Calibration is defined as:

• A. Determining the amount of spray material to apply to a specified area.
• B. Measuring the nozzle discharge rate without applying chemical
• C. Checking the wind speed during application
• D. Selecting the correct sprayer type

Answer: (A)

Calibrating a sprayer is figuring out exactly how much spray material is applied to a specific area. This means measuring how much chemical the system delivers over a known ground area so you can set the equipment to meet the label rate. It ties together nozzle output, swath width, and travel speed, and then you adjust nozzle choice, pressure, or speed to hit the desired gallons per acre. This ensures effective control while avoiding overdosing or underdosing.

Measuring nozzle discharge without spraying doesn’t tell you the actual area-based rate you’d apply in the field. Checking wind speed is about drift risk and safety, not the amount you’re applying. And selecting the sprayer type relates to what the system can do, but calibration is the process of determining and adjusting the actual application rate.