Northern Alberta | WilgerIndustries - 6/27/2022 10:36
Just as a rough idea.
At 12mph wind, drift of any tip is effectively going to DOUBLE.
At 20mph, I'd be reckoning that it'd be over tripling.
For a conventional flat fan -04 nozzle, you'd be talking like around 24% driftable fines at 40PSI in ideal conditions.
So, 12mph, that'd pretty well turn into 48% of your spray not going where you want it to go (evaporating, moving 5ft/50ft/500ft off target).
At 20mph, might be closer to 70% of your spray relying on the wind to bring it into the crop, so less consistency.
Conventional flat fans are probably horrible nozzles when it come to drift. I would never run them even in good conditions wind wise.
Again, I totally get real life conditions and living in a wind tunnel waiting for an ideal spray day, but at least with a bit of a reference to what you realistic drift might be, it might give some support as to which nozzle you'd be going towards to ensure you can spray confidently in the real life conditions that you have to deal with.
For a handful of the coops, they might be using a CRAZY ULTRA COARSE nozzle, but to get your drift down into the realm of <3%, you are usually taking a like 50-60% cut in coverage compared to a proper nozzle in proper wind speeds. So, not ideal for coverage or weed resistance if you have fields with some known chem resistance.
Lemme know if you have any questions,
-Lucas
In my experience, it doesn't work that way. Ultra coarse nozzles in high winds do not compromise coverage at all. The wind not only cause the spray pattern to "dance" a bit providing more coverage than if it was calm but the wind makes the WEEDS twist and dance and lay over exposing more leaf area to the spray providing g excellent coverage even with quite coarse spray patterns. In my experience, even low water volumes and coarse spray patterns provide excellent coverage and results even with contact products like Liberty. One of the advantages of being a custom applicator is that we learn from a variety of "farmer philosophies" on spraying doing things on request that we may otherwise scoff at. I have sprayed in conditions over the years at the customers request that I would have NEVER thought would work and found that the customer was right. Farmers that only spray for themselves have their self imposed restrictions that they never deviate from (which is a good thing) but then they never learn what might work outside those restrictions. |
spray tips to use when "breezy"
