See if the sprayer is in good mechanical condition and functioning properly. Also consider ground speed, pressure, timing, nozzle selection and placement, air speed and direction, and spray volume. Better coverage can be obtained at the lower speeds. Pressure in the spray system also affects coverage. Manufacturers recommend a pressure range for their machines, usually from 60 to 260 pounds per square inch.
Manufacturers also provide nozzle arrangement setups.
The number of nozzles may vary from 5 to 10 nozzles per side. Proper positioning of the air guide or director will aid in the proper placement of the spray on the target. Nozzle size, pressure, and speed all determine spray volume. First select the desired spray volume and speed, then determine nozzle size and pressure. Spray volume may vary form 15 to 400 gallons per acre.