In a postemergence broadcast application using regular flat-fan nozzles spaced 30 inches apart, using the ounce method, what spray rate was determined?

In a postemergence broadcast application using regular flat-fan nozzles spaced 30 inches apart, using the ounce method, what spray rate was determined?

• A. 5 gpa
• B. 10 gpa
• C. 15 gpa
• D. 20 gpa

Answer: (C)

The ounce method ties nozzle output to rate per acre. You measure how many ounces each nozzle delivers per minute at the operating pressure while moving at the target speed, then convert that into gallons per acre using the known nozzle spacing. With regular flat-fan nozzles spaced 30 inches apart, this setup (typical pressure and speed used for postemergence broadcasts) yields about 15 gallons per acre. So the measured spray rate is 15 gpa. This rate would change if spacing, nozzle type, or speed were different, since those factors determine how much product covers each acre for a given nozzle flow.

The ounce method ties nozzle output to rate per acre. You measure how many ounces each nozzle delivers per minute at the operating pressure while moving at the target speed, then convert that into gallons per acre using the known nozzle spacing. With regular flat-fan nozzles spaced 30 inches apart, this setup (typical pressure and speed used for postemergence broadcasts) yields about 15 gallons per acre. So the measured spray rate is 15 gpa. This rate would change if spacing, nozzle type, or speed were different, since those factors determine how much product covers each acre for a given nozzle flow.