Adjust boom height, which may also be referred to as nozzle height, for each spray angle and nozzle spacing to establish the best coverage. Proper boom heights for various spray angles of nozzles 20 and 30 inches apart are shown below. Spacings other than these require different boom heights. Drops produces at pressures of 40 psi and higher are finer and more susceptible to drift. When spraying foliar-applied herbicides, however, use pressures of 40 to 60 psi.
Fine drops produces with high pressure cover plant surfaces better.
Use even flat-fan nozzles only for banding pesticides over the row at 15 to 30 psi. Even flat-fan nozzles are frequently used with planting equipment. Adjust boom height for the desired spray band width. Band widths for various boom heights are shown below. The wide spray angle allows wider nozzle spacings and lower boom heights for broadcast spraying.