Priming, flushing, records transcript
Many sprayers are operating with autospray GPS. It's important to consider priming when using this technology. If you pull into the gate and start spraying with your autospray on and haven't allowed the spray unit to prime, when you come back around to the starting point, we don't want the sprayer to turn off and then be having an unapplied or an under-applied area of the paddock. A simple solution to this is don't turn the autospray on for the first lap.
This will allow you to come around, spray back over where you've started. If you use your foam marker to mark the first 100 metres out, that will ensure that's allowed the sprayer enough time to prime and you will not have a misapplication area. A simple trick to check how long it takes your sprayer to prime is to go back and monitor a gramoxone job that you may have done.
Measure how far from where you started the spray unit to where the application actually starts being effective. This will give you the priming distance. Resistance measurements should be taken from around the middle of the boom spray, avoiding the ends and tips of the boom spray. Also avoid perimeter areas and buffer zones where autospray may have switched on and off as the sprayer starts and finishes a run, as these are potential under-application areas.
Flushing of the spray unit is best carried out in the paddock that you've just sprayed. If you have 300 litres of fresh water on board the spray unit, this is best used in three, 100 litre lots, giving a more effective flush of the sprayer unit pump and lines. Start flushing where you started spraying in the paddock. This will ensure chemicals have dried on the plants. Flushing should be carried out with the sprayer in motion, rather than static.
A static flush next to a boundary fence can create off-target movement to the neighbouring paddock and have concentrated spray coming out of the spray lines. If your sprayer is fitted with proportional valves, when transferring the final 100 litres from the fresh tank, have the solenoids turned off. This will ensure the return to tank line is clean and the bottom of the solenoids have been effectively rinsed. Make a record your chemical use that meets the regulatory requirements in Victoria.
These need to include: the product's trade name; he date it was used; the application rate; the crop that was treated or the situation in which the chemical was applied; the extent of use, that is, the area of land sprayed; the specific location of the spraying; the wind speed and direction at the time of spraying the name and address of the person who did the spraying or if you're spraying on behalf of someone else, you also need to record the name and address of the person for whom the application was carried out.
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