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Environmental-compatibility Criteria for Lechler
Ag Agricultural Spray Nozzles
Integrated plant protection is a term used to describe
the application of physical, biological and chemical
processes with allowance for economical damage thresholds.
In that connection, ecologically viable techniques are
becoming increasingly important, with the loss-reducing
application of plant protectants enjoying a special
place value.
BBA and CEN:
Compliance with BBA and CEN standards regarding flow
rate tolerance and uniformity of distribution is instrumental
to the optimal selective use of plant protectants. The
flow rates of agricultural spray nozzles must remain
within +10% of the table values and within + 5% of their
own group average.
The maximum allowable coefficient of cross-distribution
variation within the stated range and corresponding
spray height is 7%.
These requirements derive in good part from the dependable
quality of Lechler nozzles.
Drift:
In the field of plant protection, the agent-laden droplets
that do not land on the target surface but are instead carried
off by the wind or thermal currents are referred as drift.
Such errant additions to surrounding areas can damage adjacent
crops, contaminate nearby waters, endanger man and animals,
ember other crops and adulterate the dosage applied to the
target crop.
Drift is caused by a number of equipment-specific
and meteorological factors.
- Droplet size
- Sprayer speed
- Spray height
- Wind velocity
- Relative temperature
- Ambient humidity
The use of Lechler Ag spray nozzles with technical
know-how and knowledge of the determining factors enable
good control of drift. Good modern practice includes:
- Drift reducing measures as very coarse-droplet
application through ID nozzles o Allowance for the direction
and velocity of the wind
- Limitation of plant protection measures via ID and
IDK nozzles to wind velocities of 5 m/s or less, AD
nozzles to 4 m/s or less, and LU nozzles to 3 m/s or
less
- Interruption of plant protection measures at ambient
temperatures above 25C and relative humidity levels
below 40%
- Maintenance of sprayer speeds between 6 and 8 km/h,
with ID nozzles up to 10 km/h for applying chemicals
- Adherence to the optimal spray height
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