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Code F07012287
USE AND MAINTENANCE
ENGLISH
Fig. 145
WIND VELOCITY
Among the meteorological factors affecting drift, wind
velocity has the greatest impact. Increased wind speeds
cause increased spray drift. It is common knowledge that
in most parts of the world the wind velocity is variable
throughout the day (see figure).
Therefore, it is important for spraying to take place
during the relatively calm hours of the day. The early
morning and early evening are usually the most calm. Re-
fer to chemical label for velocity recommendations. When
spraying with traditional techniques the following rules-of-
thumb apply:
• In low wind velocity situations, spraying can be per-
formed at recommended nozzle pressures.
• As wind velocities increase up to 3 m/s, operating
pressure should be reduced and nozzle size in
-
creased to obtain larger droplets that are less prone
to drift.
Wind measurements should be taken throughout the
spraying operation with a wind meter or anemometer. As
the risk of spray drift increases, selecting designed to
more coarse droplets that are less prone to drift is ex-
tremely important. Some such TeeJet nozzles that fit into
this category
are: DG TeeJet®, Turbo TeeJet®, AI TeeJet®, Turbo Tee-
Jet® Induction and AIXR TeeJet®.
When wind velocity exceeds 5 m/sec, spraying operation
should not be performed.
AIR TEMPERATURE AND HUMIDITY
In ambient temperatures over 25°C/77°F with low relative
humidity, small droplets are especially prone to drift due
to the effects of evaporation. High temperature during the
spraying application may necessitate system changes,
such as nozzles that produce a coarser droplet or sus
-
pending spraying.
CROP PROTECTION CHEMICALS AND CARRIER VOLUMES
Before applying crop protection chemicals, the applica-
tor should read and follow all instructions provided by the
manufacturer. Since extremely low carrier volume usually
necessitates the use of small nozzle sizes, the drift poten
-
tial is increased. As high a carrier volume as practical is
recommended.
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