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Best low drift nozzle for 32% mixed with herbicide?
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Posted 1/12/2021 15:27 (#8745472 - in reply to #8745290)
Subject: RE: Best low drift nozzle for 32% mixed with herbicide?

Good Stuff.

For Harness, make sure you are soaking it pretty good when you are mixing (if you are using wettable powder). I recall the label having good instructions for tank mix if you were adding to fert as well to ensure the mix isn't antagonizing when filling.

1. As far as nozzle size, to give yourself the best option for best speed range (from 7-9MPH), and 20-25 gallon/acre swing, you'd probably in the realm of using a 110-06 nozzle size.
That'd put you in the realm of ~25-40PSI for your 20 Gal work, and 40-60PSI for your 25 gal work without changing much for speeds at higher rate.

Probably a good fit, as you aren't going crazy fast. If it was going towards a 110-08 or larger size (if going faster), then you might want to sway away from some of the heavier drift reduction nozzles as they get too coarse too quickly with the larger sizes.

2. As far as spray quality/etc, label isn't great for Harness, but you'd be looking for around the Coarse-Very Coarse spray quality, just keeping consistent spray coverage. As long as it isn't too fine.

To give a pretty good idea of where you might find that sweet spot between drift and coverage, I attached two of our charts. You can get the jist of what sort of reduction of drift if you are using the spray quality to drift levels and that kind of stuff for comparison, between whatever nozzle brand you are settling down with. (So it is still helpful if you aren't using Wilger nozzles, which is cool too)

So, for a comparison between a Wilger SR110-06 and MR110-06 (two different stages of drift reduction in the same nozzle size) - attached pictures to the thread as well so you can see the Tip Wizard chart out of it.

SR110-06 would be your typical Coarse nozzle that gives primarily high level of coverage, at drift levels that might be acceptable for contact herbicides like Glufosinate/etc.

For your pressure ranges, you can get a pretty solid range of coarse-very coarse spray quality, but it'd be in the realm of like 7-12% driftable fines (or %<141µ in the chart) at those pressures. Might be a bit higher for your pre- work, especially if you have susceptible acres close by. Keep in mind the driftable fines % are based on ideal conditions, so if Wind is picking up to like the 12mph+, expect driftable fines to be doubling (more risk)

As far as coverage with an SR110-06, there is the column of %<600µ, which is pretty much the % of small droplets, so the higher the distribution of fine droplets, the better the coverage should be (as long as your drift isn't nullifying it). The SR is around the 87-93% coverage, which is excellent, but it comes at the higher level of drift that might not be acceptable to the application or label requirement. Typically for pre-emergent chem or pre-burn chem, you'd be wanting to maintain a %<600 of over 80% to give sufficient coverage to keep things applied consistently.

So, the SR110-06 might be in the realm of your entry level drift reduction nozzles, or a bit finer than some first stage air induction nozzles. (Or a bit coarser than something like a Hypro 3D which is a bit different)

The MR110-06 is still the same flow rate, so the pressures would be the same, but it is a fair bit coarser, which might play better with what you are spraying. On the drift side, you'd be in the realm of like 3-5% drift, which is ultimately very low. (There are lower drift nozzles out there, but don't go too crazy)
The Coverage side of things puts you in around the 70-80% small droplets, which is a good place to be. Given you are applying a pretty healthy carrier volume, you can tolerate nominally lower level of coverage, but you don't want to go too crazy for the further reduction in drift as it comes at a steep price.

For comparison, the MR110-06 would be that first stage air induction nozzle kind of design.

While there are coarser nozzles out there that will knock your driftable fines down a peg, it comes at a pretty steep cost, and you should be made aware of it.

So, when I was talking about the '% driftable fines' and '% of small droplets', they can tell a bit of how efficient you are being with your volume when you are looking for coverage. So, take the %<600µ and subtract the % driftable fines to get kind of an 'effective spray volume' %. The higher the percent (as long as drift is reasonable), the better you'd expect the nozzle to work for you.
Why I bring this is up is to give an idea of what the next coarser kind of nozzles might look like (e.g. DR110-06, ULD110-06, TTI110-06)

While the driftable fines for those nozzles are going to be like <1-3%, you'd be seeing the spray coverage factor being reduced in the realm of like 55-70% or even lower with the coarsest of those options. (e.g. For the Ultra-Coarse nozzles in that size, you'd be in the realm of like 40-55% of your spray being small droplets)

For a rough example, taking the three series/styles of nozzles as far as their effective spray volume @ 50PSI
SR110-06 or Coarse nozzles: 92% Coverage Factor - 10% driftable fines = '82% Effective Spray Volume'; BUT drift might be too high for your liking.
MR110-06 or VC nozzles: 78% Coverage Factor - 4% driftable fines = '74% Effective Spray Volume'; with a sufficient level of coverage with your water volumes
DR110-06 or XC nozzles: 68% Coverage Factor - 3% driftable fines = '65% Effective Spray Volume'; might be OK, but less efficient.
UR110-06 or UC nozzles: 48% Coverage Factor - 1.5% driftable fines = '46.5% Effective Spray Volume'; A hefty price to pay in coverage for that extra drift reduction, unless you really need it.

Might have been a bit more in detail than you need, but hope that gives you an idea of what kind of differences you could probably expect between different nozzles by what info you can get.

Let me know if you had any questions based on that,

(MR110-06@25GPA (full).jpg)

(SR110-06@25GPA (full).jpg)

Attachments MR110-06@25GPA (full).jpg (40KB - 3 downloads)
Attachments SR110-06@25GPA (full).jpg (40KB - 3 downloads)
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