tripwire911
New Member
ha ha ha love the disclaimer.
Why is 80 degrees to hot if its 90 out side?
- Thread starter imthemedic
- Start date
bird mcbride
Well-Known Member
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.
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
Active Member
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
Well-Known Member
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
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.
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.
burnedout1958
Active Member
so according to this my plants outside can handle up to 100 farenheit with the high Co2 here in Los Angeles. good to know.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.
Am I correct when I say the leafs curling on the edges is from to much heat transfer out of the leaf ?
Sativied
Well-Known Member
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.
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
Active Member
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
Member
Bit late but mines 85 and doing great just terpenes slowly developed