not mix more solution than is required for the operation.
INSTRUCTIONS FOR THE ADVANCED SECTION (FIGURE 5)
You've measured the actual calibration rate of the sprayer. You want to spray a cali- bration rate of 2.0 gallons per 1000 square feet. Determine how to make the adjust- ments in question #1 and #2. 1. If you only want to change your
sprayer speed to achieve the new calibration rate, how fast would you need to go? MPH = 136.36 X GPM divided by CR x W 2. Instead of changing your speed to
achieve a new calibration rate, you decide to change only nozzle flow. What is the new GPM? Do you need to select a larger nozzle or just change the pressure? GPM = CR X MPH X W divided by 136.36 3. This is a useful method to calculate
your actual nozzle operating pressure. The formula allows you to compare field meas- urements to nozzle performance charts. This calculation is used primarily to track the amount of pressure drop in your sprayer. GPM (1) = Measured nozzle flow from
sprayer (Actual Catch). GPM (2) = Flow rate from nozzle per- formance chart. PSI (1) = Actual nozzle operating pres-
sure. PSI (1) is X, the unknown value. Find X to solve the equation. PSI (2) = Nozzle pressure from chart that corresponds with GPM (2).
LAWN GUNS, BACKPACK AND BOOMLESS SPRAYER CALIBRATION (FIGURE 6)
1. Pick a level turf area and mark a rec- www.stma.org
SportsTurf 23
FIGURE 6
