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<pre>Jon
You're right, its not an easy subject, so for what its worth….

For a variety of reasons I've elected to not irrigate my (young) trees
however as it has not rained for most of this year I have hand watered a
couple of times, 20 litres each tree each time. It’s a laborious
process but its only for the short term. If you are going to irrigate
then infrequent deep watering cycles are the preferred option to
encourage root growth.

If you look at the AOA awards, best oil, 'unknown old grove' (sans
irrigation I'll bet)

Next year the topic will be drainage..

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