How spray characteristics and orientation may influence spray drift in a wind tunnel
Résumé
Crop protection product application may be subjected to drift. This paper aims at studying the effect of wind direction on drift and nozzle classification accordingly to [ISO 22369-1]. Experiments were realized in Irstea wind tunnel with wind speeds varying from 2 to 7.5 m.s-1 oriented in frontal or lateral position to a narrow spray boom including from 1 to 4 nozzles. A first set of experiments were conducted with the reference nozzle in frontal or lateral position and with 1 to 4 nozzles. A second set of experiments were conducted with a wide range of low drift nozzles (19 Flat Fan Air injection and 8 Twin jets Flat Fan Air Injection) with four nozzles at 7.5 m.s-1 wind speed. The results showed that DRF and DRL classification was significantly different depending on the nozzle type and working conditions. A global discussion is proposed for methodological aspects and practical conclusions for nozzle classification.
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