Before applying, what should you confirm during spray calibration?

• A. Use only label rate
• B. Confirm GPM, swath width, ground speed, and target GPA
• C. Calibrate after application
• D. Rely on experiences from other fields

Answer: (B)

Before applying, you verify that the sprayer will deliver the intended amount by checking four key factors: the actual gallons per minute the pump is producing, the swath width the nozzle and boom setup will cover, the ground speed you’ll be traveling at, and the target gallons per acre you plan to apply. Each piece matters because it all ties into the rate per area. If the pump isn’t delivering the expected GPM, the spray won’t reach the labeled rate; the swath width determines how much area you cover per pass, so an incorrect width changes how many acres are treated per hour; your speed directly affects how much solution is deposited per acre—going faster uses less per acre, slower adds more; and the target gallons per acre is the rate you’re aiming for, which you confirm by testing and adjusting during calibration. Performing a test (such as a catch-can check) lets you compare real output to the target and tweak pressure, nozzle Selection, or pump settings until the delivery matches the label. This approach is necessary because simply assuming the label rate is correct or relying on past experiences from other fields won’t account for the specific equipment, field conditions, or product, and calibrating before application avoids under- or over-application and helps protect people, crops, and the environment.