual foi quantificado por espectrofotometria. Para avaliação de depósito foram coletadas folhas das metades superior e inferior das plantas e também lâminas de vidro já posicionadas junto à superfície do solo. O uso de pontas com indução de ar mostrou-se viável quanto à deposição de calda no cafeeiro, principalmente junto ao uso da maior taxa de aplicação. O emprego da menor taxa (200 L ha-1) mostrou-se viável junto ao uso da ponta de jato cônico vazio. A ponta com indução de ar proporcionou maiores perdas para o solo.

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Section: Resultsunclassified

“…Gotas finas podem aumentar a cobertura em pulverizações e com isto a eficácia dos produtos (Derksen et al, 2007). Gotas grossas são menos propensas à evaporação e carreamento pelo vento sendo, porém, mais sujeitas a não se fixarem no alvo e escorrerem para o solo (Cunha et al, 2006;Czaczyk et al, 2012).…”

Section: Introductionunclassified

Deposição de calda em folhas de cafeeiro e perdas para o solo com diferentes taxas de aplicação e pontas de pulverização

Silva

Cunha

Nomelini

2014

Rev. bras. eng. agríc. ambient.

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“…However, small droplets exposed to unfavorable climatic conditions, such as low relative humidity, high temperatures and wind speeds, are more likely to be evaporated and lost by drift (VILLALBA; HETZ, 2010). Czaczyk et al (2012) reported that thicker droplets can jump, break and slip through the leaves and reach other targets. However, areas that were treated with an application rate of 30 L ha -1 in the angle orientation of the spray nozzle at 135° of deflection generally produced better results of momentary efficiency of gas exchanges.…”

Section: Resultsmentioning

confidence: 99%

Physiological changes in sugarcane in function of air and ground application of fungicide for orange rust control

Alves¹,

Cunha²,

Lemes³

et al. 2018

Biosci. J.

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The application of fungicides in different operating conditions is a usual practice for maintaining the productive potential in sugarcane varieties considered susceptible to orange rust, however, the physiological effects provided by the different application methods are unknown. The objective of this study was to evaluate the photosynthetic responses (gas exchange and chlorophyll content) in the SP81-3250 sugarcane variety, in function of different operational conditions of the aerial and ground application of fungicide in the orange rust control. Two application of fungicides of the chemical groups Strobilurins and Triazoles were carried out in the experimental units in different treatments. In the aerial applications, two application rates (30 and 40 L ha -1 ) and three nozzle orientations (0º, 90º and 135º) and in the ground application was used 200 L ha -1 and flat fan spray nozzles with air induction (AI11004-VS). Gas exchange evaluations were performed with an IRGA and amount of chlorophyll a and b with a chlorophyll meter. Data were analyzed using Student's t-test for independent samples, at 0.05 significance. The aerial application provided better photosynthetic responses and chlorophyll a and b contents in leaf limb compared to ground application. Significant differences were detected in gas exchange and chlorophyll content between application rates and angulation of the spray nozzles in the boom. Fungicide applications provided increments of more than 19 t ha -1 compared to the control, depending on the spraying technique employed. Aerial application with 30 L ha -1 and 0° of deflection is a viable option to provide safer applications as a function of the larger droplet size.

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“…However, increasing the size of the spray droplets can sometimes circumvent this restriction. Thick droplets are less prone to evaporation and wind drift, but they are more likely not to stick to the target and drain into the soil (Czaczyk et al, 2012).…”

Section: Resultsmentioning

confidence: 99%

Time Available for Spraying and Mechanized Sowing in the Northeast of the State of Mato Grosso Do Sul and South of Goiás

et al. 2018

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The sizing of mechanized agricultural systems depends on the soil and climatic conditions, the crop and the work regime. The aim of this study was to determine the probabilities of time available during an agricultural year for mechanized spraying and sowing in the northeast region of the State of Mato Grosso do Sul and south of Goiás. The meteorological restrictions imposed as unfavorable hours were: ambient temperature above 32ºC, relative air humidity below 50%, wind velocity above 15 km h-1 and soil volumetric moisture above 39% (humidity equivalent to 90% of the available water capacity for the studied soil). The mathematical models were elaborated for eight years, based on the historical data of the automatic station of the National Institute of Meteorology installed in the region. It was possible to determine the time available for mechanized sowing and agricultural spraying operations. The available times for every ten days of the agricultural year for mechanized spraying and sowing in the study region were determined. The hourly water balance is used for the restrictive study of soil moisture in determining the time available for mechanized operations. A single selfpropelled sprayer (30 m bar) and a single seed drill (48 rows) are not sufficient to meet the operational rate in an area of 3,000 ha in the northeast of the state of Mato Grosso do Sul and south of Goiás.

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Droplet size classification of air induction flat fan nozzles

Cited by 18 publications

References 12 publications

Deposição de calda em folhas de cafeeiro e perdas para o solo com diferentes taxas de aplicação e pontas de pulverização

Deposição de calda em folhas de cafeeiro e perdas para o solo com diferentes taxas de aplicação e pontas de pulverização

Physiological changes in sugarcane in function of air and ground application of fungicide for orange rust control

Time Available for Spraying and Mechanized Sowing in the Northeast of the State of Mato Grosso Do Sul and South of Goiás

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