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kilimats

Root's lettuce always under water for hydroponic

kilimats
16 years ago

In this video explaining how hydroponic lettuce are cultivate, we see that the roots of the lettuce is always under water, how does the roots breath ?

http://www.dailymotion.com/relevance/search/hydroponie/video/x2eypv_comment-cest-fait-laitue-hydroponiq_tech

i am confused

ps: they don't use bubble air because the water is calm

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