How is the application rate determined in the airblast tank-level calibration method?

• A. Dividing gallons of water by the area sprayed
• B. Multiplying area sprayed by gallons of water
• C. Subtracting area sprayed from gallons
• D. Adding area sprayed to gallons

Answer: (A)

In this method, you’re measuring how much spray you actually use per unit area, so the answer is gallons per acre. You spray a known area under normal operating conditions, record the total gallons used from the tank, and then divide that number by the area sprayed (in acres). The result gives the application rate in gallons per acre, which you can compare to the label rate.

If your measured area is in square feet, convert it to acres (1 acre = 43,560 square feet) before dividing. The other arithmetic options don’t yield a meaningful rate: multiplying gallons by area would give a combined product with incorrect units, while adding or subtracting area and gallons isn’t a valid way to express spray rate.