can i add co2 like this

[elito]

i cant run a closed system for now but a friend told me that if i streched a hose perforated above the plants and injected co2 for a few minutes wile the outake fans are off repeating this every 30 minutes would give me a nice boost in yeild,any advice much appreciated

 

[Lazyman]

No, because every time you vent, you're blowing that expensive gas right out the window. I would never recommend CO2 for someone running an air-cooled grow, it's just not efficient in the least. I wouldn't do it, anyway.

 

[elito]

No, because every time you vent, you're blowing that expensive gas right out the window. I would never recommend CO2 for someone running an air-cooled grow, it's just not efficient in the least. I wouldn't do it, anyway.

how much of it do the plants get to use for those few minutes,its not that expensive here 15 euros for 25kg

 

[Lazyman]

Well, assuming you were dumping in a fresh batch from a tank, to get it to 1500 ppm in an average bedroom, you'll use about 1 cubic foot of CO2 let's say.

Each pound of CO2 compressed gas contains approximately 8.7 cubic feet of CO gas at atmospheric pressure. So your roughly 50# tank (38# of co2) would last for 330 "on cycles." If you were to do say, 24 cycles per night, dumping that room every 30 minutes, your tank would be empty in 13.75 days. Not very good! In a sealed room it would last 4-6 times longer. The plants can use it as long as it's there, and though it wouldn't hurt, are you going to lug in two 50# cylinders a month to do it? If so, then go for it!

 

[elito]

Well, assuming you were dumping in a fresh batch from a tank, to get it to 1500 ppm in an average bedroom, you'll use about 1 cubic foot of CO2 let's say.

Each pound of CO2 compressed gas contains approximately 8.7 cubic feet of CO gas at atmospheric pressure. So your roughly 50# tank (38# of co2) would last for 330 "on cycles." If you were to do say, 24 cycles per night, dumping that room every 30 minutes, your tank would be empty in 13.75 days. Not very good! In a sealed room it would last 4-6 times longer. The plants can use it as long as it's there, and though it wouldn't hurt, are you going to lug in two 50# cylinders a month to do it? If so, then go for it!

your right,this lugging two bottles a month got me off im lazy too,so till i seal it no co2,thanks

 

[Lazyman]

No problem buddy, not trying to rain on your parade, just making sure you know what you're getting into before it bites you in the butt.

 

[rty007]

Maybe it is that i am not a native-speaker, but why would you want to use co2 at night? Or did you mean per day?

 

[SpasticGramps]

Maybe it is that i am not a native-speaker, but why would you want to use co2 at night? Or did you mean per day?

You are right. CO2 is only used during the day. You want your generator/tank turned off at night. CO2 is only used by plants when there is light for photosynthesis to take place.

To the OP. It really is best to have sealed up room. You are on the right path. Venting CO2 is not economically feasible IMO. In order to best use CO2 you really need to design your grow room around the fact you are using CO2. There are a lot of extra considerations to take into place when designing a CO2 vs conventional growroom.

 

[rty007]

what i mean was the semantics really per night as in per day can both of em be used? And yeah i know, that plants use o2 and extract co2 at night. but as you said even tho it improves your yield it is quite another ball game for co2 to be anywhere close to efficient. it also depends if it is a personal stash cabinet/small room grow or a commercial grow.

 

[sparkjumper]

Actually plants produce quite a bit of co2 during lights out but thats a different subject.There a major point being missed here that makes grows that vent occasaionally co2 non-friendly.If you have 1500PPM co2 for say 1/2 to 1 hr then you vent and it drops down to 7 or 8 hundred.You know what you've accomplished?Absolutely zilch.It takes time people disagree on how much time but it takes IMO hours and hours of a steady 1500PPM with no more than a 200PPM fluctuation either way.When you go to vent you are defeating the purpose.Look what you want is 1500PPM for 12 hours straight with like I said no fluctuations exceeding 200PPM either way.There is a reason the cap kicks on 50 below set point and kicks off 50 above setpoint.This was the floctuation never exceeds 200-250PPM.