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John Nairn, as acting Regional Director - South Australian Region, Bureau of Meteorology, gave a
presentation on “A new heatwave warning service for Australia”, which is currently being evaluated.
Subject: “Inversions and Turbulence and their Relevance to Spraying of Agricultural Chemicals”
Speaker: Warwick Grace, of Grace Research.
When: 5.30pm, Monday 16 February 2015
Conference Room. Bureau of Meteorology, 25 College Road, Kent Town. SA
Contact: The Secretary
PO Box 421
Kent Town SA 5071.
Phone: 8366 2664
Nowadays there is an increasing amount of agricultural spraying conducted at night. Although there are
practical advantages to spraying at night compared to spraying during the day, at night there is often an
inversion present. The presence of an inversion can lead to some spray drifting off in unexpected directions
with the operator unaware of this. The adverse effects of the off-target spray drift then show up a few days
later in other crops several kilometres away.
Over the wheat fields of WA, Graeme Tepper and I have set up instruments to measure inversions, turbulence
and wind. We are analysing the measurements with the purpose of identifying rules for night time spraying.
Preliminary analyses and our ideas will be presented. This work is sponsored by the Grains Research &
Development Corp and the Dep of Agriculture & Food in WA.