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Airflow studies around a simple shroud showed a low pressure area behind the shroud that lifts droplets out of the crop canopy and lifts them into the air to become airborne drift. An airfoil redirected the frontal jet, eliminating the low pressure area and reducing drift to less than 0.5% off-target deposit. Mechanically controlled drift gives the industry the ability to apply chemicals with mist-size drops to increase coverage and reduce carrier volumes to 10 L/ha. Freedom from drift means that chemical can be applied in the wind, greatly increasing the application timing accuracy and, consequently, improving reliability. Also, less drift means less contamination of both non-target humans and plants, thereby increasing operator safety. Field tests demonstrated the extra control and reduction in carrier afforded by mist-size drops.
shrouded sprayers, drift, reduced carrier volumes, reduced chemical volumes
president, Rogers Engineering Inc., Saskatoon, SK