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United States Department of Agriculture

Agricultural Research Service

Title: Spray Deposition in Taxus and Air Velocity Profile for a Five-Port, Air-Assist Sprayer

item Zhu, Heping
item Derksen, Richard
item Krause, Charles
item Brazee, Ross
item Fox, Robert
item Ozkan, H - OSU

Submitted to: ASAE Annual International Meeting
Publication Type: Proceedings
Publication Acceptance Date: April 8, 2004
Publication Date: August 2, 2004
Citation: Zhu, H., Derksen, R.C., Fox, R.D., Brazee, R.D., Fox, R.D., Ozkan, H.E. 2004. Spray deposition in taxus and air velocity profile for a five-port, air-assist sprayer. ASAE Annual International Meeting. Paper No. 041032.

Technical Abstract: Nursery growers are seeking new sprayers that can discharge droplets uniformly within Taxus spp. canopies to obtain healthy and marketable plants. A custom-designed five-port, air-assist sprayer was investigated to improve spray penetration into taxus canopies in a production nursery. Air velocity profiles from nozzle outlets to 0.79 m below the nozzles were determined experimentally and mathematically. Spray deposits at top, middle and bottom of canopies were characterized using fluorescence detection, and were compared with two application rates. The air velocity decreased from 40.1 to 19.4 m/s when the distance from the orifice increased from 0.33 to 0.79 m. Variations of air velocities across the same level above the ground decreased as distance from the nozzle increased. Tests indicated that increasing application rate by 34% could increase spray deposition at the bottom of canopies by 42%. Spray deposits increased as the air velocity at target positions increased.

Last Modified: 5/5/2015
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