Do I need Co2?

[Rolling_Stoned]

Howdy folks
The grow I just started will utilize 1800w of lights for flowering, in a 4'x5' room. With this high wattage is Co2 necessary?

I've read that once you give your plants a certain amount of light, they reach a threshold, with out sufficient Co2 the light is just waisted. Without sufficient Co2 the plant can't utilize the photons for photosynthesis.

B.T.W. Recently HT mag. stated that it takes 10 photons to split 1 Co2 molecule, for the plat to utilize as energy does anyone know if this is true? Also, when they say use energy are they refuring to the creation of ATP?

 

[Haps]

Yes you need it, fortunately, the atmosphere on earth provides enough, for me and my gals anyway. Adding extra will help in some grows that meet the conditions, like temps. Last thing to add, if the rest is tuned in.
H

 

[Rolling_Stoned]

Thanks Haps,
So I do need to supplement Co2 for that quantity of light to be photosynthesized?

 

[Guest]

Like Haps said if your temps are over 85 you'll need CO2.

GCG

 

[Guest]

Last thing to add, if the rest is tuned in.

Totally agree. From what I understand and have seen you're looking at maybe a 15% improvement in yield for a totally dialed in space and still it'll help mostly in veg to accelerate growth. If my temps were over 85 I'd be more apt to look at improvements in ventilation which would be cheaper and less complicated than adding a CO2 system.

The grow I just started will utilize 1800w of lights for flowering, in a 4'x5' room. With this high wattage is Co2 necessary?

Not really. Sativa's or sativa dominant strains would really like that light concentration though. That amount of watts in that space is a bit overkill but yes CO2 would help. Maybe look at just removing some of those watts then no need to change ventilation or add CO2. It's always nice to have some backup equipment.

 

[Haps]

I run 2K, with no co2, and my grow is healthy. Adding co2 is not needed at all for any reason, except to increase yield, but it will only do this if you work it right. It is too much bullshit for me to hassle with, I run high airflow in my bloom, and that does not work with co2 addition very effectively. If I cut my airflow down to use co2, I will also get mold and mildew with the slightly larger buds.

Each grow is an equation, build your grow, get it working, then evaluate if it will be a good thing for you. And most of the stuff in ht is questionable at best - it is a tool to sell you shit you don't need - like all media is.
H

 

[Guest]

I run high airflow in my bloom

Same here and basically ditto the rest of the stuff you said.

I do have a friend who I've recommended he run his flower space as a closed system in the Winter as air flow is cut dramatically due to the incoming air being frigid. Air flow is about 1200 cfm in the Summer and Winter it's barely 300. He has too much dead space which works to his disadvantage in the Winter. That's even with a heater and putting all the ballasts into the flower space. In his case I truly believe he needs to got CO2 with an electronic ignition.

Anyway...every room is an equation and the formula is sometimes different but basically Hap's advice is very solid IMO/IME. I'm a big advocate of open systems.