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Some More CO2 Figuring

In my last post, in order to set
up a ballpark calculation on 
nightime CO2 concentration
increase from steady injection, I wrote:

> Making two simplifying arguable
>assumptions: 1) 100% delivery, 2) no
>depletion in darkness;

I really ought to have added a third assumption:
3) my plants are not a significant CO2 source at

I know all three are not good assumptions. Also
the first two, no CO2 out, to some extent balance 
the third, none in.

Anyway, is anyone able to give me a sense of how
much CO2 plants will produce at night? Perhaps as
a corralate of how much CO2 they use during the day.
Tim - Pittsburgh