Which of the following can affect the amount of drift?

• A. Droplet size
• B. Spray pressure
• C. Nozzle height
• D. All of the above

Answer: (D)

Drift is affected by how the spray behaves in the air, which depends on droplet size, spray pressure, and how high the nozzle is above the target. Smaller droplets are lighter and more easily carried by wind and air currents, so they can travel farther and off-target. Spray pressure determines how finely the liquid is atomized: higher pressure tends to produce smaller droplets and increases drift potential, while lower pressure yields larger droplets that tend to deposit closer to the target. The height of the nozzle above the target also matters: spraying from a greater height gives droplets more time and space to be moved by wind before they reach the surface, increasing drift risk; keeping the nozzle lower reduces that opportunity. Because each of these factors can raise or lower drift, they all can affect the amount of drift.