Parts per million of CO2

How much CO2 should I use in the growroom?

How many parts per million of C02 should one use in a grow room? How does one monitor the amount in the air?
Can there be too much?

E-Man,
Nova Scotia, Canada

The amount of CO2 the plants can use depends on the amount of light they are receiving. The higher the light intensity, the more CO2 they can use. At normal atmospheric levels (350-400 ppm) CO2 is usually the limiting factor in indoor gardens. As the amount of CO2 in the air increases photosynthesis and the growth rate rise in a linear ratio with the CO2 enrichment.

Usually gardens using around 30 watts per square foot can handle enrichment up to about 1,000 ppm. Increasing the amount beyond that level probably won't result in increased growth, since light, the energy powering photosynthesis, becomes the limiting factor.

At 60-100 watts per square foot the plants use can use 2,000 ppm CO2. Since the amount of light the plants use for energy increases they can use more CO2, which they use as an ingredient in the manufacturing of sugar.

Readers with grow questions (or answers) should send them to Ed at: Ask Ed, PMB 147, 530 Divisadero St., San Francisco, California 94117, USA. You can also email Ed at AskEd@cannabisculture.com, and send queries via his websites at www.ask-ed.net. All featured questions will be rewarded with a copy of Ed's new book, Best of Ask Ed: Your Marijuana Questions Answered. Sorry, Ed cannot send personal replies to your questions.

Advertisement

Advertisement

Related Articles

Ed Rosenthal
Jun 16 2006
Questions and Answers with the Godfather of Grass
Ed Rosenthal
Apr 13 2006
Questions and Answers with the Chief of Keef
Ed Rosenthal
Oct 26 2005
Is Peters 20-20-20 better than Miracle-Gro?

Advertisement

Advertisement

Advertisement