Roundup mix instructions

[RalphWD45]

I turned over an acre, of my pasture sod, and planted RR BT corn, for my chickens. It has been cold and rainy, since I planted, and the corn is just now coming up. the grass has been growing just fine, and is threatening the corn. I bought a 3pt roller pump sprayer , with short booms, and would like to spray, as soon as it quits raining. I have a little booklet from roundup, but cant figure out how much per gallon, to use. there is too much info in the booklet, and if it is in there , then I've missed it. I have a 50 gal tank. anyone want to tell me how many oz per gallon, to kill grass?

 

[IaGary]

There are about three things I don't know before I can tell you how much Roundup to add.

First of all how many gallons of water are you gonna spray per acre?

How large is the grass that you are going after?

Are you using any other surfactants along with the Roundup?

All chemicals are sprayed at a rate per acre. Not a rate mixed with so many gallons of water.

Oh yeah you can just put so much Roundup per gallon and go but you have no idea what rate you are putting per acre until you know how many gallons of water per acre your gonna apply.

For my grass pasture that I sprayed to put beans in notil, I use 15 gallons of water,48 ounces of Roundup and 2#of Ammonium Sulfate per acre.

You may have to put in straight water and run over your acre to know what your gonna use unless you got a chart with it to tell what size nozzles it has and travel speeds you need to run with what pressure to apply so many gallons an acre.

Gary

 

[paul]

You need to know how many gallons of water your sprayer puts out. Different pressures, different sprayer tips, and different ground speed will make this real different.

So, you need to test. Put water in the sprayer, and see how long it lasts. Might as well spray water on your corn, and see how much water gets used to cover your 1 acre. You can be as low as 5 gallons of water per acre, or over 20 - it all depends on tips, speed, and pressure.

Then, put that much water into your sprayer, and add however much RU you use per acre (often 1 pint per acre for the 4lb types, or 27 ounces per acre for the 6lb types).

Always drive the same speed, with the throttle in the same place - unless you want to change the rate.

It is good to be spraying about 10 gallons per acre.

So, hopefully you will be mixing about 1.5 pints of roundup with about 15 gallons of water to cover your little more than an acre.

BUT, see how much water your sprayer is putting out per acre as you drive.....

--->Paul

 

[randallinMo]

Paul and IA Gary are telling you right. Do a Google search for "Sprayer Calibration using the "ounce" method". This is an excellent way for you to figure out how to calibrate your sprayer...........and it's simple. It uses the fact that there are 128 ounces per gallon, you know the speed and pressure you've got your rig running at, so you determine how far to drive to equal 1/128th of an acre based on your nozzle spacing. Drive this distance with your tractor and sprayer and time it. Then run the sprayer this length of time and catch the spray from one nozzle. This will equal the gallons per acre your sprayer is applying with the given speed and pressure settings you have.
I've done a poor job of describing how to do this...just google it up and read how to do it. It works.

 

[Anonymous-0]

You will fill the sprayer tank up two to four times depending on how long your spray boom is.
If your are using 41 % round up you will need to put 100 oz of round-up in each tank of water

 

[paul]

I see the humor in your message, but you did it so well someone might take you serious!

200-400 oz of RU on an acre - that would be a hoot.

--->Paul

 

[GordoSD]

Fill your tank up with water. Then start a stopwatch and turn the pump on. Determine how many minutes it takes to empty the tank.
Then figure the area you will cover at 6 mph.
Width of spray times 528 which is feet you travel in a minute. Then figure acres using 44,000 sq ft /ac.
Then add roundup to apply 1 qt per ac.

Gordo

 

[Ralph wd45]

Thanks Guys! It wasn't quite as easy as I had hoped, but after being put on the right track, I was able to get my corn sprayed. I ran a barrel of water first, like suggested, and was suprised that I had 10 gal left when, I had covered the acre. I went back and put 22 0z in 40 gal of water, and sprayed. Sure hope it all turns out ok!

 

[GordoSD]

40 gals of water per acre is way, way too much. Either you are going way to slow, the plot is more than an acre , or you don't have proper nozzles. You should be applying 10 to 12 gals per acre.
You need at LEAST 1qt RU per acre for weeds, more for heavy grasses.
I doubt you are going to see much evidence of that spray you did on the weeds.
Wait five days, check it, and maybe do it again right

 

[greenbeanman in Kansas]

Thank you for doing the job correctly instead of just going at it willy nilly. Helps save us from the regulators by doing it right.

 

[paul]

RU does not like that much water per acre. Many other sprays, it would be better; but RU is different. It prefers around 10 gal water per acre.

Perhaps you can drive a lot faster than you did; or you have real big tips on that sprayer for applying fertilizer?

Would be better to be using about 1/4 the water you did, if you want to get it real right.

If you have small weeds, it will probably be good. RU takes a few days to notice the kill. If it doesn't kill, you can go over it again with a little more. RU is pretty forgiving.

--->Paul