Research on spray nozzles from the Teejet AIXR-110 series for drift reduction classification

Seven nozzle types of the series Teejet AIXR-110 were investigated to classify their drift reduction potential for downward spray applications (at different spraying pressures). The uniformity of the spray distribution below a sprayer boom was tested on a patternator at a nozzle height of 50 cm. For all tested nozzle-pressure combinations the resulting coefficient of variation (CV) was less than 10%. Measurements of droplet sizes and velocities were carried out using a PDPA drop sizing system. For some nozzle-pressure combinations, the results of these measurements were used in the IDEFICS spray drift model, as required for a classification of DRD75 or higher. In those cases, spray drift deposits on a standardized ditch were computed, from which the drift reductions compared to the reference situation were derived. The following nozzle-pressure combinations appeared to qualify for classification as DRD50: • AIXR 110 015 VP at 3 bar • AIXR 110 015 VK at 2 bar • AIXR 110 02 VP at 3.5 bar • AIXR 110 02 VK at 3.5 bar • AIXR 110 03 VK at 4 bar • AIXR 110 04 VK at 5 bar • AIXR 110 05 VK at 6 bar Next, the following nozzle-pressure combinations appeared to qualify for classification as DRD75: • AIXR 110 03 VK at 2 bar • AIXR 110 04 VK at 2 bar • AIXR 110 05 VK at 3 bar