Sprayer Calibration & Tank Mixing

Backpack Sprayer Calibration

ATV Boom Sprayer Calibration

Tank Mixing

Follow these steps after you have calibrated your sprayer and determined its gallon per acre output (GPA). Your GPA will be necessary in determining how much product you should add to your tank. If you do not calibrate your sprayer and determine your GPA, you could be under applying or over applying product which can result in undesired or unsuccessful results.

Backpack Sprayer

The best way to determine how much product to add to your tank when using a backpack sprayer is to determine how much product you need for 1 gallon of water. 

1. Calculate how many acres you can treat with 1 gallon.   

     [ 1 gallon ÷ GPA = Treatable acres ]

2. Calculate how much product you need to add to 1 gallon of water to get the rate you are trying to apply. You may need to convert this value to a more usable unit (ie. ounces to mL, mL to grams, etc.)

   [ Treatable acres × Label Rate = How much product to add to 1 gallon of water ]

3. If you plan to mix a backpack with more than 1 gallon of water:

   [ How much product to add to 1 gallon of water × How many gallons of water you plan to use = Total product to add to your tank ]

Larger Mixes: Broadjets & Boom Sprayers

The best way to determine how much product to add to your tank when mixing large amounts is to mix your tank based on the GPA of your intended application method (ie. broadjet or boom spraying)

1. Calculate how many acres you can treat based on how many gallons your are going to mix in your tank.

   [ Gallons of water ÷ GPA = Treatable acres ]

2. Calculate how much product you need to add based on the label rate you are trying to apply.

   [Treatable acres × Label Rate = How much product to add to your tank ]

3. If you are using more than one herbicide in your tank, repeat Step 2 for other products that may have different application rates.