ALPHA PLUS HARDI NOVA
DD EE SS CC RR II PP TT II OO NN AA NN DD OO PP EE RR AA TT II OO NN
CHAPTER
22-
22
To control wind drift the influence of wind speed and wind direction as well as the horizontal air current
around the boom due to forward speed must be minimised. Because it is a sum of two forces with variable
direction and size that we have to counteract for, the following can only be very rough guidelines.
NNOOTTEE !!
Often it will be necessary to drive with two different anglings, so the angling is changed when chan-
ging driving direction after turning at the headland.
Wind direction Angle / air speed
Head wind : Angle forward
Down wind : Angle back (if the forward speed is higher
than the wind speed : angle forward)
Side wind / No wind : Angle vertical or back. Only high forward
speeds may require forward angling.
Crop condition Angle / air speed
Bare ground : Low air speed and angling back will often be the best
low vegetation setting to avoid
Dense crop: The angling feature is ideal to help opening the canopy
and improve penetration. If you follow the crop
movement as you are varying the angling you will find at
certain settings the crop will open more for penetration
If wind speed, wind direction or for some reason forward speed changes during spraying the optimum
angling is likely to change too. Be aware that with certain combinations of air speed and angling you can
‘’close’’ or flatten the crop and make penetration impossible - follow the crop movement intensively espe-
cially when setting the air assistance and keep an eye on the crop all through the application. NOTE !
Conditions Air speed recommendations
Bare ground/ low crop : Use maximum air within the possible range
Taller crop : Deeper crop penetration requires more air on
the sprayer (if you are in doubt check with
water sensitive paper)
Forward speed : Higher forward speeds require more air on
the sprayer
Volume rate : Lower volume rates require more air
assistance to avoid drift
SStteepp 22
: Set the optimal air speed within possible the range mentions above.
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