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The
onion plant requires a constant water supply. Usually the branched
root spreads at most to a depth of 60 cm, correpondingly the roots
of young plants are even more flat. So irrigation systems with sufficient
capacity are absolutely recommendable. Rain cannons have well-know
disadvantages like large drops and high impact velocity with the
corresponding consequences such as accumulation of mud and damage
of the leafage.
More
recommendable are circular sprinkler systems, ideally in a net-like
arrangement (as they are commonly used in Austria). As in all populations,
the following measures should be considered: if possible, use of
warm water, irrigation in the early morning to avoid temperature
shocks.
In
general, two doses of 20 - 30 mm are sufficient for onions. For
autumn sown onions a balanced water supply is especially important
from August to September when they sprout.
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Onions
