Which method is preferred to adjust GPM/GPA?

• A. Changing the orifice size
• B. Increasing the pressure
• C. Changing the nozzle color
• D. Replacing the tank

Answer: (A)

To control how much you apply per area, you want to set the flow coming out of the nozzle, and the most direct way to do that is by changing the orifice size of the nozzle. A larger orifice lets more liquid through each minute, increasing GPM and, with your travel speed and spray width, increasing GPA. A smaller orifice does the opposite. This method gives a precise, predictable adjustment to the application rate.

Increasing pressure can raise flow, but it also changes droplet size and spray pattern, increases drift risk, and can cause more nozzle wear, making the actual GPA less predictable. The color of a nozzle is just a code indicating size, not a mechanism to adjust flow by itself. Replacing the tank won’t affect how much chemical is deposited per acre.