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Plant
stand and seed densitiy
The
required plant stand is determined on the base of the 1000 seed
count weight and the germination in consideration of soil condition,
sowing method, sowing time, variety and the marketing goals.
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Plant
stand: Influence on yield and calibration
(Courtesy L´OIGNON, published by INVUFLEC,
Paris 76)
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Seed
quantity of 4, 5 and 6 kg/ hectare
plant stands of aprox. 100 - 140 plants/ m²
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Explanation:
The diagram shows that, within a determined scope, the plant stand
has only negligible influence on the yielded weight. However, there
is a considerable influence on the calibrations, which might affect
the profit.
Recommended
seed density
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| Agri-hybrids: |
4
- 5 units/ hectare |
|
desired
number of plants/ m² x 4 |
| Units
of seeds/ ha = |
------------------------------
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(germination
% minus 10 %) |
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In
practice and in tests a stand of 100 - 120 plants/ m² has proven
most successful as regards calibration and marketing.
If
the plants stand too close (much more than 120 plants/ m²),
they may mature too early without having achieved their typical
shape, and an increased infestation by leaf diseases as well as
a large percentage of smaller callibrations may be the consequence.
If there are too few plants (below 60 plants/ m²), this may
lead to retarded maturity, reduced yields and, in the Rijnsburger
varieties, an increased development of thick necks.
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Onions
