Bestway PRO-MOUNT 360, Operator'S Manual

Page: 41 / 91

D10
the horizontal distance droplets will travel.
•
Relative humidity - In general, the lower the humidity, the greater the drift potential.
•
Air temperature - In general, higher temperatures mean increased drift potential.
•
Droplet size - With most chemicals, controlling spray droplet size is a key factor in
controlling drift. The smaller the droplet, the slower it will fall, the faster it will evaporate
and the further it will drift horizontally, particularly if winds are also a factor. Droplet
size is primarily determined by nozzle orifice size, spray angle and spray pressure.
Therefore, an increase in nozzle orifice size and/or a decrease in pressure is one way to
increase droplet size and decrease the potential for drift.
•
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 chemicals with the Pro-Mount 360:
•
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.