Select the desired nozzle spacing and spray volume. If these are not given on the pesticide label, follow University and Chemical Company recommendations. Correct selection of a spray volume is important. It will influence several spray characteristics such as drift potential, the spray coverage, droplet size, acres per tank and pesticide efficacy. As a rule of thumb, the greater the operating pressure or the greater the spray angle, the smaller the droplets become.
Smaller droplets increase the drift potential.
As the orifice opening becomes larger, the droplets increase in size. Calculate Required Nozzle Discharge . Consult the Nozzle Catalog . Remember, most nozzles only perform over a limited pressure range. A linear relationship does not exist between pressure and flow discharge.