http://homeharvest.com/carbondioxideenrichment.htmThe amount of carbon dioxide a plant requires to grow may vary from plant to plant, but tests show that most plants will stop growing when the CO2 level decreases below 150 ppm. Even at 220 ppm, a slow-down in plant growth is significantly noticeable. Dr. M. S. Cramer -- any bontinists have more data, only found this one reference?
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