Sprayed liquid loss due to evaporation
in different psychrometric conditions

Maciel, Christiam Felipe Silva; Teixeira, Mauri Martins; Zolnier, Sérgio; Fernándes, Haroldo Carlos; Santiago, Humberto

doi:10.5039/agraria.v12i2a5439

Cited by 5 publications

(7 citation statements)

References 13 publications

(18 reference statements)

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“…Cunha et al (2016) concluded that relative air humidity was the most limiting weather element to spraying in Uberlândia, in Minas Gerais State. The presence of a high vapor pressure deficit in the air, a condition associated with low relative air humidity, may decrease the size of the droplets sprayed, making them more susceptible to wind drag (Maciel et al, 2017). Fornasiero et al (2017) established that changes in droplet size and the use of spray adjuvants are tools that can help prevent spray drift.…”

Section: Resultsmentioning

confidence: 99%

“…Favorability of air temperature, wind speed greater than 10 km h -1 , wind speed less than 3 km h -1 , relative air humidity, and the four conditions simultaneously (General) for agricultural spraying at different times of the day in Rio Grande do Sul State, Brazil higher (Varejão-Silva, 2006). In contrast, spray drift is strongly increased under low relative air humidity and high vapor pressure deficit (Nuyttens et al, 2006;Maciel et al, 2017). When the vertical air temperature gradient is increased, a condition that represents atmospheric instability, the convective flow may lift small spray droplets, causing them to remain longer in suspension increasing their susceptibility to the effects of wind (Fritz, 2006), which even at lower speeds can potentialize the occurrence of spray drift.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Weather conditions favorable for agricultural spraying in Rio Grande do Sul State

Radons

Heldwein

Silva

et al. 2022

Rev. bras. eng. agríc. ambient.

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Knowledge of the periods when the meteorological conditions are favorable for agricultural spraying is important in agricultural planning, particularly in fleet dimensioning. This study aimed to determine, on a temporal scale, favorable weather conditions for agricultural spraying in Rio Grande do Sul State, Brazil. In addition, the times and months of the year that have the most and least suitable conditions for agricultural spraying were investigated, as well as the meteorological conditions that are frequently limiting and their relationships with the geographic coordinates and altitude of the location. Hourly data from automatic weather stations in 12 locations were collected, totaling 56,500 days and 1,356,009 hourly observations. Wind speeds greater than 3 km h-1 and less than 10 km h-1, air temperatures up to 30 °C, and relative air humidity above 55% were considered favorable. The data were released after descriptive analysis considering the registered frequency and mean. Altitude showed a moderate negative correlation with wind speed favorability. Air temperature was the meteorological element with the greatest favorability for agricultural spraying in the Rio Grande do Sul State, whereas wind speed was the most limiting meteorological element. There were no differences in favorability between the months of the year. The most favorable times were from 6:00 p.m. to 11:00 a.m. and the most unfavorable from 12:00 p.m. to 5:00 p.m. Considering the condition in which air temperature, wind speed, and relative air humidity were adequate for agricultural spraying simultaneously in the Rio Grande do Sul State, 43.2% of the periods were favorable.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Weather conditions favorable for agricultural spraying in Rio Grande do Sul State

Radons

Heldwein

Silva

et al. 2022

Rev. bras. eng. agríc. ambient.

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“…Outras pesquisas também têm evidenciado a influência da umidade relativa do ar na degradação dos princípios ativos, na deriva e na deposição dos defensivos agrícolas sobre o alvo. As menores taxas de umidade relativa do ar têm se mostrado mais propensas ao aumento da deriva e consequente redução da deposição sobre o alvo (MACIEL et al, 2017;MATTEI et al, 2019). Destaca-se, que o aumento da deriva de defensivos agrícolas pode influenciar na exposição dos trabalhadores aos agentes químicos, sendo também importante, portanto, o controle dos parâmetros meteorológicos.…”

Section: Cleonice Campos Teixeiraunclassified

Anais do XXIII Congresso Nacional de Engenharia de Segurança no Trabalho - CONEST

Barreto¹

2021

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A Associação Nacional de Engenharia de Segurança do Trabalho (ANEST) em conjunto com a Associação dos Engenheiros de Segurança do Trabalho de Londrina - PR (ASENGEST), realizou nos dias 24, 25 e 26 de novembro de 2021, o “23º CONEST – Congresso Nacional de Engenharia de Segurança do Trabalho”. Evento Técnico-científico destinado a atualização e troca de experiências, abordando como tema central: DESAFIOS PROFISSIONAIS NO MUNDO EM TRANSFORMAÇÃO, com a participação de renomados palestrantes nacionais e internacionais. Os diversos temas selecionados foram abordados em conferências, painéis e mini- cursos, utilizando-se de protocolos restritos e medidas preventivas rigorosas de saúde e segurança, tendo em vista o estado pandêmico em COVID-19 que o mundo se encontra.

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“…Spray drift is a complex process that is affected by various factors, including wind speed and direction (Kruger & Antuniassi, 2019;Wang et al, 2020), air temperature (Bish et al, 2019), relative air humidity (Maciel et al, 2017), physicochemical properties of the spray solution (Liu et al, 2021), the droplet spectrum (Vieira et al, 2018), and the development stage and sensitivity of the crop (Holterman et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Use of the test bench for spray drift assessment under subtropical climate conditions

Precipito

Ferreira

Paduan

et al. 2023

Rev. bras. eng. agríc. ambient.

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As an alternative to the International Organization for Standardization (ISO) method 22866, a method for the field measurement of spray drift was developed in the Department of Agricultural, Forestry and Environmental Economics and Engineering of the University of Turin, Italy. This new method, termed “test bench,” can be applied for wind conditions beyond those covered in ISO 22866. The aim of this study was to quantify the drift potential of three nozzles at two working pressures and two sprayer boom heights using the test bench method, under subtropical climate conditions. The experiment was conducted at Bandeirantes, Paraná State, Brazil, from 2018 to 2019 in a completely randomized design with 12 treatments, wherein three nozzles were used at the minimum and maximum working pressures, and two boom heights were tested, with four replicates for each combination. The following nozzles were used: XR11002 (100 and 400 kPa), AIXR11002 (100 and 600 kPa), and ATR 2.0 (400 and 2000 kPa), operating at boom heights of 0.50 and 1.00 m. The test bench method allows for drift assessment under subtropical climate conditions, and the results revealed that changes in meteorological conditions, nozzles, and pressure are key factors affecting the drift potential of boom sprayers. Relative air humidity and working pressure were the most important determining factors of the drift potential of the nozzles, whereas boom height had no effect on drift potential.

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Sprayed liquid loss due to evaporation in different psychrometric conditions

Cited by 5 publications

References 13 publications

Weather conditions favorable for agricultural spraying in Rio Grande do Sul State

Weather conditions favorable for agricultural spraying in Rio Grande do Sul State

Anais do XXIII Congresso Nacional de Engenharia de Segurança no Trabalho - CONEST

Use of the test bench for spray drift assessment under subtropical climate conditions

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