Tree Fruit Research & Extension Center

Apple IPM Transition Project

Efficient Use of Speed Sprayer Technology

Move mouse over text to view visual guide to terms used in the calculations. Move the mouse away to hide image.

Orchard Information

tree height (ft)
canopy drip line (tree radius, ft)
lower canopy distance from ground (ft)
tree spacing (ft)
drive row spacing (ft)

Tractor/Sprayer Information

fan (cfm, sm PTO @35,000; lrg engine @60,000)
tractor speed (mph)
fan height from ground (ft)
ducting angle


time to turn (seconds)
drive row length (ft)
orchard side (=orchard width, ft)


Effect of Tractor Speed on Air Displacement

Effect of Tractor Speed on Time to Spray an Acre

End Calculations





WSU-Tree Fruit Research & Extension Center, 1100 N Western Ave., Wenatchee, WA 98801 509-663-8181, Contact Us