I bought some poast to spray on my clove field this weekend. It only said 1 pint per acre but did not say how much water to mix it with. Can someone help me with that? Thanks

I' ve had good results with Vantage (which is basically poast) at about 2.5oz/gallon.

when i use my home made 10' boom sprayer behind the riding mower, i use 15 gallons of water, plus the recommended amount of herbicide, per acre.

Barlie,
You won' t like this answer, but you will have to figure out how much on your own because it will depend on your spraying rig and the speed that you are spraying. That pint will have to be spread over a whole acre. You will need to guage your spraying rig and determine the amount that it sprays out as well as adjust for the speed that you are traveling. The object is to add enough water and travel at a constant speed so that one pint will cover an entire acre. If you go too fast or do not add enough water, you will not be able to cover that acre (concentration too high). If you go too slow or add too much water, you may not get enough chemicals out to kill the grass (concentration too low). Remember that speed that you are traveling and pressure or output of your sprayin rig will be the variables. A rate that I dilute out to may be different then what you will need to dilute.

On the good side, you do have a lot of room to play with. I believe the amount of chemicals that is needed to work on grass (at least with Select which I think is similar to Poast) varies from 8 oz to 16 oz per acre. So if you can get it somewhere within that range, you should have good results. I may be off with number of ounces per acre, but you should get the ideal. I general error on side of having chemicals left over and may run over parts of my plots twice.

Good luck and sory for not being able to give you a direct amount.

Where can these products be purchased at? local garden centers? Ag centers? internet?

New plot planted two weeks ago, clover and brassicas. Growing good but still some grasses in the field. Will need to spray a Poast type product in a few weeks. wanted to give the plot a chance to get a good start before I spray.

greg is right. when i calibrated my sprayer, i measured the output in ounces for each of the 6 nozzles of my boom and added it up. i think it was around 22 oz per minute per nozzle, or 132 oz per minute total output. then i calibrated the speed of my riding mower in 1st, 2nd, and 3rd gear. i went something like 198, 244, and 348 feet per minute. my boom sprayer is 10 feet wide and puts out an 11 foot spray. so in 2nd gear, i could travel 244 linear feet, spray 2684 square feet, and put out 132 oz of mixture, all in one minute. my 15 gallon tank will run for 14.5 minutes. if i ran it in 2nd gear for 16.2 minutes, i would travel 3952 feet and cover 43480 square feet (which is close to an acre). it' s not exact, but it' s close. follow the math and the logic behind it, if you know how much of a spray your putting out, how wide of a pattern your spraying, and your speed, you' ll be able to put it out correctly.

Thanks for the input. I am going to be using a little 4gallon back pack sprayer. Can it be diluted too much? I would rather mix it with water and go over an acre. If I still have some left then I know I need to reapply. I just think that would be better than too high of a concentration.

yes, it can be diluted too much. this is what happens...not enough active ingredients are in your solution to achieve the desired effect (like non alcoholic beer, it' s something like 0.5%). or, you have to apply so much of the solution that the majority of it runs off the vegetation and onto the ground.

if i was you, i would fill the sprayer with just 4 gallons of water and see how much of an area you can spray to totally cover the blades with droplets without having any of it run off. it may be 1/5, 1/4, 1/3, 1/2, 2/3, or 3/4 of an acre. once you know how much you can cover with the 4 gallons, you will know what percentage of the pint to apply to the 4 gallons. example: 4 gallons of water covers 1/3 of an acre. use 1/3 of a pint in your mix. spray the solution, repeat for the next 1/3, and repeat for the final 1/3.

it' s cheaper to spray water to get your system calibrated than it is to spray the poast on a trial and error, wait and see basis.

I get a bit scared when I see some of the posts on how to calibrate, mix or use agrichemicals. Ive been in this business for nearly 30 years and I have used the following hundreds of times. It works for any sprayer. Just remember to keep the pressure pumped up and dont go from max to none.


Easy Backpack Sprayer Calibration


Step 1: Mark off a area 18.5 feet by 18.5 feet
Step 2: Spray the area uniformly with water noting the number of seconds required
Time Required_____________seconds
Step 3: Spray into a bucket for the same number of seconds.
Step 4: Measure the number of ounces collected in bucket
Volume sprayed____________ounces
Step 5: The volume sprayed equals gallons per acre
Gallons per acre___________gallons

Adding the correct amount of herbicide to the tank

Step 6: Record Gallons/acre from Step 5 _____GPA
Step 7: Determine Volume of Spray tank
Tank Volume_____________gallons
Step 8: From Product Label, determine rate per acre of concentrate. Rate/acre__________pints/ounces
Step 9: Calculate the amount of concentrate to add to one backpack or sprayer fill:
A: Gallons in sprayer____2____
B: Sprayer Rate per acre of water___20____
C: Divide A by B….2/20=1/10 acre
D: From Label Rate in Step 8, multiply rate per acre by C. Example 1 pt/acreX1/10= 1/10 pt per sprayer fill.

Liquid Conversions
1 Cup = 8 ounces 1 Quart = 4 cups
1 Cup = 16 Tablespoons 1pint =2 cups
16 Tablespoons = 48 teaspoons 1 pint = 16 ounces
1 Tablespoon =3 teaspoons 1 ounce = 2 Tablespoons
1 pint = 96 teaspoons 1 pint = 32 Tablespoons
1 teaspoon = approx. 7cc 1 Tablespoon =20 ml=20cc
1 Quart = 64 Tablespoons


 In the example above, you would add 1/10 of a pint per tank full to achieve 1 pint per acre. 1/10 of a pint is 3.2 Tablespoons or 64 ml or 64 cc’s.
 For powders, you must compute the weight in ounces per teaspoon or tablespoon to figure the rate per acre. A good low cost tool for that is a postal scale. Many labels have conversions to rate per 1000 ft/square in teaspoons or tablespoons.
 To calculate rate your sprayer puts out per 1000 ft square, divide the gallons per acre in step 5 by 43. If rate per acre is 30 gallons, the rate per 1000 ft square is .70 gallons per 1000 ft square. If a product rate is 2 tablespoons per 100oft square, then in a 3 gallon sprayer you would divide 2 Tablespoons by .70= 2.85 Tablespoons per gallon. 2.85 Tablespoons per gallon times 3gallons in sprayer= 8.5 Tablespoons per tank fill.


Rate per Acre Rate per 1000 ft square
1 Quart 1.5 Tablespoons
1 Pint 2.25 Teaspoons
8 ounces 1.1 teaspoons