Pontas de pulverização e horários de aplicação no controle químico de ferrugem asiática da soja

Nascimento, Jackeline Matos do; Gavassoni, Walber Luiz; Souza, Cristiano Márcio Alves de; Bacchi, Lilian Maria Arruda; Serra, Ademar Pereira; Zaccaron, Márcio Leizer

doi:10.5433/1679-0359.2013v34n5p2037

Cited by 9 publications

(8 citation statements)

References 5 publications

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“…Similarly, Nascimento et al (2013) also did not obtain significant difference between different spray nozzles in the production of grains between the plots treated with fungicide.…”

Section: Resultsmentioning

confidence: 75%

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Spray Nozzles Performance in Fungicides Applications for Asian Soybean Rust Control

Durão

Boller

2017

Eng. Agríc.

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ABSTRACT:The performance of fungicides in controlling Asian soybean rust depends, in part, the spray quality of these products. The market of components to spray offers new types of nozzles which generate droplets with different characteristics. This study aimed to verify whether applications of fungicides with different spray nozzles interfere in soybean rust control. The experiment was conducted in the 2013/2014 harvest. The experimental design was a randomized block with three replications, and compared ten spray nozzles and a control without fungicide application. The applications were made with a backpack sprayer pressurized with CO2, set to apply a spray volume of 150 L ha -1 . For the determination of severity four plants per plot were sampled, quantifying in each leaflet the number of uredinia cm -2 , which permitted to integrate the area under the disease progress curve (AUDPC). We concluded that HYPRO GUARDIAN ® 120015 Single pre orifice flat spray nozzle, that generates medium size of droplets, provided the lowest AUDPC of soybean rust, as well as the use of fungicide reflected in grain yield, which was on average 288% higher than that obtained by the control without fungicide application.

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“…Similarly, Nascimento et al (2013) also did not obtain significant difference between different spray nozzles in the production of grains between the plots treated with fungicide.…”

Section: Resultsmentioning

confidence: 75%

“…Thus, in order to control soybean rust, it is essential that the spray nozzle is capable of providing homogeneous droplet coverage, allowing the pulverized product to reach the lower third of the canopy of the crop (Nascimento et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Spray Nozzles Performance in Fungicides Applications for Asian Soybean Rust Control

Durão

Boller

2017

Eng. Agríc.

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“…Alvarenga et al (2014) also observed this relationship using a hydro-pneumatic system. Nascimento et al (2013) evaluated different application times for the soybean crop and observed that, depending on the hydraulic nozzle used, the density of the droplets deposited on the target can decrease, which shows the effect of droplet evaporation along its trajectory. Yu et al (2009), under laboratory conditions, with droplets deposited on the target, observed shorter evaporation time with the reduction in relative air humidity, confirming the phenomenon of evaporation with the psychrometric changes in the air, which corroborates the results in the present study.…”

Section: Resultsmentioning

confidence: 99%

Droplets spectrum of air-assisted boom sprayers under different environmental and operational conditions

Sasaki

Teixeira

Fernándes

et al. 2016

Rev. bras. eng. agríc. ambient.

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A B S T R A C TDuring pesticide spraying, the psychrometric conditions of the air may cause evaporation of the droplets along their trajectory from the nozzle to the target. Thus, this study aimed to evaluate the effect of air psychrometric conditions and operating pressure on the droplet spectrum of air-assisted boom sprayers. The test was performed using a prototype equipped with an axial fan, a flow homogenizer, temperature and relative air humidity sensors, a spray nozzle and a gas-heating system to warm up the airflow. With the assembled system and the aid of a particle analyser, the JSF 11002 spray nozzle was evaluated with respect to droplet spectrum in four air psychrometric conditions (7, 14, 21 and 28 hPa) and at four operating pressures (200, 300, 400 and 500 kPa). At the end, evaporation losses were observed during the sprayings. For a given operating pressure and for each increment of 1 hPa in vapor pressure deficit, there was a diameter reduction of approximately 0.0759, 0.518 and 1.514 µm for the parameters DV 0.1 , DV 0.5 and DV 0.9 , respectively. The diameter of the droplets decreased as the operating pressure increased.Espectro de gotas de pulverizadores hidráulicos assistidos a ar sob diferentes condições ambientais e operacionais R E S U M O Durante a aplicação de agrotóxicos as condições psicrométricas do ar podem acarretar a evaporação das gotas no seu trajeto entre a ponta e o alvo. Neste sentido objetivou-se, com este trabalho, avaliar o efeito das condições psicrométricas do ar e a pressão de trabalho no espectro de gotas da pulverização hidráulica com assistência de ar na barra. O ensaio foi realizado empregando-se um protótipo dotado de um ventilador axial, homogeneizador de fluxo, sensores conjugados de temperatura e umidade relativa, ponta hidráulica e sistema de aquecimento do ar a gás. Com o sistema montado e com o auxílio de um analisador de partículas, avaliou-se a ponta hidráulica JSF 110-02 quanto ao espectro de gotas em quatro diferentes condições psicrométricas do ar (7, 14, 21 e 28 hPa) e em quatro pressões de trabalho (200; 300; 400 e 500 kPa). Ao final, observaram-se perdas por evaporação durante as pulverizações. Para a pressão de trabalho a cada incremento de 1 hPa no valor do déficit de pressão, ocorreu redução do diâmetro das gotas na ordem de 0,0759; 0,518 e 1,514 µm para os parâmetros de DV 0,1 , DV 0,5 e DV 0,9 , respectivamente. O diâmetro das gotas reduziu com a elevação da pressão de trabalho.

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“…At 6:00 pm, spraying provided a lower deposition in the medium stratum when comparing coarse to fine droplets; yet in the lower portion of plants, deposition was lower with coarse droplets. Nascimento et al (2013) tested several nozzles and two periods for the control of Asian soybean rust and found higher values of coverage and deposition in the upper portion of plants, but these variations did not affect crop productivity.…”

Section: Resultsmentioning

confidence: 99%

Spraying Quality of Crop Protection Products Using Two Droplet Spectra in Three Periods of the Day

et al. 2017

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Spraying of crop protection products can be affected by weather conditions and spray nozzles, altering deposition patterns and coverage of the target surface. The objective of this research was to analyze the quality of sprayings performed in three periods of the day (9:00 am, 2:00 pm, and 6:00 pm), using two different droplet sizes (fine and coarse) in soybeans. Coverage and deposition were evaluated in the upper, middle, and lower portion of soybean canopy. Spraying the products at 2:00 pm increased leaf coverage in the medium portion but also increased losses to the soil. Spray nozzles with fine droplet sizes provided greater coverage and deposition in the medium and upper portion of the crop for the sprayings performed in the morning. If compared to coarse droplets, fine droplets increased leaf coverage and had no interference with the losses to the soil.

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Pontas de pulverização e horários de aplicação no controle químico de ferrugem asiática da soja

Cited by 9 publications

References 5 publications

Spray Nozzles Performance in Fungicides Applications for Asian Soybean Rust Control

Spray Nozzles Performance in Fungicides Applications for Asian Soybean Rust Control

Droplets spectrum of air-assisted boom sprayers under different environmental and operational conditions

Spraying Quality of Crop Protection Products Using Two Droplet Spectra in Three Periods of the Day

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