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co2 should I?
- Thread starter scoby
- Start date
It depends on your conditions. If you only got a small light in a closet, it may not be worth it. If you got a room full of 600's or 1000's, then it is worth it. If you have a sealed room then it can work. If your room is not sealed then it can be a waste. I stay between 600 and 900 PPM. I used to use 2,000 PPM but 600-900 did much better. Spurr has a thread on that somewhere here on IC. You can probably find it in my signature of links for new growers.
Like Snype said, you need a sealed room, but I'd use it for more production even in a closet grow if you can seal the bedroom. As far as side by sides go, adding CO2 is a long proven way to increase production. I use it at about the same level as Snype. I use a tank and regulator w/timer. You can calculate how much you need to dispense with http://www.hydrofarm.com/resources/co2calc.php
And good info here: http://www.hydrofarm.com/resources/articles/co2_enrichment.php
Good luck. -granger
And good info here: http://www.hydrofarm.com/resources/articles/co2_enrichment.php
Good luck. -granger
Here's another way to think about it, and this applies to all horticulture in general.
Plants have certain basic requirements: Light, Nutrition, Water and Atmosphere.
If you have a big lumen output, a proper nutrition regimen with proper pH to adsorb and
transport nutrients and good quality water applied at regular intervals, then the only
"limiting factor" becomes Atmosphere.
You will see the largest increase in yield and fruit quality when you add CO2 only when
Atmosphere is the limiting factor. You will only see a minor increase in yield and fruit
quality if you have not maximized the other 3 factors, probably 3-6 percent. But if you
maximize the other 3 factors, you could experience 10-15 percent yield increase with
noted increases in fruit quality.
Note that the word "Atmosphere" also includes relative humidity and fan oscillation.
Relative Humidity is important because it is a factor in stomata opening, and
fan oscillation is important because it builds larger branches which support larger fruits.
RH and fan oscillation should be optimized when adding supplemental CO2.
I find the subject of CO2 interesting. But I always defer to Spurr and associates on this
subject because believe it or not, not everything you read about CO2 is true. For example
the older books say that 1500 ppm is optimal. However, current research suggests that
lower levels are more effective, as mentioned in this thread and other CO2 threads.
10 years of kind regards from guineapig
Plants have certain basic requirements: Light, Nutrition, Water and Atmosphere.
If you have a big lumen output, a proper nutrition regimen with proper pH to adsorb and
transport nutrients and good quality water applied at regular intervals, then the only
"limiting factor" becomes Atmosphere.
You will see the largest increase in yield and fruit quality when you add CO2 only when
Atmosphere is the limiting factor. You will only see a minor increase in yield and fruit
quality if you have not maximized the other 3 factors, probably 3-6 percent. But if you
maximize the other 3 factors, you could experience 10-15 percent yield increase with
noted increases in fruit quality.
Note that the word "Atmosphere" also includes relative humidity and fan oscillation.
Relative Humidity is important because it is a factor in stomata opening, and
fan oscillation is important because it builds larger branches which support larger fruits.
RH and fan oscillation should be optimized when adding supplemental CO2.
I find the subject of CO2 interesting. But I always defer to Spurr and associates on this
subject because believe it or not, not everything you read about CO2 is true. For example
the older books say that 1500 ppm is optimal. However, current research suggests that
lower levels are more effective, as mentioned in this thread and other CO2 threads.
10 years of kind regards from guineapig 
Pepe le skunk
Member
Guinepig,
Can you be more specific about RH% and stomata opening.
ex. Live in Colorado and run a dehumidifier in basement. Very dry environment around 20%. How much change is necessary for stomata to open in this dry environment and CO2 to be effective? I am hooked up to a humidity/ fan controller. At least as you understand it?
Or anyone for that matter so I can learn.
Refilling the damn bottles every 2 weeks is not fun. And can get expensive. I always just set the flow at around .5 to replentish used up co2. Get about 3-4 weeks per bottle.
Can you be more specific about RH% and stomata opening.
ex. Live in Colorado and run a dehumidifier in basement. Very dry environment around 20%. How much change is necessary for stomata to open in this dry environment and CO2 to be effective? I am hooked up to a humidity/ fan controller. At least as you understand it?
Or anyone for that matter so I can learn.
Refilling the damn bottles every 2 weeks is not fun. And can get expensive. I always just set the flow at around .5 to replentish used up co2. Get about 3-4 weeks per bottle.
DinosaurCocks
Member
i am wondering the same thing, my room is at 23% humidity right now, i am not using a dehumidifier, it's just 23 degrees below zero outside right now and that kinda just sucks everything dry, so there isn't even much i can do about it, a humidifier running 24-7 only raises the humidity by around 10% and i don't like to use it because it makes my windows sweat.
co2 is worth it if everything else is dialed in. then you have to adapt to new environment and increased growth rates. I don't recommend c02 until you got some experience and have a baseline . then you can see the results for yourself. I have only used co2 with hid and in greenhouse ,so I don't know about floros, and led setups.
thanks for the input, my money is getting two more lamps and stand alone ac 14000btu and then Im gonna do it, titan atlas controller and a propane burner. Yes everything else is dialed in, I run 77 degrees lights on and 68 lights off, and the humidity is whatever I set it at. The room is already sealed with in room circulation
go for it . remember with increased grow rates, you might need to tweak the ferts a bit. anything off will show faster with co2. you also might wanna bump up the temps a bit. but that subject is researchable and debateable.
