What are the most important factors affecting off-target drift aside from external factors?

The most important factors affecting off-target drift, aside from external factors, are the size of the spray droplets and their percentage within a certain size range. This is because smaller droplets are more susceptible to being carried away by wind and other atmospheric conditions, leading to increased off-target drift. Conversely, larger droplets tend to fall more quickly and are less affected by wind.

Understanding the relationship between droplet size and drift potential is crucial for aerial applicators aiming to minimize drift and ensure that the pesticide or fertilizer reaches its intended target. By selecting the appropriate nozzle settings and maintaining droplet size within an optimal range, applicators can significantly reduce the risk of off-target application, thereby protecting neighboring crops, wildlife, and the environment.

While wind speed and direction, temperature, humidity, and the height of the aircraft are all important considerations in aerial application, the droplet characteristics directly influence the likelihood of drift, making them a primary focus for effective application strategies.