What is often considered the least important part of the apparatus when controlling spray drift?

When assessing the components of herbicide application equipment and their influence on spray drift, tank size is typically regarded as the least important factor. This is primarily due to the fact that the tank's capacity does not directly impact the droplet size, spray distribution, or the momentum of the spray, all of which are critical in determining how much spray drifts away from the target area.

In contrast, the other components such as nozzle type, herbicide mix, and pressure settings play significant roles in the dynamics of the spray. Nozzle type influences droplet size and pattern, thus affecting how far and how evenly the herbicide is dispersed. The herbicide mixture can have different physical properties that may also alter its behavior when atomized into a spray, impacting drift potential. Pressure settings are critical as they can change the velocity of the spray and the size of the droplets produced; higher pressure generally leads to smaller droplets that are more prone to drift.

In summary, while all these factors contribute to the effectiveness of herbicide application and spray drift prevention, tank size does not directly influence the spraying mechanism and is therefore considered the least significant when it comes to controlling spray drift.