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

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. In: MISG 2005: 22nd Mathematics-In-Industry Study Group, 24-28 Jan 2005, Auckland, New Zealand.

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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.

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Item Type: Conference or Workshop Item (Commonwealth Reporting Category E) (Paper)
Refereed: Yes
Item Status: Live Archive
Additional Information: Also available at Please note that the authorship of the published version differs slightly from the preprint version provided in USQ ePrints.
Faculty / Department / School: Historic - Faculty of Sciences - Department of Maths and Computing
Date Deposited: 11 Oct 2007 00:15
Last Modified: 02 Jul 2013 22:30
Uncontrolled Keywords: shelterbelts; windbreaks; mathematical models; crop spray drift collection
Fields of Research : 09 Engineering > 0907 Environmental Engineering > 090702 Environmental Engineering Modelling
01 Mathematical Sciences > 0102 Applied Mathematics > 010202 Biological Mathematics
07 Agricultural and Veterinary Sciences > 0799 Other Agricultural and Veterinary Sciences > 079902 Fertilisers and Agrochemicals (incl. Application)
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970101 Expanding Knowledge in the Mathematical Sciences

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