How do you calculate GPA for spray application with a boomless nozzle?

When calculating the gallons per acre (GPA) for spray application using a boomless nozzle, the formula you need follows the logic of integrating the flow rate of the sprayer with the ground speed and the width of the spray. The correct formula, (GPM x 495) / (MPH x SW), is derived from the basic principle that gallons applied depend on how fast you’re moving (MPH) and how wide you are spraying (SW).

In this formula:

• GPM stands for gallons per minute, representing the flow rate of the nozzle.
• MPH is the speed at which you are traveling while spraying.
• SW refers to the spray width, which is how wide the nozzle covers the ground.

By multiplying GPM by 495, you convert the flow rate to a per-acre basis, as this factor relates to the number of minutes in an hour (60) and the number of acres covered (43,560 square feet in an acre). When you divide this product by the product of MPH and SW, you are effectively calculating how many gallons are being applied per acre given the speed and width of the application.

Thus, this formula provides an accurate method for determining the application rate, ensuring proper pesticide distribution for effectiveness and