Deposição da Calda de Pulverização Aplicada com Pontas de Jato Plano em Diferentes Partes da Planta de Soja (Glycine max) e Milho (Zea mays)

Silva, Bruno Monteiro da; Sichocki, D.; Caixeta, Leonardo Fideles; Dezordi, Luciel Rauni; Ruas, Renato Adriane Alves

doi:10.13083/1414-3984.v22n01a02

Cited by 10 publications

(19 citation statements)

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“…Reduction of row spacing increased grain yield by approximately 6.5% and 8.6% for the susceptible cultivar (SYN 1363 RR) and for the resistant cultivar (SYN 1365 RR), respectively, by observing the 0.17 m spacing between rows in relation to the other ones (Table 8 and Table 9). One of the main reasons for ineffective ASR control is associated with the target coverage deficiency by the application of fungicides, especially at the lower portion of the plant (Cunha et al, 2014;Silva et al, 2014;Cunha et al, 2016;Moura et al, 2017, Weber et al, 2017. The control efficacy becomes, therefore, compromised, as fungicides for ASR management, although systemic, are translocated to small distances from the deposition point (Reis et al, 2010).…”

Section: Resultsmentioning

confidence: 99%

“…From numerous strategies for dealing with ASR, the application of fungicides is a widely used one. In most cases, the uniformity in distribution of the product, provided by the terrestrial and aerial applications, along the soybean canopy, is low (Cunha et al, 2014, Silva et al, 2014. As this is one of the main causes of low efficiency in disease control, strategies that increase the deposition of spray droplets in this canopy layer are necessary (Cunha et al, 2011;Nascimento et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

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Chemical Control of Asian Soybean Rust as a Function of Cultivar, Row Spacing and Spray Bar Support Systems

Hoffmann¹,

Roehrig

Boller

et al. 2019

Eng. Agríc.

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Product deposition and foliar surface cover are highly impacting factors on the efficiency of foliar fungicides applied to soybean cultivars, due to their low mobility, with side effects on Asian soybean rust (ASR) control. Spray bar support systems, such as the air curtain (Vortex ® ) and the use of nozzles along the bar (Dropleg ® ), stand out as an alternative to obtain a better distribution of fungicide throughout the plant. In this study, two spray bar support systems (Vortex ® and Dropleg ® ) were, therefore, evaluated and compared with the conventional spraying method based on the biological efficacy in ASR control. In order to do this, two harvests, with three spacing between rows and two cultivars were employed. Vortex ® and Dropleg ® spray bar support mechanisms do not effectively contribute to the optimization of Asian soybean rust control or to the grain crop yield, regardless of cultivar and row spacing. Decreasing the row spacing did not influence the level of control of Asian soybean rust, as the highest grain yield was obtained with the smallest spacing. The cultivar with genetic resistance to Asian rust showed lower levels of this disease, thus, greater control against the use of fungicides.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Chemical Control of Asian Soybean Rust as a Function of Cultivar, Row Spacing and Spray Bar Support Systems

Hoffmann¹,

Roehrig

Boller

et al. 2019

Eng. Agríc.

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show abstract

“…This condition decreases coverage levels and droplet deposition from the upper to the lower crop strata (Prado et al, 2015;Da Silva et al, 2014;Zaidan et al, 2012).…”

Section: Introductionmentioning

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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“…O ajuste deste índice apresenta como limitação a variação de volume vegetativo apresentado pela lavoura de café, que se dá em função de diversos fatores, tais como: idade da planta, desfolha decorrente da colheita (SANTINATO et al, 2014), ataque de pragas e doenças (MATIELLO et al, 2010), realização de podas (FERNANDES et al, 2012), variações sazonais que ocorrem em função da disponibilidade hídrica e variação na temperatura (DaMATTA et al, 2007). Essas variações, principalmente ao longo das estações, resultam em alterações na densidade foliar (BERNI et al, 1999), tendo influencia direta na eficácia das pulverizações, sobre tudo, na penetração, distribuição e deposição da calda (SILVA et al, 2014).…”

Section: Introdução Geralunclassified

Determinação do índice de volume de pulverização para a cultura do café

Sousa

Ruas

Silva

et al. 2017

C.Sci.

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O ajuste do volume de calda de acordo como o volume de vegetação tem-se mostrado uma forma de tornar as aplicações de agrotóxicos mais eficientes. Porém, para adoção deste método para o cafeeiro ainda é necessário a determinação do Índice volumétrico. Assim, objetivou-se determinar do índice volumétrico de pulverização para a cultura do café (Coffea arabica .) Os tratamentos foram dispostos em blocos seguindo fatorial (5 x 5), sendo cinco volumes de calda (200; 300; 500; 600 e 800 L ha-1) e cinco volumes vegetativos (TRV), com quatro repetições. Realizou-se a avaliação de densidade foliar previamente às aplicações dos tratamentos em três estádios de desenvolvimento (enchimento, maturação e pós-colheita dos frutos). Analisou-se a deposição de calda (DEP), densidade de gotas (DEN), diâmetro mediano volumétrico (DMV) das gotas e amplitude relativa (SPAN) do espectro de gotas. Os volumes de calda aplicados foram convertidos em índice volumétrico (IV). Não houve interação ente TRV e volume de calda (p > 0,05) para as variáveis respostas DEP e DEN. Na avaliação realizada durante o estádio de maturação, a densidade foliar foi 29% superior à época de pós-colheita e a DEP máxima obtida foi de 0,74 µL cm-2. O DMV médio obtido foi de 217 µm e o SPAN de 1,1. O ajuste da curva de DEN de acordo com o IV permitiu estimar uma redução em até 47% do volume de calda aplicado. Concluiu-se que o ajuste do IV de acordo com as variações de densidades foliares permite reduzir o volume de calda aplicado em lavouras de café.

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Deposição da Calda de Pulverização Aplicada com Pontas de Jato Plano em Diferentes Partes da Planta de Soja (Glycine max) e Milho (Zea mays)

Cited by 10 publications

References 0 publications

Chemical Control of Asian Soybean Rust as a Function of Cultivar, Row Spacing and Spray Bar Support Systems

Chemical Control of Asian Soybean Rust as a Function of Cultivar, Row Spacing and Spray Bar Support Systems

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

Determinação do índice de volume de pulverização para a cultura do café

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