Which of the following factors influences droplet size in spraying?

Nozzle pressure is a crucial factor that influences droplet size in spraying. When the pressure of the spray nozzle is increased, the liquid pesticide is forced through the nozzle with greater force, resulting in smaller droplets being generated. Higher pressure tends to break the liquid into finer droplets, which increases the surface area of the spray and can enhance the efficiency of the pesticide application.

In contrast, lower nozzle pressure typically produces larger droplets, which may lead to more rapid settling on the target area but can also result in increased drift, as the larger droplets may not adhere effectively to the target foliage or surfaces. Understanding the relationship between nozzle pressure and droplet size is vital for achieving effective pesticide coverage and minimizing off-target movement.

While other factors like the type of pesticide, humidity levels, and ground temperature can affect overall spraying effectiveness and operational conditions, nozzle pressure directly influences the physical characteristics of the droplets during the application process.