Bestway field-pro IV 1600, Operator'S Manual

Page: 44 / 96

D11
•
Boom height - Boom height is an important factor in controlling drift. A boom that is set
too high obviously favors drift, since droplets have farther to fall, thus having more time
and opportunity to drift off course. Doubling the boom height, in effect, doubles the
length of time required for droplets to reach the target canopy. That, in turn, doubles the
horizontal distance droplets can travel during their fall.
Managing Drift
To manage drift while spraying herbicide with the Field-Pro IV:
•
Spray when wind velocity and direction doesn't favor drift. Do not spray when winds are
gusty or under any condition which will allow drift to move to an off-target area. That
includes spraying when wind is blowing toward a crop that doesn't have a resistant
gene, such as Roundup Ready crops.
•
Use a combination of nozzles and spray pressures that minimizes fine droplets. Keep spray
pressure within the range suggested by the nozzle manufacturer and use a larger nozzle –
one that delivers 10 to 20 gpm – if necessary.
•
Keep boom height at the lowest possible effective height while spraying.
Spray Nozzle Selection
Nozzle, or spray tip, selection is often based upon droplet size, which
refers to the diameter of an individual spray droplet. In addition to its impor-
tance in controlling drift, droplet size from a nozzle becomes important when
the efficacy of a particular crop chemical is dependent on coverage. Always
refer to the chemical label for recommendations on spray tip size and type.
•
The majority of nozzles used in agriculture can be classified as pro-
ducing either fine, medium, coarse or very coarse droplets.