How Spray Characteristics and orientation may influence spray drift in a wind tunnel

摘要

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 FlatFan Air Injection) with four nozzles at 7.5 m.s~(-1) wind speed. The results showed that DR_F and DR_L 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.