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Use the following worksheet to determine how many gallons to mix based on available spray hours. To complete this
worksheet, the applicator will need to know the nozzle spray width (feet), ground speed (mph), desired work day length
(hours), and the gallons per acre (GPA) application rate of the equipment. Reset the spray truck control panel to the
appropriate settings. The recommended GPA of the herbicide solution can be found on the herbicide product label.
This worksheet is designed for one nozzle; if multiple nozzles will be used the worksheet
will need to be repeated for each nozzle. Check the nozzle manufacturer's specifications
calibration table to determine flow rate in gallons per minute (GPM) based on nozzle
spray width, pounds per square inch (PSI), GPA, and ground speed.
PRODUCTION BASED ON WORK HOURS WORKSHEET
CALCULATE TIME NEEDED TO TREAT ONE ACRE:
1. 43,560 (square feet per acre) ÷ (feet) nozzle spray width = (A) linear feet in 1 acre
2. 0.000189 (mile per foot) x (A) linear feet in 1 acre = (B) lane miles in 1 acre
3. (B) lane miles in 1 acre ÷ (mph) ground speed = (C) hours to spray 1 acre
CALCULATE ACRES TREATED PER DAY:
4. (hours) desired work day length ÷ (C) hours to spray 1 acre = (D) acres sprayed per day
CALCULATE AMOUNT OF HERBICIDE SOLUTION NEEDED:
5. (D) acres sprayed per day x (GPA) application rate = (gallons) amount of herbicide solution to
mix for available spray hours
