Research on TeeJet AI 80 03 VS spray nozzles for drift reduction classification

In this study, the nozzle type TeeJet AI 80 03 VS is investigated to classify its drift reduction potential for downward spray applications. The uniformity of the spray distribution below a sprayer boom was tested on a patternator for the appropriate nozzle height (lowered boom: 0.30 m). The resulting coefficient of variation (CV) was less than 10% at 2 bar liquid pressure. Measurements of droplet sizes and velocities were carried out using a PDPA drop sizing system. The results of these measurements were used in the IDEFICS spray drift model, as required for a classification of DRD75 or higher. Spray drift deposits on a standardized ditch were computed, from which the drift reductions compared to the reference situation were derived. The results of this study indicate that nozzle type TeeJet AI 80 03 VS at a liquid pressure of 2 bar qualifies for classification as DRD90 for lowered boom spray applications.