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Title: Spray Deposition and Off-Target Loss in Nursery Tree Crops with Conventional Nozzle, Air Induction Nozzle and Drift Retardant

Author
item Zhu, Heping
item Derksen, Richard
item Krause, Charles
item Brazee, Ross
item ZONDAG, RANDALL - OSU EXTENSION
item Fox, Robert
item Reding, Michael - Mike
item OZKAN, ERDAL - OSU

Submitted to: ASAE Annual International Meeting
Publication Type: Proceedings
Publication Acceptance Date: 4/24/2005
Publication Date: 4/18/2005
Citation: Zhu, H., Derksen, R.C., Krause, C.R., Brazee, R.D., Zondag, R., Fox, R.D., Reding, M.E., Ozkan, E.H. 2005. Spray Deposition and Off-Target Loss in Nursery Tree Crops with Conventional Nozzle, Air Induction Nozzle and Drift Retardant. ASAE Annual International Meeting. Paper No. 051007.

Interpretive Summary:

Technical Abstract: Spray deposits at various elevations within crabapple trees and on the ground were investigated with an air blast sprayer equipped with conventional hollow cone nozzles, air induction nozzles, and conventional hollow cone nozzles with a drift retardant in a commercial nursery field. Airborne deposits at three elevations on sampling towers and on the ground at several distances from the sprayer were also investigated with the three spray treatments in an open field without trees. Droplet size distributions across spray patterns were measured with a laser particle/droplet image analysis system. In general, there was no significant difference for deposits within nursery tree canopies and on the ground with three different spray techniques. With the 700 L/ha application rate, which was 360 L/ha lower than the rate normally used in nursery application, the tree canopies received over 4 to 14.5 times spray deposits actually needed from the air blast sprayer with the three spray techniques, and a large portion of spray droplets deposited on the ground.