In airblast sprayer calibration using the tank level method, what is the required calibration plot size range?

• A. 0.05-0.5 acre
• B. 0.1-1 acre
• C. 1-2 acres
• D. 2-5 acres

Answer: (B)

When calibrating an airblast sprayer with the tank level method, you’re tying the amount of spray you use to the area it covers so you can calculate gallons per acre. The calibration plot should be large enough to give a representative sample of deposition but not so large that the process becomes unwieldy. A range from 0.1 to 1 acre hits that balance: it’s big enough to reduce edge effects and provide a stable measurement, yet small enough to manage reliably in a practical test. Using a plot within this size range helps ensure the resulting rate calculation is accurate without unnecessary effort. Smaller plots can exaggerate variability, while much larger plots aren’t needed for the calibration itself.