co2 question

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Originally Posted by chrisdl805

On a side note I have a C02 question. I have read on some Ed rosenthal Q&A's that when using Co2 and you have 60-100 watt/sqft that you can and should be running 1500-2000ppm of co2. I have about 70w/sqft so I was wondering what everyone's thoughts on this are? I know a lot of people here say to match your co2 ppm with your nutrient ppm, but if Ed Rosenthol said it then it has to be correct, right?

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Here's a paragraph from one of Ed Rosenthal's growbooks:

To find out how much CO2 is needed to bring the growing area to the ideal
2000 PPM, multiply the cubic area of the growing room (length x width x
height) by .002. The total represents the number of square feet of gas
required to reach optimum CO2 range. For instance, a room 13' x 18' x 12'
contains 2808 cubic feet: 2808 x .002 equals 5.6 cubic feet of CO2 required.
The easiest way to supply the gas is to use a CO2 tank. All the equipment
can be built from parts available at a welding suspply store or purchased
totally assembled from many growing supply companies. Usually tanks come in
20 and 50 pound sizes, and can be bought or rented. A tank which holds 50
pounds has a gross weight of 170 pounds when filled.

A grow room of 500 cubic feet requires 1 cubic foot of CO2
A grow room of 1000 cubic feet requires 2 cubic feet of CO2
A grow room of 5000 cubic feet requires 10 cubic feet of CO2
A grow room of 10,000 cubic feet requires 20 cubic feet of CO2


I want to get a tank and emitter system going, but they can be pretty expensive to get set up. Also, like grey1223 stated, if growroom conditions aren't ideal (sealed room and vented on a timed schedule) then much of the CO2 that's produced is wasted before the plants ever have the chance to utilize it. If you're able to keep temperatures in check, then fermentation and methods generators (propane heaters) are a cheaper and still very effective way to go.