GPA, in calibration terms, stands for what?

• A. Gallons per angle
• B. Gallons per acre
• C. Grains per acre
• D. Gallons per application

Answer: (B)

GPA represents how much spray you apply for each acre treated. In calibration terms, it’s the rate of application: gallons of spray solution divided by the number of acres covered. This helps you set up and judge equipment so the spray lands evenly across the field. For example, using 60 gallons to cover 3 acres gives a GPA of 20 gallons per acre. That aligns with typical labels and guides how you choose nozzle types, pressure, and ground speed to achieve the target coverage. The other options aren’t used for this purpose: gallons per angle isn’t a defined measurement in spraying; grains per acre measures weight of a solid per area, not liquid spray rate; and gallons per application only tells total volume of one spray event, not the rate per area.