Which factor has the largest impact on spray rate?

Which factor has the largest impact on spray rate?

• A. Ground speed of the sprayer.
• B. Nozzle color.
• C. Ambient air temperature.
• D. Pesticide formulation.

Answer: (B)

The thing that controls how much liquid comes out of the sprayer each minute is the nozzle’s flow rate, which is determined by the nozzle size. Nozzle color is used as a quick reference to that size, because different colors represent different flow rates at a given pressure. So, changing the nozzle color effectively changes how much liquid is discharged per minute, which directly sets the spray rate.

Ground speed affects how much area you cover per unit time (gallons per acre), not the amount coming out of the nozzle each minute. Ambient temperature and pesticide formulation can influence things like viscosity a bit, but they don’t drive the rate as much as the nozzle's size (color) does. Hence, the nozzle color, by signaling the nozzle size and thus the flow rate, has the largest impact on spray rate.