What size boom is the most suitable?

This is something that is unique to your property and application. You should not simply choose the biggest boom size available – you need to consider how practical the boom will be across your terrain and how it matches up with other equipment on your property. The effect of directional changes obviously increases with bigger booms. Wider booms are more prone to application rate variability on the outer sections, and the yaw effect increases exponentially as weight and length increase. When selecting the most suitable boom for the job the objective should be to choose the one which will provide the best chemical placement, resulting in the best chemical performance, not necessarily the boom which will cover the most amount of area in a day.