Key points

• Maintaining the correct nozzle height is critical for obtaining a uniform spray pattern and minimising the potential for spray drift

• Auto height control has become a standard feature on many sprayers, however, their ability to function correctly will depend on the boom design, sprayer set-up and calibration of the sensors

• Boom centres play an important role in boom stability and the functioning of height-control systems

• Before purchase, always consider what you require a boom to do, the type of terrain it will be operated in and the actual set-up, such as nozzle position and spacing.