Semi-dwarf apple trees were treated with foliar micronutrients using t
wo different forms of orchard air-carrier sprayers. The effects of fan
speed, travel speed, and spray emission patterns on in-canopy air spe
ed and spray deposition were evaluated. The FMC Economist fan outlet a
ir speed did not significantly affect deposit patterns. Deposit levels
and patterns were influenced by changes in the spray emission pattern
and by the position of the fan and nozzle manifold assembly. An 8% di
fference in the output between the upper and lower half of a nozzle ma
nifold on the FMC Economist sprayer did shift, although not significan
tly, the vertical spray deposition in the canopy. The raised fan and n
ozzle manifold assembly of the Friend Air Kadet II produced the best v
ertical distribution of spray deposits. Increasing travel speed from 0
.9 to 1.3 m/s did not significantly decreased air speed within the tre
es. In-canopy air speed measurements followed patterns similar to the
spray deposits but there was not a good correlation between air speed
and one-pass spray deposit.