To: Brumar89 who wrote (10991 ) 3/30/2007 8:51:12 PM From: Brumar89 Respond to Didn't know pot growers bought CO2 and released it to make their plants grow bu they do: Growth rates can be increased dramatically if the CO2 level is near 700 ppm. 300 ppm (Outside Air) 700 ppm (Ideal) 2000 ppm (Plants Burn) 5000 ppm (Death) CO2 is cheaply produced by burning Natural Gas. However, heat and Carbon Monoxide must be vented to the outside air. CO2 can be obtained by buying or leasing cylinders from local welding supply houses. Beware! The DEA has asked the supply houses to provide lists of large CO2 users. If you are questioned, simply say "I have an old mig welder at the house and I want to try and patch up my (Lawnmower, car, trailer, etc.). If you find that you are making lots of trips to the supply house, complain that your "buddy" keeps leaving the cylinder valve open all night. This should provide a plausible excuse. You need 3 to 5 times more carbon dioxide in your grow room than is found outdoors. In nature, there are 300 (country) to 400 (city) carbon dioxide parts per million, but for optimum plant growth in controlled circumstances you want about 1500 carbon dioxide parts per million. For this you need additional supplements of carbon dioxide. Circulating air, even fresh air, or fanning the plant, does not increase the amount of carbon dioxide available for the plant. At best this will provide a constant 300-400 carbon dioxide parts per million.
