Droplet spectrum of a spray nozzle under different weather conditions

ABSTRACT The application of pesticides is always susceptible to losses through evaporation and drift of the spray droplets. With these losses, a smaller amount of pesticide reaches the target, possibly impairing the efficiency of phytosanitary control. Due to these concerns, the aim of this study wa...

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Bibliographic Details
Published in:Ciência agronômica 2018-07, Vol.49 (3), p.430-436
Main Authors: Maciel, Christiam Felipe Silva, Teixeira, Mauri Martins, Fernandes, Haroldo Carlos, Zolnier, Sérgio, Cecon, Paulo Roberto
Format: Article
Language:English
Subjects:
AGRONOMY
Droplet drift
Droplet evaporation
Hydraulic spraying
Laser particle-size analyser
Spraying losses
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Summary:ABSTRACT The application of pesticides is always susceptible to losses through evaporation and drift of the spray droplets. With these losses, a smaller amount of pesticide reaches the target, possibly impairing the efficiency of phytosanitary control. Due to these concerns, the aim of this study was to evaluate the interference of weather conditions in the droplet spectrum produced by hydraulic spraying. To carry out the work, it was necessary to build an experimental system. This consisted of a laser particle-size analyser, hydraulic nozzle (Jacto JSF 11002), stationary sprayer, gas heater, wind tunnel, climate chamber (with the aim of maintaining the internal psychrometry similar to that of the air exiting the wind tunnel), collector, and temperature and RH sensors. The weather conditions for the study included vapour pressure deficits (VPD) of 5, 9.4, 20, 30.6 and 35 hPa, and air velocities of 2, 3.6, 7.4, 11.2 and 12.8 km h-1. A Rotatable Central Composite Design was used, and the data related using Response Surface Methodology. The wind caused such a sharp drift in the fine droplets, that it greatly affected the behaviour of the entire droplet spectrum, as well as hiding the effect of the VPD. However, the conclusion is that drift and evaporation both act on the coarser droplets.
ISSN:1806-6690
DOI:10.5935/1806-6690.20180048