# Predicting the off-site deposition of spray drift from horticultural spraying through porous barriers on soil and plant surfaces

Paper

Mercer, Geoff and Roberts, Tony. 2005. "Predicting the off-site deposition of spray drift from horticultural spraying through porous barriers on soil and plant surfaces." Wake, Graeme (ed.) MISG 2005: 22nd Mathematics-In-Industry Study Group. Auckland, New Zealand 24 - 28 Jan 2005 Auckland, New Zealand.
Paper/Presentation Title Predicting the off-site deposition of spray drift from horticultural spraying through porous barriers on soil and plant surfaces Paper Mercer, Geoff (Author) and Roberts, Tony (Author) Wake, Graeme Proceedings of the 22nd Mathematics-In-Industry Study Group (MISG 2005) 26 2005 Auckland, New Zealand 0473104237 http://www.maths-in-industry.org/miis/46/2/spray_rpt.pdf MISG 2005: 22nd Mathematics-In-Industry Study Group MISG 2005: 22nd Mathematics-In-Industry Study GroupEvent Date24 to end of 28 Jan 2005Event LocationAuckland, New Zealand Shelterbelts can be used to capture spray drift from crop spraying and reduce its spread to non crop areas. Critical factors in the efficiency of this capture are the ambient wind velocity, the structure of the shelterbelt and the spray drift droplet distribution. Here we present a model of the flow through and over a shelterbelt. It is found that the flow pattern is largely independent of the ambient wind strength. Settling and evaporation of the spray drift droplets are investigated and critical droplet diameters determined. It is found that droplets larger than 200 microns settle before reaching the shelterbelt and need not be included in the shelterbelt capture calculations. A model of the spray drift collection within the shelterbelt is analysed. Wind speeds between 1 and 5 m/s are considered which is the range that spray operations are usually performed over. Shelterbelts with optical porosities between 10% and 30% and constructed of fine particles such as pine needles are found to perform the best. shelterbelts; windbreaks; mathematical models; crop spray drift collection 401199. Environmental engineering not elsewhere classified 490102. Biological mathematics 300499. Crop and pasture production not elsewhere classified File reproduced in accordance with the copyright policy of the publisher/author. University of New South Wales Department of Mathematics and Computing

https://research.usq.edu.au/item/9x758/predicting-the-off-site-deposition-of-spray-drift-from-horticultural-spraying-through-porous-barriers-on-soil-and-plant-surfaces

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