Sola ARES-2713, Starting Manual, Page: 19 / 40

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WORKING WIDTH / ROWS METRES TO COVER
400 62,5
450 55,6
500 50,0
600 41,7
700 35,7
2-
By means of a mark made previously on the tyre, count
the number of turns performed in the covered distance.
A good place whereby which to count could be the wheel’s mud
scraper.
3-
Next,
the seed drill in working position should cover that
distance.
By following these steps we can obtain the actual number of
turns performed in the seed dosing test.
By performing the test using this obtained number of turns,
we know the actual kilograms per hectare that will be dis-
tributed by the machine.
6.4.2 SEED DOSING ADJUSTMENTS
When using high quality certified seeds it is not enough to know
the weight in kilograms distributed by the machine, as the final
result of the harvest will depend on the number of plants which
eventually ripen.
Every plant requires a certain amount of land from which nutri-
ents will be absorbed. Therefore, both a low or an excessive plant
density can be detrimental. To determine how many kilograms per
hectare are to be sown, you should know the number of plants per
square metre that are going to be planted.
As a guidance, the recommended number of plants per square me-
tre when sowing wheat or barley in unirrigated land can be found
in following table:
AUTUMN SPRING
Premature sowing, 200 plants per m
2
Premature sowing, 310 plants per m
2
Late sowing: 265 plants per m
2
Late sowing: 445 plants per m
2
Please note that in spring there is less tillering so more seeds
should be sown.
MAQUINARIA AGRÍCOLA SOLÀ, S.L.
, REC-
OMMENDS THAT THE FARMER SEEKS PROFES-
SIONAL ADVICE ABOUT THIS SUBJECT FROM
A TECHNICAL SOWING CENTRE.
SEED DOSING SHOULD BE ADJUSTED TO EACH
TERRAIN, DEPENDING ON THE: TEXTURE, FER-
TILIZING LEVEL, PLUVIOMETER RESULTS AND
SOWING SEASON, GRAIN QUALITY, GERMI-
NATING AND TILLERING POWER, ETC.
It should be taken into account that a seed’s germinating
power is variable and dependant on multiple factors. It can
be experimentally calculated to be between 70% and 80%,
which is practically equivalent to multiplying the number of
grains to be sown by 1.43 or 1.25 respectively.
Next, we describe a practical method to determine the num-
ber of kilos per hectare to be distributed once we know how
many plants per square metre we want to obtain.
1-
Insert the “seed counter” into the seed sack to fill it.
2-
When taking the “seed counter” out, wipe the seed counter with
your hand to make sure that there is only one grain per slot (100
grains in total).
3-
Do the same 10 more times to obtain 1000 grains.
4-
Weigh these 1000 grains with the precision scales.
We call the result the OPERATIVE WEIGHT (g).
Once we know how many seeds per square metre we are
going to sow, we should adjust the following kilograms per
hectare in the dosing control:
KILOGRAMS PER HECTARE
=
(GRAINS PER M
2
X OPERATIVE WEIGHT) / 100