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How low of co2 ppm during night periods can plants handle?

Discussion in 'General Marijuana Growing' started by chewberto, Dec 2, 2012.

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    chewberto

    chewberto Well-Known Member

    I am wondering does there need to be a certain amount of co2 in the air while the plants are in the dark periods since they don't use any? does the air need to be exchanged if i have a dehumidifier?
     
    chewberto, Dec 2, 2012
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