Tecnologias de aplicação de agrotóxicos

Baesso, Murilo Mesquita; Teixeira, Mauri Martins; Ruas, Renato Adriane Alves; Baesso, Raquel Couto Evangelista

doi:10.1590/0034-737x201461000003

Cited by 22 publications

(22 citation statements)

References 2 publications

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“…According to Baesso et al (2014), spray droplets can be divided by size: thin (< 200 μm), medium (200 and 400 μm) and thick (> 400 μm). The knapsack sprayer with electrostatic assistance produces thin droplets according to Gitirana Neto, Cunha, Marques, Lasmar, and Borges (2005), which better covers the target and provides greater penetration of the plant canopy (Baesso et al, 2014). Therefore, the droplet size produced by this equipment in the present study indicate a greater efficiency in depositing the spray mixture on the target.…”

Section: Resultsmentioning

confidence: 99%

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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Section: Resultsmentioning

confidence: 99%

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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“…Regarding the control of diseases, the target is small and in high number, requiring small droplets to obtain high spray coverage. Regarding the control of insects, large droplets must be used because of the greater mobility and lower number of targets (Baesso et al, 2014). ATR-1.0 nozzles generated a greater percentage of target coverage compared to TVI-800075 nozzles.…”

Section: Resultsmentioning

confidence: 99%

“…Some parameters are used to analyze the droplet size spectrum of sprays, such as the volume median diameter (VMD) and the coefficient of homogeneity (CH). According to Baesso et al (2014), the CH is defined as the ratio between VMD and number median diameter (NMD), which express numerically the droplet uniformity.…”

Section: Introductionmentioning

confidence: 99%

Spray volume distribution pattern and droplet size spectrum from ceramic nozzles

Massola

Holtz

Martins

et al. 2018

Rev. bras. eng. agríc. ambient.

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Droplet size spectrum and uniformity of spray volume distribution are important parameters for selecting spray nozzles. The objective of this study was to evaluate the average spray volume distribution and droplet size spectrum from ceramic nozzles. The spray volume distribution pattern was evaluated on a test table for hydraulic spray nozzles using spray heights of 0.4, 0.5, 0.6, 0.7, and 0.8 m, and working pressures of 500, 600, and 700 kPa. Computer simulations were used to analyze the spray volume distribution using arrangements of bar heights, working pressures, and spacing between spray nozzles in a bar of 12 m. The droplet size spectrum from the spray nozzles was evaluated using a randomized complete experimental design in a 2 × 3 split-plot arrangement consisting of two types of nozzles (ATR-1.0, and TVI-800075) and three working pressures (500, 600, and 700 kPa), with four replications. The uniformity of spray volume distribution was improved when using ATR-1.0 spray nozzles spaced 0.4 or 0.6 m apart, regardless of the working pressure. Regarding the droplet size spectrum, the volume median diameter decreased with increasing the working pressure for both types of nozzles, reaching 210 μm (ATR-1.0) and 483 μm (TVI-800075). Contrastingly, the percentage of droplets with diameter smaller than 100 μm increased with increasing working pressure; the target coverage presented the same trend, with 8.4% of coverage when using ATR nozzles with working pressure of 700 kPa.

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“…Os diferentes leques testados para uma determinada vazão nominal apresentaram comportamentos semelhantes e pouca variação nos parâmetros da pulverização. De acordo com Baesso et al (2014), gotas menores possuem maior capacidade de penetração no dossel da cultura, neste sentido, esperava-se que o leque de menor angulação apresentasse gotas de menores diâmetros, uma vez que este jorro tem a finalidade de produzir gotas para penetração no dossel da planta. Da mesma forma, esperava-se que o jorro de 70º, inclinado para trás do sentido de deslocamento da máquina, apresentasse gotas relativamente maiores comparados ao leque de 30º, pois este jorro tem por objetivo produzir gotas para maximizar a cobertura na parte superior da planta, entretanto, tais fatos não foram evidenciados.…”

Section: -218punclassified

Espectro Das Gotas Produzidas Por Pontas De Jato Plano Duplo Defasado Com Indução De Ar

Sasaki¹,

Teixeira²,

Maciel³

et al. 2016

Reveng

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Os fabricantes de pontas de pulverização constantemente disponibilizam novos modelos no mercado na tentativa de aumentar a eficiência das aplicações, entretanto muitas vezes seu comportamento é desconhecido em relação ao espectro das gotas produzidas. Sendo assim, este trabalho foi conduzido com o objetivo de avaliar o espectro de gotas proporcionado pelas pontas AI3070-015VP e AI3070-02VP. Estas apresentam dois jorros de pulverização defasados em relação à vertical (30 e 70°), ambos com indução de ar. Na análise do espectro, utilizou-se um analisador de partículas a laser (Spraytec, Malvern Instruments Co.) dotado de lente focal de 750 mm. Construiu-se um sistema para analisar individualmente os jorros produzidos pelas pontas. Realizaram-se as análises dos parâmetros técnicos da pulverização (DV0,1, DV0,5, DV0,9, Índice Span, %V < 100 μm e %V > 650 μm) empregando-se quatro pressões de trabalho (200, 300, 400 e 500 kPa). O experimento foi conduzido em delineamento inteiramente ao acaso, em esquema fatorial (2 x 2 x 4), sendo dois modelos de pontas hidráulicas dois leques e quatro pressões de trabalho. Para a ponta AI3070-015VP o jorro produzido com ângulo de 70° produziu gotas com maior diâmetro da mediana volumétrica (DMV) em relação ao de 30° ao passo que, para a ponta AI3070-02VP, o comportamento foi o inverso. As pontas testadas apresentaram gotas com baixo potencial de deriva, com %V

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Tecnologias de aplicação de agrotóxicos

Cited by 22 publications

References 2 publications

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

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

Spray volume distribution pattern and droplet size spectrum from ceramic nozzles

Espectro Das Gotas Produzidas Por Pontas De Jato Plano Duplo Defasado Com Indução De Ar

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