You are confusing handheld spot sprying solutions with a field rate.
Do _not_ mix up the stuff you have been told for 30 acres!!!! That fella is not right.
You want to spray a pint, maybe a quart, of 4 lb (about 40%) generic glyphosate per acre.
You want to apply about 10-15 gallond of liquid per acre. Glyphosate actally works better with less water per acre, 10 gallons, than other types of spray, which often work better at 20 gallons per acre.
All this will depend upon the sprayer you get - more pressure means smaller droplets of water - which is often good for other sprays, but bad for glyphosate - you want medium or large droplets. So 20 lbs of pressure should be enough.
Different tips have different rates, so you gotta test your sprayer & see how much it sprays out. You can adjust slighlty by changing your driving gear - speed.
I have a little 110 gallon 3pt sprayer, it's set up to cover 8-9 acres. I have a 300 gallon sprayer, that one is set up to cover about 24 acres. If you check the math, they are both set up about the same.
So, I'd put 300 gallons of water in the sprayer, and 25 lbs of AMS (you ARE using this or a liquid equivilant aren't you???? It's a special nitrogen product that helps soften the water as well as help the glyphosate work better on the plant, it's needed more in harder water, important to add).
Then I'd add 2 or 3 2.5 gallong jugs of glyphosate, and let it all aggitate for a few minutes.
Then I'd spray that on 24 acres or so.
There is NO WAY you should be appying the amount of water or glyphosate your buddy at the store is saying. He's got some lawn-sprayer rate that is not apporpriate for your broadcast uses. Don't do that!
You need to start with the sprayer you get, and see how much spray it applies per acre. Spray some water out & figure it out. If it doesn't spray around 10-15 gallons of water per acre, then adjust your speed, or the pressure, or change the tips to a smaller or larger tip so you get in that 10-15 gallon oer acre range.
And you want to apply up to a quart per acre it really fry the weeds you are dealing with. And you want to add some AMS before you put the glyphosate in the tank - it keeps the glyphosate from binding up with hard water, as well as flushing the weeds a tad.
Some gemneric glyphosates - most really - have a sticky already in them; a few do not. If you get one without then you need to add some type of oil or soap which either helps open up the weed leaves, ro helps the spray stick to the weed for longer so it has time to soak in. Glyphosate typically likes the soap type moreso....
There is no way you should be applying 43 gallons of spray per acre. That is very wrong with glyphosate. Also I'd think 7.5 gallons of glyphosate would be plenty, you'd do ok with 5 gallons and some AMS in most conditions.
No wonder farmers are looked down upon for using GMO & modern technologies, when this bad a misinformation is being spread around by a fella that should know better! He's going about this all wrong. For applying to 30 acres, you find out what your sprayer does, and then do the math from that side - a pint or 2 per acre. His dealership licence for pesticides should be pulled!
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