CO2 and Heat Stress +Rep

TheDude0007

TheDude0007

Active Member
Hi Guys,

I recently had a post to determine if my plants are experiencing heat stress. Well thanks to everyone on this forum I was able to determine that it was my problem without a doubt. I was also able to reduce my temps a bit by improving ventelation.

Unfortunately I have suffered alot of damage and it has slowed my growing down as I now only have 9 plants left in my flower room (down from my capacity of 18 . My veg room is doing well and I am not moving those plants into my flower room yet. They must just grow huge under the cooler cfl's untill I get this sorted.

Ok my question;

I have been told that with CO2 the plants can take much higher temps. Well I have done quite a bit of research and found that making home made CO2 is very easy. On allot of the forums people advise to rather use the compressed bottle variety as this is more efective.

Well I wan't to hear from people using CO2 on what results they get and more importantly, anyone with high temps that use CO2.

Many thanks guys :joint::joint:
 
SCARHOLE

SCARHOLE

Well-Known Member
I get my lil sealed grow cab hotter when I use DIY yeast co2.
Couple of 2 liters with the sugar an yeast brew helps my ladies out.
Not sure how much it works I never did a side by side comparison with co2 vs with out.
The bottle with a emitter is deffinatly better, but if you got a little sealed cab DIY C02 2litters work.

I get my temps around 85 ish stead of 75 ish.

They transpire more water with higher temps, speeding up the plants metabolism.
With extra C02 , water and light they can perform alot more photosynthasis an growth.

When I Heat shocked my last grow it took em about 10 days befor they grew again. But it got over 105' in there. With C02 it got in the 90s some days with no ill effects.
Also check the temps at the top of the grow rm, they are usualy much higher than the rest. Use fans to even it out.
 
TheDude0007

TheDude0007

Active Member
So are you saying adding co2 increases temps or are you saying with co2 your plants can take higher temps?????
 
SCARHOLE

SCARHOLE

Well-Known Member
The co2 dosent increase heat by its self.

I alter ventilation an use a space heater to increase temps.

My cab is in the shed, witch is why its sealed to keep heat in during the winter.
Remember if the rm/cab isnt sealed pretty good the C02 is a waste. Its also heavier than air an will settle. Use a fan to evenly distribute it.
 
TheDude0007

TheDude0007

Active Member
SCARHOLE said:
The co2 dosent increase heat by its self.

I alter ventilation an use a space heater to increase temps.

My cab is in the shed, witch is why its sealed to keep heat in during the winter.
Remember if the rm/cab isnt sealed pretty good the C02 is a waste. Its also heavier than air an will settle. Use a fan to evenly distribute it.
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Look I get what you do. It is summer here and f'n hot so I need to reduce temps. But that is not what I am asking in this post. I have been told CO2 increases the plants tollerance to heat, do you find the same??????
 
zem

zem

Well-Known Member
the sugar yeast method is a lost effort in bigger grows. look it up in details, to get the right ppm of CO2 you need a silly amount of sugar. it could work for micro cfl grows like pc grows but for closets under HPS it's just not useful. get a CO2 meter and see for yourself how much this method raises ppm inside.
 
SCARHOLE

SCARHOLE

Well-Known Member
Growth slows at higher temps 85-95' f, but with optimum conditons and Co2 you can get better growth at those temps.
But I believe they will still be heat stressed about the same temps regardless of Co2 (100+' F).

If you give em enough water its amazing how much heat they can take, it sits over 100' most of the summer on my outdoor ladys.
But those temps will kill young ones quick.
 
TheDude0007

TheDude0007

Active Member
zem said:
the sugar yeast method is a lost effort in bigger grows. look it up in details, to get the right ppm of CO2 you need a silly amount of sugar. it could work for micro cfl grows like pc grows but for closets under HPS it's just not useful. get a CO2 meter and see for yourself how much this method raises ppm inside.
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Thanks dude, I thought as much. I am trialing the homemade co2 today. We shall see how that goes, but yes I am expecting not to notice too much of a dif. At the moment my growroom is smelling like a brewary. lol I am using brewers yeast.

Biggest problem of the afternoon was that my padlock on my growroom went up the creek. I had to go and buy a boltcutter to open it up. lmao.
 
AdamBlack760

AdamBlack760

Well-Known Member
Standard growing conditions typically include concentrations of CO2 at 300-500 ppm, temperatures between 65-80°F, and relatively low humidity (20-40% rH). Studies have shown optimal growth and yields at 90-95°F, 1,500 ppm CO2, 45-50% relative humidity, 7,500-10,000 lumens/square foot of light, and vigorous air movement both above and below the canopy. CO2 enrichment under 80°F, under 7500 lumens/sf, or above 50% humidity is not recommended because plants will not be conducting photosynthesis quickly enough to benefit from the enrichment
 
TheDude0007

TheDude0007

Active Member
ninjagaiden said:
wasted effort. Get a tank and regulator or a burner. Or get an AC unit.
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Simple to say it so plainly without any regard for my unique situation. AC unit costs to much to run, please note I am not in the USA were you have the world cheapest energy costs. Tank and regulator is fine but my question was really not what I should use.

I am asking if .... you know what never mind.
 
TheDude0007

TheDude0007

Active Member
AdamBlack760 said:
Standard growing conditions typically include concentrations of CO2 at 300-500 ppm, temperatures between 65-80°F, and relatively low humidity (20-40% rH). Studies have shown optimal growth and yields at 90-95°F, 1,500 ppm CO2, 45-50% relative humidity, 7,500-10,000 lumens/square foot of light, and vigorous air movement both above and below the canopy. CO2 enrichment under 80°F, under 7500 lumens/sf, or above 50% humidity is not recommended because plants will not be conducting photosynthesis quickly enough to benefit from the enrichment
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Very usefull info though I still have not had one person give me a straight answer on the only question I have.

If you add CO2 can the plant take more heat before it shows signs of heat stress???? <-------- this is all I want to know*********
 
MURK420

MURK420

Member
Hey bro Ill give you a tip. If your facing high heat you should eventually invest in inter-cooled hoods. Thats what I have and I run 4 crops a year. As far as co2 goes its worth it! you'll increase your yield by 100%. It's a very expensive initial set up. You'll need a tank=$200 + regulator=$125, and ppm monitor which can be up to $400 just to start out. after that its only 20 bucks per re-fill and I use two tanks per cycle. As far as using the co2 to regulate your heat problem I doubt it will make much of a difference. Co2 is a cold gas which is heavier then oxygen so it falls to the ground. If blown and circulated enough I'd think it drop the temp a little bit. I highly doubt it will give your plants more of a heat resistance though. Increase air circ. and make sure your hoods are far enough from your canopy is my only advice. Good luck budyy! I hope this helps
 
zem

zem

Well-Known Member
TheDude0007 said:
Very usefull info though I still have not had one person give me a straight answer on the only question I have.

If you add CO2 can the plant take more heat before it shows signs of heat stress???? <-------- this is all I want to know*********
Click to expand...
the answer to your question is YES. but this means you have to raise ppm of CO2 higher than 300ppm enviroment to 1500ppm but it is doubtful with this yeast method that you can raise it as much. get a CO2 meter or something to tell you ppm and see for yourself or else you are really battling a lost cause. if you already have heat when you have a proper exhaust, then you cannot seal room and use CO2, they can take higher temps but you cannot cook them you know? and without sealing room, you cannot apply CO2. usually CO2 is applied with A/C and aircooled hoods. you simply cannot battle high temps by sealing room and applying CO2
 
TheDude0007

TheDude0007

Active Member
zem said:
the answer to your question is YES. but this means you have to raise ppm of CO2 higher than 300ppm enviroment to 1500ppm but it is doubtful with this yeast method that you can raise it as much. get a CO2 meter or something to tell you ppm and see for yourself or else you are really battling a lost cause. if you already have heat when you have a proper exhaust, then you cannot seal room and use CO2, they can take higher temps but you cannot cook them you know? and without sealing room, you cannot apply CO2. usually CO2 is applied with A/C and aircooled hoods. you simply cannot battle high temps by sealing room and applying CO2
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Thanks for the info. Re the sealed room. A friend of mine had a grow setup in a basement, huge room, Botled C02 gave excelent results. That room was not sealed, but when aplying the CO2 the fans would shut down as it was all timed. The room was not exactly sealed though, but I get your point, it is better. All I am saying hydro grow, 20 X 600w HPS lights a bunch of extractors and fans used with bottled CO2 in a non sealed room, worked great.

For me though; I have used the homemade CO2 for about 3 days now and to me I can see a difference in leaf growth. Yes it is not as great as bottled CO2 but it does have a impact.

My room is not megga hot now that I have done the improvements as I mentioned before, but the plants in my flower room already had damage before I could sort the problem. I am just trying everything I can to try and help them. But as per normal Weed is so f'n sensative I can honestly say, they are f'd imo. I am now just trying to think if I should put some new girls in to flower, but I am to scared to move them from the cooler veg room at the moment. But if I don't I won't smoke again till June'11. Last year I did not have this problem. ##$@$%

:-)
 
TheDude0007

TheDude0007

Active Member
MURK420 said:
Hey bro Ill give you a tip. If your facing high heat you should eventually invest in inter-cooled hoods. Thats what I have and I run 4 crops a year. As far as co2 goes its worth it! you'll increase your yield by 100%. It's a very expensive initial set up. You'll need a tank=$200 + regulator=$125, and ppm monitor which can be up to $400 just to start out. after that its only 20 bucks per re-fill and I use two tanks per cycle. As far as using the co2 to regulate your heat problem I doubt it will make much of a difference. Co2 is a cold gas which is heavier then oxygen so it falls to the ground. If blown and circulated enough I'd think it drop the temp a little bit. I highly doubt it will give your plants more of a heat resistance though. Increase air circ. and make sure your hoods are far enough from your canopy is my only advice. Good luck budyy! I hope this helps
Click to expand...
That's a great tip man. Re my question; Thanks a million, I think you have answered it for me, CO2 would not do much for that.

Yes my problem is the heat and yes I think you are right, intercooled hood. I am almost there actually, the extractor is working and I have a long tube running from the extractor, you know the silver round ones :-) All I would need to do is to hook it up to my light somehow and take another piece and stick it to the opposite end, so it can suck the air through and past the bulb.

Have I got the right idea??? Never done this, but I have seen loads of pic's of cool tubes.

So my question to you then. What do I put in the middle around the tubular hps bulb?? Surely see through plastic would melt, glass?? or what would you say.

Many thanks.
 
zem

zem

Well-Known Member
TheDude0007 said:
Thanks for the info. Re the sealed room. A friend of mine had a grow setup in a basement, huge room, Botled C02 gave excelent results. That room was not sealed, but when aplying the CO2 the fans would shut down as it was all timed. The room was not exactly sealed though, but I get your point, it is better. All I am saying hydro grow, 20 X 600w HPS lights a bunch of extractors and fans used with bottled CO2 in a non sealed room, worked great.

For me though; I have used the homemade CO2 for about 3 days now and to me I can see a difference in leaf growth. Yes it is not as great as bottled CO2 but it does have a impact.

My room is not megga hot now that I have done the improvements as I mentioned before, but the plants in my flower room already had damage before I could sort the problem. I am just trying everything I can to try and help them. But as per normal Weed is so f'n sensative I can honestly say, they are f'd imo. I am now just trying to think if I should put some new girls in to flower, but I am to scared to move them from the cooler veg room at the moment. But if I don't I won't smoke again till June'11. Last year I did not have this problem. ##$@$%

:-)
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dude all i'm saying is that you should know what you are doing. dont mean to kill it or anything, just giving info. that 20x600w room was all dialed most probably that venting holes in that room were at the top, because CO2 is heavy and falls down onto the plants, with relays to shut fans and run CO2 with a controller and ppm reading, not a fan constantly pulling air out with yeast and sugar brewing next to it, cuz it doesnt help your plants are better because they are normally growing.
 
MURK420

MURK420

Member
I've heard of people putting their outtake fan/tube right next to the bulb to suck heat. I've also heard of some DIY cool tube stories where they used pyrex bread tubes bought on ebay for maybe 25 bucks. whats your set up look like? How many watts? closet size?
 
MURK420

MURK420

Member
oh and as far as supplementing co2 naturally bro be careful. Sugars, fermentation, and yeast attract the little buggies hardcore. just a tip. Ive heard dry ice could be the only clean natural way.
 
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