What is the most important factor for controlling potential drift?

• A. Wind Speed
• B. Nozzle Type
• C. Droplet Size
• D. Temperature

Answer: (C)

Droplet size is the main determinant of drift because it directly controls how long and how far spray droplets stay airborne. Smaller droplets act like mist and are easily carried by even light air currents, remaining suspended and moving with the wind, which allows them to deposit far from the target. Larger droplets have more mass and momentum, so they settle out of the air more quickly and near the application zone, reducing off-target movement. While wind, temperature, and nozzle type influence drift, adjusting the size of the droplets produced by the nozzle is the most powerful, practical way to limit drift within typical spraying operations. Using coarser droplets—within label guidelines and appropriate nozzle choices—helps keep the spray on target and minimizes drift.