Roundup mixture

ssgshelton · May 1, 2014

How many ounces of roundup do I need for spraying my cornfield prior to planting. I have a 55 gal tank and want to fill it up. First year of using this tank and roundup ready corn. The instructions for spraying confuse the heck out of me.
Thanks

Greg K · May 1, 2014

IIRC, it is 16 oz/acre to burn it down. So that being said you need to know how many gallons/acre you are putting out of your sprayer. This is a combination of nozzle size and speed. Pretty much we need more info.

ssgshelton · May 1, 2014

Thanks. I'm putting down about 12 total gallons per acre based on my chart of 40psi and 5 mph. It's a fimco sprayer and tips. I may cut it down to 30psi and 10 gal per acre to cut down on drift. Thanks

ssgshelton · May 1, 2014

So do I need about 72oz of chemical per 55 gal tank based on those speeds and pressure?

IaGary · May 1, 2014

Adding to what greg said. Fill your tank with water spray it out and calculate how many acres you covered.

round up as well as all chemicals are sprayed so many oz, pts, or quarts to the acre, not per tank full of water.

Also the amount of Roundup needed is based on the size of the target weeds or grass you want to kill.

Tall weeds need more roundup to kill than small weeds.

Growing conditions also determine how much Roundup is used. 50 degree and 100 degree weather need more Roundup than 80 degree temps.

There is more to spraying than dumping in the chemicals and spraying it.

There are times I use 16 oz. and go as high as 40 oz to the acre.

Then you have the additives to go with the Roundup to get a better kill on weeds. That's a whole other story.

Best to read the label or talk to your local agronomist.

If you buy from a company that sprays and has an agronomist it may be better than buying from a farm fleet store that has no clue what they are selling.

Just my thoughts.

Gary

VicS · May 1, 2014

The rate of real roundup for Southern Il. is 22 oz. If using generic 32 oz. or one quart. I use a quart and a half. Or one quart of real Round-up. To see how much water you are spraying. Pick a pressure 20 to 30 psi. drive one mile down a road or a field road spraying at the speed you want to go. After you have went 1 mile check how much water you have used. then take your boom with times 5280 ft Say your boom is 20 ft X 5280 distance you have went. 105600 sq ft.divided by 43560 sq ft in a acre. 2.24 acres. Maybe you have used one half of your 55 gal.(about right) 27.5 gal on 2.24 acres. Divide 2.24 into 27.5 = 12.27 gal per acre. So your 55 gal tank. Better just call it 50 gal. (can't get it all out or get it plum full) So you can spray 4 acres. So put 1 gallon of Round-up in and go. I would start with BLUE flat fan tips, 15 inch centers. And 25 psi. 6 mph. Should be about right. Vic

Greg K · May 1, 2014

Listen to IA Gary and Vic on this. They have probably forgotten more about this than I will ever know.

VicS · May 1, 2014

I'm sorry I didn't read far enough. See you have already figured it out. I never use additives, just more roundup. You can double or even triple the rate and still be cheaper per acre. Have fun! Vic

casecollectorsc · May 1, 2014

At ten gallons per acre of water, you would spray about 5 acres. 5 acres times 22 oz. per acre = 110 ozs. or 3.4375 quarts of Roundup in the tank mix.

Roundup mixture

ssgshelton

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