madlingo

I'll have 5 plants vegging in a closet growspace
of 8 sq. ft. under a 400W MH.
I left the lamp on 24hrs and it heated up
from 72F no light to 90F w light. Is it too hot? And will the humidity be so much that I have to run an intake and exhaust? My closet doors aren't tight and on the top half have slits/vents like 3" long down 8 columns. Is that good enough ventilation? I want to create a C02 generator and if I run a ventilation sysytem the C02 will be flushed out immediately.

__________________
MaDLiNgO

bgetting

At the very least, you should have a fan in there blowing the air around. The hotter it is, the higher you want your humidity, to keep them from drying. Water in the air as some good buffering action too, that makes the platn respond to heat shock better (in my opinion). Anyway, at least a fan.
I am not sure what kind of CO2 generator you are thinking of, but most that run of combustion will make your garden even hotter. You would probably have to either have a tank, or use yeast. Cycle it, so the CO2 generator runs for whatever time it takes to get to whatever levels you want, then all is calm for an hour or two, then the fan turns on for a little while to cool it down and put fresh air in. Then it turns off and the CO2 generator goes again...
One other thing, when you raise the temp up to like 90, a higher CO2 level will help to ease that. The reactions in the plant are happening faster at a higher temp, so extra CO2 will be good.

madlingo

Thanx man. Im using a yeast setup to create C02. That's a good idea, I was thinking of running the fans on a timer for 5 minutes on, 10 minutes off with the CO2 going constantly because its not powered. Ive heard a jug with water and sugar and yeast with a rubber stopper and hose will create C02, is this true?

__________________
MaDLiNgO

bgetting

I used to research yeast, so I can tell you what they need, and you can decided what you want to do...

They need a carbon source (sugar, molasses, etc. - dextrose works best because the yeast can metabolize it without having to convert it to something else first.)

They also need a nitrogen source (somewhere to get amino acids) yeast extract is good for that.

After that, they are good. I would recommend brewer's yeast over baker's yeast, since it likes to make CO2. Put them in a sealed bucket, with either a brewing airlock (best) on top, or you can have a tube coming out and going in to a glass of water (or something along those lines) Works like a bong in reverse! anyway the bubbles coming out of the airlock or glass will be CO2.
Once it begins to subside, add more sugar, and they will be back in action. After a coupel weeks you want to empty it and redo it, because they get a little finicky when they grow over a certain density.

bgetting

Sorry man, I forgot to put a recipe for you:

10% Yeast Extract
20% Dextrose (or other sugar)
(10% peptone if you can get it... it is a lab reagent, containing 65% pancreatic digest of caseine and 35% yeast extract. Good stuff)
Put into water. This translates to below:

10 g yeast extract
20 g sugar
(10 g peptone)
mix into 800 mL water, then once it is dissolved, diluted to 1000 mL. This should then be sterilized by either using pressure cooker or an autoclave (if you use an autoclave, put the sugar into another conatiner with water, and autoclave it seperately, otherwise it will crystalize) Once sterile, mix all together (if nec.) and wait until it comes to room temp in a sterile covered container. then you can innoculate with yeast. Just pour the brewers yeast in, and put it in the garden.

The sterilization is to get rid of bacteria, which also love the media, and will compete with the yeast.

madlingo

I'll try that. Plus my girlfriend is a chemical tech student with access to such awesome stuff. I'm sure I can scoop up those items from her. Thanx.

__________________
MaDLiNgO