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How large a garden do you need if you are to survive on them producing enough oxygen in a closed chamber?

And which are the most effective plants?

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up vote 4 down vote accepted

According to this news article, in a NASA experiment one man survived for 15 days in a sealed chamber containing 30,000 small wheat plants. If you read the article you will find that this did not produce a completely balanced system - some excess oxygen had to be removed, and some extra CO2 had to be pumped in.

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