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

Silva, João E. R.; Cunha, João Paulo Arantes Rodrigues da; Nomelini, Quintiliano Siqueira Schroden

doi:10.1590/1807-1929/agriambi.v18n12p1302-1306

Cited by 19 publications

(26 citation statements)

References 18 publications

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“…WENNEKER & ZANDE (2008) state that the droplets with air induction, due to its size, showed a more rapid vertical trim tending to accumulate in the soil. SILVA et al (2014) observed a greater runoff with the use of nozzles with air induction (TVI) compared to ATR nozzles of the hollow cone type. In the ATR nozzles, with smaller droplets (VMD), these authors verified greater deposition on the leaves, probably due to the increase penetration and fixing on the coffee tree.…”

Section: Resultsmentioning

confidence: 99%

Spray deposition and chemical control of the coffee leaf-miner with different spray nozzles and auxiliary boom

Neto

Cunha

2016

Eng. Agríc.

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ABSTRACT:The coffee crop requires great spray ability to penetrate into the plant canopy during the application of pesticides. The aim of this study was to evaluate the spray deposition on leaves of coffee plants and the chemical control of the leaf miner provided by the application of different spray nozzles, with and without the use of an auxiliary boom. The deposition on the upper, middle and lower parts of the plants and the losses to the soil were evaluated using a tracer quantified by spectrophotometer. We also evaluated the chemical control of the leaf miner, counting the larvae, after the application of the insecticides cartap and fenpropathrin. The trial was carried out in a randomized block design, with four replications, in a factorial model (2×2+1): with and without the auxiliary boom, three spray nozzles (hollow cone -MAG 02, flat fan -AD 11002 and air induction hollow cone -TVI 8002) and a control. The use of the auxiliary boom increased the deposit ion in the lower part of the plants but decreased in the middle part, besides the increase in the runoff. The different nozzles do not provided differences in the deposition, showing the technical feasibility in the use of the hollow cone nozzles with coarse droplets and flat fan. All the chemical control decreased the leaf miner population, without differentiation.

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Section: Resultsmentioning

confidence: 99%

Spray deposition and chemical control of the coffee leaf-miner with different spray nozzles and auxiliary boom

Neto

Cunha

2016

Eng. Agríc.

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“…A introdução da tecnologia de indução de ar em pontas hidráulicas teve como um de seus objetivos elevar o tamanho das gotas, fato alcançado com sucesso. Durante os ensaios, as pontas analisadas apresentaram percentagem de gotas com diâmetro maior que 650 µm que foram considerados elevados para a aplicação de agrotóxicos, mesmo que sejam para a aplicação de produtos sistêmicos, pois uma grande parte do produto contido nestas gotas é perdido por escorrimento, corroborando com Silva et al (2014).…”

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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“…The use of air induction nozzles is a commonly used method as a drift reduction strategy in the application of crop protection products. Several studies using these nozzles types indicate reduction of drift percentage in relation to nozzles without air induction (Bueno et al, 2013;Silva et al, 2014a;Silva et al, 2016). The mechanis m at these nozzles follo ws the operating principle of a Venturi tube.…”

Section: Introductionmentioning

confidence: 99%

Spectrum and Velocity of Droplets of Spray Nozzles With and Without Air Induction

2018

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The aim of this study was to evaluate the spectrum and the velocity of droplets produced by nozzles with and without air induction, under different pressures and flow rates. The experiment was conducted in a completely randomized design with five replications, in a factorial 2 x 3 x 3 (two spray nozzles, three flow rates and three operating pressures). The spray nozzles with and without air induction of the Hypro manufacturer (GA and VP) were evaluated, with nominal flow rates of 0.76; 1.14 and 1.51 L min -1 and pressures of 200, 300 and 400 kPa. The spectrum and velocity of the droplets were determined directly, using a Visisize Portable P15 (Oxford Lasers, Imaging Division). The pressure increases further reduction of the VMD and the relative amplitude, and increases the droplet velocity. The droplets generated by the spray nozzles with air induction showed on average amplitude 1.54 times higher than the droplets generated by spray nozzles without air induction. The droplet velocity showed little variation between the nozzles with and without air induction with the same pressure and flow rate, however, spray nozzles with larger flow rates and pressures produced droplets with higher velocities.

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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

Cited by 19 publications

References 18 publications

Spray deposition and chemical control of the coffee leaf-miner with different spray nozzles and auxiliary boom

Spray deposition and chemical control of the coffee leaf-miner with different spray nozzles and auxiliary boom

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

Spectrum and Velocity of Droplets of Spray Nozzles With and Without Air Induction

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