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4. KEY CONCEPTS FOR SOWING
4.1 SOIL
A well-prepared soil significantly improves sowing quality. It
is not possible to obtain good results if the soil is in large
clods or the furrows are very uneven. Although the machines
can withstand harsh working conditions; the seeding will
not be good quality if the seedbed is not properly prepared.
4.2 SEED
It is essential to use quality, clean and, in the case of barley,
well-threshed seed.
4.3 DEPTH
Sowing depth influences tillering, plant vigour, frost and
drought resistance: the tillering node is always 1 to 2 cm be-
low the surface, regardless of the depth at which the seed is
buried.
Sowing deeper will not mean deeper roots. Only a few roots
grow from the lower part of the seed. The main mass origi-
nates at the tillering node almost at ground level.
Sowing at normal depth: 2 to 4 cm
Fig. 4.1
Fig. 4.1
Seed
Seed
Tillering node
Tillering node
• Thick stem, short rhizome
and good frost resistance.
• Multiple tillering with 3 to
6 tillers and many leaves,
between 6 and 10.
• Substantial rooting, 5 cm
wide and 10-12 cm deep.
• Fewer grains per square
metre of sowing yields
more ears.
Sowing slightly deeper: between 5 and 6 cm
Fig. 4.2
Fig. 4.2
Seed
Seed
Rhizome
Rhizome
Tillering
Tillering
node
node
• Thin stem, rhizome ex-
posed to frost.
• Delayed and poor tiller-
ing, 1 or no tillers and few
leaves, about 3 or 4.
• Regular rooting, 3 cm
wide and 5 cm deep.
• We need more grains per
square metre to obtain
the same number of ears
as in the first case.
Very deep sowing: 8 to 10 cm
Fig. 4.3
Fig. 4.3
Rhizome
Rhizome
Seed
Seed
Tillering
Tillering
node
node
• Very slender stem. No till-
ers and a single leaf.
• The grain's reserves are
depleted in a long rhi-
zome that can be easily
cut by frost.
• Poor rooting, 1 cm wide
and 3 cm deep.
• We need twice as many
grains per square metre
to obtain the same num-
ber of ears as in the first
case.
IMPORTANT:
SOWING DEPTH WITH STRAIGHT
COULTER UNITS IS NOT UNIFORM AS IT DE-
PENDS ON SOIL CONDITION AND REGULARITY.
IN VERY COLD AREAS, SUCCESSIVE FROSTS CAN
CAUSE THE TOP LAYER OF THE SOIL TO SWELL
AND BREAK UP, WITH THE DANGER OF LOOSEN-
ING THE INCIPIENT ROOTS OF THE PLANT AND
CAUSING ITS DEATH. IN THESE CASES, A SLIGHT-
LY DEEPER SOWING DEPTH MAY BE ADVISABLE
OR, IF POSSIBLE, A ROLLER SHOULD BE USED
TO COMPACT THE SOIL AND PROVIDE MORE
SHELTERED CONDITIONS FOR THE SEEDS.
WHEN THE MACHINE IS STARTED, NO SEEDS
ARE PLACED IN THE FURROWS DURING THE
FIRST METRE OF TRAVEL. HOWEVER, WHEN THE
MACHINE IS STOPPED, THE GRAINS THAT ARE
TRAVELLING DOWN THE PIPES WILL FALL OUT
AND PILE UP IN THE LAST METRE. KEEP THIS IN
MIND TO ENSURE A GOOD FINISH OF THE PASS.
ALWAYS WORK AT A UNIFORM SPEED. SUDDEN
CHANGES IN SPEED WILL CAUSE UNEVEN SEED
DISTRIBUTION.
THE RECOMMENDED SEEDING DEPTH WILL
VARY ACCORDING TO THE TYPE OF CROP AND
FARMERS ARE ADVISED TO SEEK PROFESSION-
AL ADVICE FROM TECHNICIANS OR SPECIAL-
ISTS IN THIS FIELD.
Summary of Contents for VESTA-2813 NS PLUS
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