Low drift nozzle spray patterns were similar to standard nozzles. The lower the CV, the more uniform the spray coverage. At standard spraying pressures and heights, spray coverage from the standard, low drift, extended range and turbo nozzles were uniform. The CV's in this report were determined in stationary laboratory tests. In the field, CV's may differ due to boom vibration and wind.
Different chemicals vary as to the acceptable range of application rates.
For example, 2,4-D solutions have a fairly wide acceptable range, while other chemicals may have a narrow range. Spray distribution from Turbo TeeJet TT nozzles was uniform over a wide range of spray pressures and heights. Figure 5 shows how nozzle pressure affected spray pattern uniformity for Turbo TeeJet nozzles and compares them to standard, low drift and extended range flat fan nozzles. The TT and XR nozzles produced acceptable patterns at all pressures tested, from 100 to 600 kPa. Standard and low drift nozzles produced acceptable spray patterns above 250 kPa.