Which item is NOT a factor that can affect spray drift?

• A. Soil pH
• B. Droplet size
• C. Wind
• D. Nozzle type

Answer: (A)

Spray drift is the movement of pesticide droplets through the air away from the target during application. The main factors that influence this are how small the droplets are, the presence and strength of wind, and the design of the nozzle that determines droplet size and spray pattern. Very fine droplets are easily carried by even light air movement, stronger winds push droplets farther off target, and the nozzle type shapes the droplet size distribution and how the spray is applied, all of which directly affect drift risk.

Soil pH, on the other hand, affects what happens after the spray lands—how the chemical interacts with soil, including adsorption, degradation, and movement through soil—but it does not influence how droplets travel through the air during application. Therefore soil pH is not a factor that affects spray drift.