The broadcast spray volume is used to determine how many acres the tank mixture will spray before refilling is required. Suppose a label recommends a spray volume of 20 gallons per acre and the producer operates a planter at 6 miles per hour. Based on pervious experience with crop cultivation, a 12-inch band width is desired. The row spacing is 30 inches. The nozzles are listed in the table without spray angles.
Final selection depends on the clearance behind the planting unit.
Mount nozzles and readjust the height until the band width is achieved. For 30-inch row spacing, measure out 136 feet in the field where planting will occur. With the planter in a stationary position, set the pressure at 26 psi. The number of ounces collected over 15.5 seconds the number of gallons per acre. Using an ounce graduated cylinder and a stop watch, adjust the pressure until the nozzle discharges 8 ounces during 15.5 seconds.