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6.3 FACTORS THAT AFFECT SEED
QUALITY
The following adjustments affect directly on the quality
of the seed dosing:
1.
The selector’s position in relation to the disc’s holes. It is important
to adjust the selector’s position depending on the type of seed
to be distributed (see section 6.3.1. ADJUSTING THE SELECTOR).
2.
The seed ejector’s position in relation to the disc’s holes. In order
to achieve a better seed dosing, the metering box PROSEM
is provided with a seed ejector slide (see 6.3.2 ADJUSTING THE
SEED EJECTOR).
3.
The suction power needs to be adjusted to the weight of the
seeds to be planted (see section 6.4 SUCTION SYSTEM – FAN).
4.
Distributor seed inlet: the opening must be adjusted
according to the type of seed (see section 6.3.3
DISTRIBUTOR SEED INLET).
5.
Enough pressure must be delivered to the sowing units
to ensure optimal stability and prevent any jolting during
work (see section 6.8 UNIT PRESSURE ON THE GROUND).
6.
Check for wear on the distributor's components, especially
the runners, the ejector and other plastic components
(Fig. 6.13 and 6.14). Make sure that the seed disc is not
worn or dented (Fig 6.15). Make sure that the seed drop
tube is in a perfect condition.
7.
Conditions and the condition of the ground.
8.
The seeds being used must be dry and regular in shape
and size.
9.
For even and precise sowing, we recommend working
at low speeds.
Fig. 6.13
Fig. 6.13
Fig. 6.14
Fig. 6.14
Fig. 6.15
Fig. 6.15
6.3.1 ADJUSTING THE SELECTOR
The selector’s lever can be adjusted from 0 to 10. When
the lever is placed at a higher number, the selector is being
moved away from the hole and, therefore, the suction power
is increased. This causes a tendency towards the emergence
of doubles. On the other side, when the lever is placed
at a lower number, the selector is being moved closer to the
hole and, therefore, the suction power is reduced. This causes
a tendency towards the lack of seeds in the disc’s hole.
Recommended selector’s positions depending on the type
of seed to be planted using
standard seed discs
.
TYPE OF SEED
SELECTOR VALUE
MINIMUM
MAXIMUM
Sorghum
3.1
3.5
Sunflower
3.0
4.5
Non-pelleted beet
2.6
3.4
Rape
2.8
3.6
Corn
3.5
4.5
Baby corn
3.0
4.0
Soya / peas
4.0
6.0
Pelleted beet
3.1
4.0
Cotton
3.0
4.5
Beans
4.6
5.4
Chickpeas
4.5
7.5
Broad beans*
10.0
10.0
(*) If this is not sufficient, remove the selector
THE SELECTOR’S POSITIONS INDICATED
ABOVE ARE APROXIMATIVE; IT IS ESSENTIAL
TO PERFORM TESTS AT THE BEGINNING AND
DURING THE SOWING SEASON.
To check that the selector’s position is the right one, follow
these steps:
1.
Raise the machine from the ground.
2.
Use the FAN to pressurize the pneumatic system until the
pressure is appropriate (see section 6.4 SUCTION SYSTEM – FAN).