Note seconds required to drive measured distance. If boom, catch spray from one nozzle during noted time. On directed rigs, catch spray from all nozzles per row for noted time. Nozzle or nozzle group output in ounces equals gallons per acre actually applied. Repeat for each nozzle to assure uniform distribution.
Worn nozzles increase application rates and change distribution patterns.
The result is poor pest control, crop damage, residue problems, and increased costs. A check of the boom sprayer assures that each tip is delivering an identical volume of spray in a smooth pattern with no heavy streams or blank areas. Should a nozzle become clogged, it is best to blow out the dirt with compressed air or use a soft-bristled brush such as a toothbrush. Wear waterproof gloves when handling and cleaning nozzles to reduce pesticide exposure. Remember, improperly functioning or worn nozzles are costly.