Day/Night Temperatures

Need to read a couple pages in to get to the good stuff.

I realize i didnt even address the question and i really dont know. I know a very small change in temp is good but no change, beats me.

the more temp swing you have the less food procesingt he plant can do and more risk of pathogens such as pm. never go below 70 degree/. you can run higher if running co2

If you can control the temp perfectly then having warmer nights than days will keep your plants compact but it does have a drawback after a few weeks your plants will get sick they do like it when there is a suttle shift from day to night with day time temp being warmer!

So this is a good technique for plant control but does have its drawbacks stress and narcosis will happen after a few weeks!

then its not the right way if only a few weeks cause health issues. that dont make sence to say its the right way, the right way is no issues id say

Uncle Ben said:

In Afghanistan, it may be a temp differential of 100F during the day, 50's at night....a 50F swing.

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right. and if these idiots had any common sense, they'd realize the entire INDICA strains all came from afgan/iran/iraq, etc...

thats whats being grown in america now, buds from a place with that type of temp swing.... theres a REASON we love those indicas.

try treating them like they are meant to be.

they arent from there or climatized for that anymore once we have them over here. if i took a kush from here and went to its root home and tried it wouldnt grow the same anymore cause we have climatized it to our needs here. that ytpe of heat/swing makes fluffy buds

I was not telling you to do it just giving the facts and its doubtfull you would run into hight problems with a indica in the first place!
Where in my post did I say it is the right way just providing info that is all do with it what ya want man people around here sure read between the lines!

lol...talk about reading between line...where di i say anything about hights??? i wasnt tryin to insult you dood. i maybe read that as it was ok to have wild temp swings. sory for the miss read then

Ah its ok just a little pissed at another member on here sorry for lashing out!

no worries., i get miss read alot to....lol

farmboss said:

right. and if these idiots had any common sense, they'd realize the entire INDICA strains all came from afgan/iran/iraq, etc...

thats whats being grown in america now, buds from a place with that type of temp swing.... theres a REASON we love those indicas.

try treating them like they are meant to be.

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Exactly, that's my approach no matter what the plant material is. You'll not change the genetic code in a plant just because you take it out of its natural environment and subject it to your whims.

Lot's of caveats to this stuff. Type of plant material aside, orchid, one of the sites quoted states:

"While the results showed that the CO2 absorption was largest at 20.DEG.C., growth rate of Phalaenopsis has been considered to have a peak at a considerably higher temperature than 20.DEG.C.. We thought that this was because of higher leaf expansion rate at higher temperature than at 20.DEG.C., resulting a higher CO2 absorption rate per plant. (author abst.)"

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IOW, do what I've been advising for decades - for the most amount of flower production grow your plants to have and maintain the most amount of foliage and roots you can. Check out the 4 cola plant, that's a lot of foliage!




UB

non of what i saw in a couple of them links had anything to do with the same family of plants. think most know a higher temp is best for co2 obsorbtion and they tell us lower. lower heat the stomata arent open as much so how can it ascimilate it better with a closed door.

Medi 1 said:

non of what i saw in a couple of them links had anything to do with the same family of plants. think most know a higher temp is best for co2 obsorbtion and they tell us lower. lower heat the stomata arent open as much so how can it ascimilate it better with a closed door.

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This link nails my arguments regarding dif. It discusses temp issues with dicots, which is the family cannabis falls under. A higher dif influences flower and fruit production.

http://www.crophouse.co.nz/files/Gr_E17_-_Temperature_control_for_crop_steering_-_view.pdf

my plants got 46 degrees last night.. Im running my 600w mh with its Glass Cover OFF to warm it up

Well, there is definately evidence that plants produce more, tightly spaced nodes and buds when there is less of a temperature change from day to night. In the science world a lot of the time when they are discussing genetics, or the subject of and subjects pertaining to genetics, they talk about genetics and environment equally affecting all life forms. Therefor, what your cannabis plant eventually becomes, or grows into, is determined half by genetics and have by the surrounding environment. That being said, you see how much we can really affect or control our plants with our environment. I have to disagree with you UB and others, IMHO, indica plants, as well as sativas, will produce tighter spacing between nodes and a higher bud to leaf ratio when there is less change in temperature. Try to take this next sentence with an open mind. We can not assume that just because these indicas are orginally from a place with such a drastic change in day to night temperature, that those are the most optimum conditions to grow them in. That is an assumption not based on any evidence with no way of being proved. You can only make your own conclusions from first hand experience, and from mine and others i believe that a smaller change in day and night temperatures will ultimately be benneficial to your cannabis plant. Just MO. Peace.

I am definately not against dropping temperatures and increasing day to night temperature change towards the end of the flower cycle. I have read that lower temps and decreased co2 can lead to better flavors (more terpintines?) and riping as well as the obvious opportunity of the production of different colors in your plant. Who doesnt like some nice deep reds and purples right?

Alex Kelly said:

I am definately not against dropping temperatures and increasing day to night temperature change towards the end of the flower cycle. I have read that lower temps and decreased co2 can lead to better flavors (more terpintines?) and riping as well as the obvious opportunity of the production of different colors in your plant. Who doesnt like some nice deep reds and purples right?

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I personally wouldn't want my plants to change color because of the temp because it could make it harder to diagnose issues. I think it happened with one of my first bagseed plants, halfway through flowering everything started going purple.

I think the only time, a very small dif is beneficial, is durning veg n preflower if strech wants to be limited. i dont think chlorosis should be affected, if a positive dif of 5 is kept, that should still be enough to keep strech to a minimun.

even with a large dif, it seems like extreme highs towards the end of the life cycle, cause nasty secondary stem growth
the last week, lowering co2, and temps, keeping a large dif, should help the flowers swell and not grow any extra stem when the flowers are already done forming anyway.
highs the last week will grow stem and not flowers. imo