G
Guest
I had been growing the same phenotype of blockhead for a couple years under 18/6 veg cycle when I switched to 24/0,maybe thats it
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24/0 vs. 18/6
- Thread starter OGLicasto
- Start date
G
Guest
You can do either but I always do 18/6 for a couple of reasons.#1 To let the room cool down a little bit and save some energy. #2 Plants should get atleast a 4 hour resting period where they can exchange gasses properly.
S
SnakeBlisken
I run my veg at 24/0.If I change it to 18/6 will that cause them to go into flower?
no 18/6 wont cause flowering but ya may see preflowers an indicator of the plants sexSnakeBlisken said:
12-14 hr will cause flowering why most use 12/12 faster harvest
G
Guest
I use to use 24/0 during the winter months when it's cooler and switch to 18/6 during the hotter months. After seeing no real benefit in using 24/0 I only use 18/6 for veggin all year now.
Like someone else said I'm always way ahead with my vegging plants and waiting for space in the bloom room so super fast veg time doesn't really matter to me. Saving money on electricity by not running a 250W MH and and exhaust fan for 6 hours a day does.
Like someone else said I'm always way ahead with my vegging plants and waiting for space in the bloom room so super fast veg time doesn't really matter to me. Saving money on electricity by not running a 250W MH and and exhaust fan for 6 hours a day does.
XFieldofDreamsX
Member
I remembered reading about this somewhere so I dug up my "Indoor Marijuana Horticulture" by Jorge Cervantes. He says that mj only needs 18 for veg and that giving more could evoke male plants in seedlings and that the light usage diminishes. Besides if your running a HID then going 18/6 saves some money on power and heat isnt such a problem. But im sure everyone has there own opinion. Good luck, stay safe.
ballast
Member
well just a noob here but got pistils showing after only 3 nights of 12/12 now after 3 weeks of 20/4 veg and way better growth than my first grow on 24/0, just bagseed and maybe some typical newbie mistakes overcome but hey all 6 plants thriving so well i'll keep the dark hours til good reason not to. indeed veggies do most of their photosynthesis in the earlier part of the solar day and then wind down, likely not much dif with cannabis eh... trying to think like the plant, use what light is available soon as it comes until enough for the day, never know might turn cloudy later on
G
Guest
ballast,
you are the first person to mention 20/4 which is what i am currently running also...but i want to ask why more people dont do it....
you are the first person to mention 20/4 which is what i am currently running also...but i want to ask why more people dont do it....
D
dre86
hah I use 20/4 also on my current grow
edit: I'll explain why
I do believe that giving 24/0 light shedule gives a faster growth rate
But then again I need some time for my grow my room to cool
So I search the balance and that's 20/4 for me
edit: I'll explain why
I do believe that giving 24/0 light shedule gives a faster growth rate
But then again I need some time for my grow my room to cool
So I search the balance and that's 20/4 for me
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There is a chemical conversion process a plant goes thru in the dark cycle thats needed or desireable. This is why you wont notice much of any improvement or speed in veggin 24/0.
Besides that its not good for your hid ballasts to run 24hrs 7days a week. They'll work a lot longer if given a complete cooldown cycle at least once every 48-72 hrs.
Besides that its not good for your hid ballasts to run 24hrs 7days a week. They'll work a lot longer if given a complete cooldown cycle at least once every 48-72 hrs.
G
Guest
i understand that plants need rest, but i've never had my plants droop simply because of a 24/0 schedule. why would this cause a plant to droop?
Azra3l
Member
Hi,
It's not true that cannabis need a black period. In fact, cannabis is a C4 plant in which the dark step of the photosynthetic process is occuring in another compartiment of the cell unlike most of terrestrial plants which need a dark period to fix electrons...
But, there're several reason to get a 18/6 ot 16/8 cycle rather than a 24/0:
-the gain of net weight is not so different for a much less important electrical cost
from philip adam's book: black 24/0, violet 18/6, yellow 12/12, blue 5/19 and size = f(time)
-rooting is faster with a dark period probably something to do with the growth regulators imbalance
+++
It's not true that cannabis need a black period. In fact, cannabis is a C4 plant in which the dark step of the photosynthetic process is occuring in another compartiment of the cell unlike most of terrestrial plants which need a dark period to fix electrons...
But, there're several reason to get a 18/6 ot 16/8 cycle rather than a 24/0:
-the gain of net weight is not so different for a much less important electrical cost
from philip adam's book: black 24/0, violet 18/6, yellow 12/12, blue 5/19 and size = f(time)
-rooting is faster with a dark period probably something to do with the growth regulators imbalance
+++
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Cannabis plants are classified as ' short day plants ' that use the phytochrome system to sense day/night photoperiod. Plants use the dark cycle to convert phytochrome. Im pretty sure this process is desireable during the veg cycle too.
http://en.wikipedia.org/wiki/Short_day_plant
http://en.wikipedia.org/wiki/Phytochrome
Good example of how Eds advice should be taken with a grain of salt.
http://www.cannabisculture.com/articles/3127.html
A better start to understanding carbon fixation in plants.
http://en.wikipedia.org/wiki/Dark_reaction
http://en.wikipedia.org/wiki/Short_day_plant
http://en.wikipedia.org/wiki/Phytochrome
Good example of how Eds advice should be taken with a grain of salt.
http://www.cannabisculture.com/articles/3127.html
A better start to understanding carbon fixation in plants.
http://en.wikipedia.org/wiki/Dark_reaction
It seems like what needs to be done to solve this debate is get several people to do side by side identical grows of a very stable strain, and keep one on 18/6 and one on 24/0 and run a timelapse. Because as it generally seems to be with cannabis, since it lacks a lot of scientific study, we are getting very differing opinions, and no real proof really from either side, just anecdotal evidence. Until proper experimentation is done we're all just going to sit around and go back and forth with eachother on it and never really get anywhere.
Azra3l
Member
Hi,
I've updated my precedent post with a pic...
Verite,
Yeah, sorry I didn't understand that you were talking about the phytochrom response. IMHO, the main mechanism with phytochroms will be the triggering of the flowering by the augmentation of the PHYfr but on the other hand:
-we can assume that a plant which is given dark period during veg will attain sexual maturity faster than plants on a 24/0 cycle or will begin the flowering more rapidly after switching to 12/12. But this, we can only know with certitude if somebody try a side-by-side experiment...
-and there're the mechanisms involved with the phytochroms through the LRE and transduction via G protein (which control the production of anthocyanines and chloroplastes). Will plants under a 18/6 cycle exhibit more chloroplasts than a plant under 24/0 ? I would like to think that il will be the case but another time, it need a side by side experiment ...
For myself, I have been under 18/6 and 24/0 and I have keep on the 18/6 due to the pic I've posted . But the mechanisms with the phytochroms would be a good way to explore ...
Cheers
I've updated my precedent post with a pic...
Verite,
Yeah, sorry I didn't understand that you were talking about the phytochrom response. IMHO, the main mechanism with phytochroms will be the triggering of the flowering by the augmentation of the PHYfr but on the other hand:
-we can assume that a plant which is given dark period during veg will attain sexual maturity faster than plants on a 24/0 cycle or will begin the flowering more rapidly after switching to 12/12. But this, we can only know with certitude if somebody try a side-by-side experiment...
-and there're the mechanisms involved with the phytochroms through the LRE and transduction via G protein (which control the production of anthocyanines and chloroplastes). Will plants under a 18/6 cycle exhibit more chloroplasts than a plant under 24/0 ? I would like to think that il will be the case but another time, it need a side by side experiment ...
For myself, I have been under 18/6 and 24/0 and I have keep on the 18/6 due to the pic I've posted . But the mechanisms with the phytochroms would be a good way to explore ...
Cheers
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