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20 unigreen
6 SPRAYING
WARNING: the indications to follow when using chemical products are
indicated in paragraph 2.2.1.
6.1 DESCRIPTION OF THE DIFFUSERS
The distributor accessories of the AIRDROP range are equipped with
variable diffusers (FIG. 18) that let you direct the airflow (and as a
consequence the treatment) on the vegetation to treat, adapting to your
various needs.
According to the configuration of the accessory the diffusers have outlet
mouths with different shapes and sections, furthermore they are equipped
with a tap for turning the liquid on/off (R) so you can independently close one
or more diffusers in the case of scarce vegetation.
In the VENTAGLI version the diffuser is the fan itself.
6.1.1 NON-DRIP VALVE
There is a non-drip valve (V) on the distributors (FIG. 18) that limits and/stops
the mix dripping when the supply tap is closed. In any case we recommend
closing the delivery of the mix a few seconds before disconnecting the power
takeoff.
In versions with fans the valve is mounted immediately upstream of the dosing
taps (see paragraph 6.4.1)
6.2 DESCRIPTION OF THE MFC
®
NOZZLES
The Unigreen low-volume pneumatic atomization system uses MFC
®
nozzles (FIG. 19) consisting of a steel wire supported by Nylon deflector
vanes that also act as collectors for the liquid. The high-speed action of the
air atomises the film of liquid on the wire; in this there is a high air/water
surface area in contact and not just a single atomisation point, which means
a big advantage in terms of uniformity and homogeneity of the jet.
6.3 MIXTURE CONCENTRATION
As you may know, the pneumatic equipment are
used for more or less concentrated treatments.
To prepare the mixture, it is necessary to follow
the instructions on the chemical product label. As
a general rule, the product quantity to be sprayed
on the hectare is the same as normal-volume
treatments (a 20%-reduction is also possible);
the water volume is reduced a lot even up to 9
times = 10 concentrations.
We will try to clear this concept as regards
concentration with an example for the correct
use both of equipment and products.
Imagine that in order to protect a normal-volume
culture hectare you use 15 ml. of mixture. If the
product dose recommended by the expert
amounts to 100 g/hl. (normal-volume dose
indicated on the label which is always to be
followed), for 15 hl. You will use 1,5 kg. of prod-
ucts. If you decide to reduce the water quantity
per hectare at 500-300-150 litres (that is to say
concentrating 3-5-10 times), in these new water
volumes we must always use 1,5 kg. of product and 1,2 kg. if necessary (for
reductions up to 20%). As a consequence, the mixture concentration can
vary according to the water quantity that you wish to use.
From this example, you can notice a reduction of 4 fillings and 12 ml. of
water.
5 MISTBLOWER CALIBRATION
The tables on pages 25 to 28 make it possible to determine the delivery in
litres/hectares of the various equipment having the following initial data:
- position of the batching tap levers (Ventagli - Fans)
- calibrated plate CP (all others diffusors)
- used pressure;
- working speed (in km/h);
- working length (in meters).
FIG. 18
V
R
FIG. 19