Why is 80 degrees to hot if its 90 out side?

[tripwire911]

ha ha ha love the disclaimer.

 

[bird mcbride]

The biggest reason the 80F nominal is known is because a bunch of BC growers came together and all agreed and came to the same conclusions. This is without added co2.
Some people don't care about what nature does, they are just looking for what gives the best results.
It's one of those general rule of thumb things.

 

[burnedout1958]

ok here is the deal . cloneing them trying to get roots the temp needs to be under 75 or no roots will form or the stem will rot . and veg . it van go as high as 110 f and the plants will grow I like the heat about 90 to 95 f under strong lights they grow super insane fast !. flower. first 5 weeks depending on your strand the temp can be up to 100 f. they will grow fast and happy. ok last 3 weeks of flower you need to keep the temps cooler once the buds start to get big. why ????? because if not mosttttttttt of the time if its hot the buds will be more loose not dense , some people smoke it and tell you its not as strong . this is from my experience . honestly if you can get the temps down around 75f stead late flower or cooler the quality really comes out. show quality stuff. any hotter and its may be ok but in the 90 to 100 quality will suffer greatly. BUTTTT it will grow. so guys grow how ever you want but if your a commercial grower . there is a shit load of completion out there. so you can only grow the best of be stuck with product you can sell and your out of business after your first grow . here in Michigan the quality of this has rose so sharply im very impressed . I see high time quality stuff being sold on the streets for 200 to 300 a zip . so if you flower hot good luck reselling it for over 100a zip the market is tuff ~!!!!! .......................................... legal note . all my posts are related to ghost chilly peppers . past or present posting and if its listed as other then its a total bull shit not true. or made up fiction .

have you considered getting aVPN internet service or a couple of , never mind. the chilly paragraph is hillarious, you really think IF the boys in blue tracked you down from here, they would believe that ? LMAO bro vpn and say what you gotta say with no fear. besides it's legal in 20 states so far or decriminalized

 

[Sativied]

Good post Johnny, I'd add rep to the like if I could.

http://wiki.answers.com/Q/How_will_temperature_affect_the_rate_of_photosynthesis#slide=1

It is preferable during flowering to have a night temperature drop of 10-20 degrees to stimulate flowering hormones and reduce stem elongation.

No, the opposite is true, a lower DIF, negative even, reduces stem elongation. This has been tested with both cannabis grows (article at hightimes if I remember correctly) and widely tested by scientists and experts in professional agriculture.

For example: http://www.plantphysiol.org/content/138/4/2344.full.pdf

Google 'DIF stem elongation' for plenty of other reliable sources. The point is, an increased difference (positive DIF) between day and night temp as you propose actually causes stem elongation. That unfortunately doesn't mean it reduces stem elongation at low or even zero DIF, but keeping it low DOES prevent the increased stem elongation caused by a too high DIF. Negative DIF (warmer at night than during the day) does reduce the normal stem elongation but is not recommended because it has other downsides.

You're correct about the CO2 though. The amount of CO2 also plays a large role, with more CO2 available (outside) the temps for optimal photosynthesis is much higher.

As with many things it differs per strain (and their origin) as well.

 

[burnedout1958]

Good post Johnny, I'd add rep to the like if I could.

http://wiki.answers.com/Q/How_will_temperature_affect_the_rate_of_photosynthesis#slide=1

No, the opposite is true, a lower DIF, negative even, reduces stem elongation. This has been tested with both cannabis grows (article at hightimes if I remember correctly) and widely tested by scientists and experts in professional agriculture.

For example: http://www.plantphysiol.org/content/138/4/2344.full.pdf

Google 'DIF stem elongation' for plenty of other reliable sources. The point is, an increased difference (positive DIF) between day and night temp as you propose actually causes stem elongation. That unfortunately doesn't mean it reduces stem elongation at low or even zero DIF, but keeping it low DOES prevent the increased stem elongation caused by a too high DIF. Negative DIF (warmer at night than during the day) does reduce the normal stem elongation but is not recommended because it has other downsides.

You're correct about the CO2 though. The amount of CO2 also plays a large role, with more CO2 available (outside) the temps for optimal photosynthesis is much higher.

As with many things it differs per strain (and their origin) as well.

so according to this my plants outside can handle up to 100 farenheit with the high Co2 here in Los Angeles. good to know.

Am I correct when I say the leafs curling on the edges is from to much heat transfer out of the leaf ?

 

[Sativied]

Well, the curve is more about the effect of CO2 on the optimal temp for optimal photosynthesis in general. Ymmv with cannabis and per strain. Many strains won't be able to handle 100 degrees very well.

Am I correct when I say the leafs curling on the edges is from too much heat transfer out of the leaf ?

The canoeing is commonly associated with too high temps, "too much heat transfer", I guess you could put it like that. When it's hot and dry it will transpire more water, if it cannot take up enough water and evaps more through its leaves then it can suck up then the water contents in the edges, higher in the plant (further from the roots) drops first.

 

[burnedout1958]

that's why I'm watering daily, just to keep them healthy, looks like they are making seeds for me now, I can see the sacks forming very happy camper

 

[Kimforeverandever]

"if the temps reach more than 85 degrees the plant dont grow at all...that is when u find a place with some shade"

lol ok i think hes joking... mine have been 80-98* and they have grown each day. they don't go over 84* now but it was when my venting was bad... but they still grew

Bit late but mines 85 and doing great just terpenes slowly developed