Higher temps and THC

jijiandfarmgang

jijiandfarmgang

Well-Known Member
Hello,

I was talking about high temps in the grow room and started thinking.

Many growers like to utilize CO2 and also use higher temps, usually in the 80's. Also during summer months many growers just don't keep there room that cool.

I've read research papers from OLE MISS on growth rates of cannabis and temps in the lower 80's and I don't doubt that to an extent higher temps cause higher growth rates.

But does that hinder THC levels or CBD CBN terpenes etc? The only tidbit I read about this that Ed Rosenthal wrote about THC rapidly degrading above 85f (if I recall correctly). I was thinking with so many people testing there strains more info might be out on this.

- Jiji
 
Cpappa27

Cpappa27

Well-Known Member
My very first grow the tempos would get up into the high 90's and I got some good weight off the white widow but the there were less trichomes so not as frosty as the grow after that which was with the same strain but with LEDs and temps in the mid to high seventies. I didnt seem to get as good a yield off the plant with the lower temps but the quality was superb.
 
AzaruleGreen

AzaruleGreen

Member
I'v read humidity plays a huge role in trichome levels (less humidity means more trichomes) and typically humidity is higher in hot temperatures, so I wonder what would happen if you could maintain a 15 to 20 % humidity level in the higher temperatures. It is much harder to maintain lower humidity when in a hot environment versus a colder environment. if anyone does do this experiment you have to pay attention to the color of trichomes and see if they become more opaque (convert more THC into CBN) faster then they would in colder temperatures. The reason I mention this is because it is possible the temperature doesn't directly effect the THC levels but rather increases humidity and perhaps the plants sensitivity to humidity? Very good question though I hope people with more knowledge post on here with some more info.
 
ttystikk

ttystikk

Well-Known Member
AzaruleGreen said:
I'v read humidity plays a huge role in trichome levels (less humidity means more trichomes) and typically humidity is higher in hot temperatures, so I wonder what would happen if you could maintain a 15 to 20 % humidity level in the higher temperatures. It is much harder to maintain lower humidity when in a hot environment versus a colder environment. if anyone does do this experiment you have to pay attention to the color of trichomes and see if they become more opaque (convert more THC into CBN) faster then they would in colder temperatures. The reason I mention this is because it is possible the temperature doesn't directly effect the THC levels but rather increases humidity and perhaps the plants sensitivity to humidity? Very good question though I hope people with more knowledge post on here with some more info.
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I run higher humidity than standard practice all the time. My trichome production is a bit off from usual lately because of high summer temps. So RH is not a significant factor in trichome production, IME.
 
BobCajun

BobCajun

Well-Known Member
jijiandfarmgang said:
Hello,

I was talking about high temps in the grow room and started thinking.

Many growers like to utilize CO2 and also use higher temps, usually in the 80's. Also during summer months many growers just don't keep there room that cool.

I've read research papers from OLE MISS on growth rates of cannabis and temps in the lower 80's and I don't doubt that to an extent higher temps cause higher growth rates.

But does that hinder THC levels or CBD CBN terpenes etc? The only tidbit I read about this that Ed Rosenthal wrote about THC rapidly degrading above 85f (if I recall correctly). I was thinking with so many people testing there strains more info might be out on this.

- Jiji
Click to expand...
I recently found this article which indicates that temperature has a dramatic effect on THC content, like 3-4 times difference in some strains. This may be a big selling point for LED lighting, which otherwise seems to require close to the same wattage as HID to get similar light levels but costs a lot more. If it's going to make the difference between a 23° and a 30° chamber it may well be worth the price.
 
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jijiandfarmgang

jijiandfarmgang

Well-Known Member
BobCajun said:
I recently found this article which indicates that temperature has a dramatic effect on THC content, like 3-4 times difference in some strains. This may be a big selling point for LED lighting, which otherwise seems to require close to the same wattage as HID to get similar light levels but costs a lot more. If it's going to make the difference between a 23° and a 30° chamber it may well be worth the price.
Click to expand...
Great find. Exactly the kind of info I was looking for.

- Jiji
 
james murphy

james murphy

Well-Known Member
i prefer 85 during flower 35 humidity..and 67 at night w humidity roughly the same...i have lots of trichs. over 90 and 45 humidity i can tell quite a dif in thc production
 
qwizoking

qwizoking

Well-Known Member
But does that hinder THC levels or CBD CBN terpenes etc? The only tidbit I read about this that Ed Rosenthal wrote about THC rapidly degrading above 85f (if I recall correctly)


no... and honestly i would stop reading anything by him.
 
BobCajun

BobCajun

Well-Known Member
jijiandfarmgang said:
http://www.medicinalgenomics.com/wp-content/uploads/2011/12/Photosynthesis-and-Cannabinoid-Content.pdf
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Thanks for posting the link. I don't know what happened with my article link. It turned out as just the name of the article with http:// before it, for some reason. I must have copy/pasted the article name instead of the URL. Another interesting thing in the article was the graph showing that Cannabis can use up to about 120,000 lux before becomeing light saturated. That's full sunlight intensity if not higher. I read that sunlight is only about 98,000 lux.
 
jijiandfarmgang

jijiandfarmgang

Well-Known Member
BobCajun said:
Thanks for posting the link. I don't know what happened with my article link. It turned out as just the name of the article with http:// before it, for some reason. I must have copy/pasted the article name instead of the URL. Another interesting thing in the article was the graph showing that Cannabis can use up to about 120,000 lux before becomeing light saturated. That's full sunlight intensity if not higher. I read that sunlight is only about 98,000 lux.
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Did you read this article? It is a great one.

Light dependence of photosynthesis and water vaor exchange chracteristics in different high THC yeilding varieties of Cannabis sativa L.

- Jiji
 

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VTMi'kmaq

VTMi'kmaq

Well-Known Member
I have been super lazy, never checked temps at a diligent level. I read a shit ton is valid/pertinant info however, I STILL AINT LEAVING my hps/mh in unison set-up sorry led.
 
innerG

innerG

Well-Known Member
Damn, I don't run Co2 but mine stay at like 70-76. They start to freak out if the temp gets up near 80, i guess its just what they're used to.

I've always heard that "if it's comfortable for you, it's comfortable for the plants." Lol pretty scientific
 
testiclees

testiclees

Well-Known Member
BobCajun said:
I recently found this article which indicates that temperature has a dramatic effect on THC content, like 3-4 times difference in some strains. This may be a big selling point for LED lighting, which otherwise seems to require close to the same wattage as HID to get similar light levels but costs a lot more. If it's going to make the difference between a 23° and a 30° chamber it may well be worth the price.
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Nah on the wattage claim. Top quality led IS FAR MORE EFFICIENT THAN HID WATT FOR WATT.

Also not overly expensive if you build your own. RIU led diy is the leader in the cannabis world for latest LED tech and know how.
 
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