The Effect of Boom Section and Nozzle Configuration on the Risk of Spray Drift

Murphy, S.; Miller, P. C. H.; Parkin, C.S.

doi:10.1006/jaer.1999.0491

Cited by 49 publications

(33 citation statements)

References 6 publications

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“…HC D4-45 nozzles have fine spray quality for British Crop Protection Council (BCPC). Murphy et al (2000) showed that drift decreased as sprays changed in quality from fine to coarse using BCPC scheme as expected. Liu et al (2006) obtained that hollow cone nozzle showed the highest potential drift on the boom sprayer compared with a flat fan nozzle, a low drift nozzle and an air inclusion nozzle.…”

Section: Resultssupporting

confidence: 73%

“…Even when a coarse spray, > 300 µm, is applied with most standard hydraulic nozzles, there will be a proportion of the spray volume emitted as small droplets which can drift (Matthews, 2000). Some researchers (Duvnjak and Miller, 1998;Holterman et al, 1997;Jones et al, 2002;Matthews, 2004;Murphy et al, 2000;Wenneker et al, 2005) found that coarse droplets produce less drift than fine droplets in low drift (LD) nozzles. According to EPPO (2003), the amount of drifting pesticide deposits as fall-out in the short range or transported through the air to greater distances from the treated area are determined by prevailing weather conditions.…”

Section: Introductionmentioning

confidence: 99%

“…To compensate for such disadvantages, computer and mathematical models are developed and used by some researchers (Gil and Sinfort, 2005;Goering et al, 1972;Holterman et al, 1997;Smith et al, 2000;Thompson and Ley, 1983;Uçar, 2000). Such models have been developed to predict spray droplet trajectories both close to nozzles on a boom sprayer and in the drifting spray plume further downwind of the application site (Murphy et al, 2000). The advantages of verified field drift models are that drift deposit predictions for a variety of application conditions can be compared and estimations can quickly be obtained (Smith et al, 2000).…”

Section: Introductionmentioning

confidence: 99%

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Comparison of field and model percentage drift using different types of hydraulic nozzles in pesticide applications

Yarpuz-Bozdogan

Bozdoğan

2009

Int. J. Environ. Sci. Technol.

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ABSTRACT:In pesticide applications, small droplets are desired for better coverage and uniform distribution. Yet, small droplets have a problem: Drift, the movement of droplets off-target. Low drift nozzle produces fewer drift-prone droplets, < 100 µm, compared to standard hydraulic nozzles. In pesticide applications, standard hydraulic nozzles, hollow cone and flat fan nozzles are generally used by farmers. These nozzles have broad droplet spectrum and high proportion drift-prone droplets. Sample of drifted droplets and measurements in field conditions are expensive and can be time-consuming. However, models can be applied to predict drift without field measurement. In this study, model and field measurement of percentage pesticide drift were compared using different hydraulic nozzles, D4-45, F 11006 and low drift 11003 by gas chromatography equipped with a nitrogen-phosphorus detector. In the result of this study, for all nozzles, values up to 2 m and 3 m showed that there were statistically different according to German model and Dutch model, respectively. In the result of this study, percentage drift at 5 m compared to 1 m distance decreased approximately 15 folds in low drift 11003, 12 in F 11006 and 10 folds in hollow cone D4-45 nozzles in actual application and 5 folds in German and 9 folds in Dutch models.

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Section: Resultssupporting

confidence: 73%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Comparison of field and model percentage drift using different types of hydraulic nozzles in pesticide applications

Yarpuz-Bozdogan

Bozdoğan

2009

Int. J. Environ. Sci. Technol.

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“…De acordo com as condições ambientais, é preciso conhecer o espectro das gotas pulverizadas, de forma a adequar o seu tamanho, garantindo, ao mesmo tempo, eficácia biológica e segurança ambiental. Vários pesquisadores consideram que gotas menores que 100 µm são facilmente carregadas pelo vento, sofrendo mais intensamente a ação dos fenômenos climáticos (Sumner, 1997;Murphy et al, 2000;Wolf, 2000).…”

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Avaliação de estratégias para redução da deriva de agrotóxicos em pulverizações hidráulicas

et al. 2003

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RESUMO -A deriva nas aplicações de agrotóxicos é considerada um dos maiores problemas da agricultura. Entre os fatores que a influenciam, o tamanho das gotas pulverizadas tem-se mostrado primordial. Dessa forma, o presente trabalho teve como objetivo a avaliação dos efeitos da adição de óleo vegetal emulsionável à calda de pulverização e do uso de pontas antideriva sobre o espectro de gotas e sobre o potencial de deriva de bicos de pulverização hidráulicos de jato plano. Em ambiente controlado, avaliou-se a população de gotas, por meio de um analisador de gotas por difração de raio laser, em tempo real, pulverizadas utilizandose bicos standard, com e sem a adição de adjuvante, e bicos antideriva, na faixa de pressão de 200 a 400 kPa. Como complementação, avaliou-se também a deriva em campo, utilizando-se alvos artificiais fora da área de aplicação, procedendo-se à contagem de gotas em diferentes distâncias. Observou-se que a adição de óleo vegetal à calda de pulverização e o uso de bicos de pulverização antideriva, dotados de pré-orifício, alteraram o espectro de gotas pulverizadas, aumentando o diâmetro das gotas e diminuindo a percentagem de gotas propensas à ação dos ventos, constituindo-se, portanto, em fator auxiliar para redução da deriva.Palavras-chave: tecnologia de aplicação, bicos de pulverização, adjuvantes, gotas. ABSTRACT -Pesticide spray drift is a major problem in agriculture today. Among the factors influencing drift, droplet size is of paramount importance. Thus, this work aimed to evaluate the effects of adding emulsifying vegetable oil to the pesticide emulsion and using low drift nozzles on droplet spectrum formation and, consequently, on the drift potential of fan spray nozzles.Droplet distribution was measured under controlled atmosphere, using a real time laser particle size analyzer. The droplets were generated with standard nozzles, with and without the addition of adjuvants, and with low drift nozzles, with the operating pressure ranging from 200 to 400 kPa. Also, drift was evaluated in the field, using artificial targets placed outside the application area, where droplet counting was accomplished. The results showed that both the addition of vegetable oil to the pesticide emulsion and the use of low drift nozzles altered droplet size spectra, increasing the diameter of the drops and reducing the percentage of drops subject to wind action being, thus, effective factors in drift reduction.

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“…According to Murphy et al (2000), pesticide drift is characterized by path deviation of the liquid particles of the application, being influenced by, among other things, wind speed, boom height, displacement speed of the applicator equipment, and the size of the droplets. This is considered one of the greatest problems of modern agriculture.…”

Section: Introductionmentioning

confidence: 99%

Pesticide application windows in the region of Uberlândia-MG, Brazil

Cunha¹,

Pereira²,

Barbosa³

et al. 2016

Biosci. J.

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ABSTRACT:The success of the pesticide application is subject to meteorological conditions. The objective of this work was to determine the application windows suitable for carrying out the application of pesticides, using as parameters the analysis of historical data (2009)(2010)(2011)(2012)(2013)(2014) of air temperature, relative air humidity, wind speed, and rainfall of Uberlândia-MG. With an electronic spreadsheet, and using the ideal meteorological conditions for applying pesticides (an air temperature above 30°C, relative air humidity above 55%, wind speed between 3 and 12 km h -1 , and rainfall data lower than 0.2 mm h -1 ) as a parameter, the data were crossed with the aim to determine the times of day that weather conditions were ideal to obtain better efficiency in the application. According to the results, the relative air humidity was the main restricting criterion for the application windows, which are concentrated, on average, between 18:00 and 12:00 in the summer, and between 24:00 and 9:00 in the winter. The number of viable hours for a good application varied from 35 in the first fortnight of September to 198 in the second fortnight of March, demonstrating the great variability among the application windows throughout the year, which makes the generic recommendations of spraying time inadequate if the month of the year is not taken into consideration.

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The Effect of Boom Section and Nozzle Configuration on the Risk of Spray Drift

Cited by 49 publications

References 6 publications

Comparison of field and model percentage drift using different types of hydraulic nozzles in pesticide applications

Comparison of field and model percentage drift using different types of hydraulic nozzles in pesticide applications

Avaliação de estratégias para redução da deriva de agrotóxicos em pulverizações hidráulicas

Pesticide application windows in the region of Uberlândia-MG, Brazil

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