Hours Winter Hours: May vary. Usually Mon-Fri 7:30 to 3:30
Calibration
How much chemical do you add to the tank?
An herbicide label specifies the amount to be applied per acre. What is added to your tank depends on the Gallons Per Acre (GPA) your sprayer puts out. GPA depends on:
The speed at which the pesticide is applied.
The output of your nozzles.
The pressure of the sprayer.
Product Mixing Rate (oz per gallon, lbs per gallon, etc.) = Application Rate (oz, fl oz, lbs) /GPA
Handheld or backpack sprayer calibration
Measure and mark an area that is 18.5' by 18.5' or equivalent (area is 1/128th of an acre).
Time the number of seconds required to spray the area uniformly using a steady sweeping motion and constant pressure.
Spray into a container for the time calculated in step 2.
The fluid ounces collected is the GPA for your sprayer. Volume sprayed in fluid ounces = Gallons Per Acre
Nozzle Volume Method for ATVs, Tractors, etc. with booms or boomless nozzles. Use This Form
Measure the spray width by measuring the wetted area covered by your boom or boomless nozzles.
Collect nozzle output for 1 minute- ounces per minute (OPM) is equal to the volume of liquid collected in ounces.
Use the equation given on the form to calculate GPA.