increased yeild with photoperiod

[kings**t]

so could i throw my 6week old pants in 12/18 for the last two weeks and 48 for the last two days that will not hurt the plants even tho i had them on 12/12 for the last 6weeks

 

[Don Gin and Ton]

shouldnt do. but im guessing that as were all trying to mimic nature here id probably put the longer light period at the beginning of the plants cycle as if it were the longer days of spring.

 

[420pharms]

this is very interesting but i fear tampering with 12/12 i cant fuck up and stress plants into hermis this type of expirement is somthing i need to get a r&d tent for same place id flower males in for pollen harvest but way beyond my current skill level i will pay attention to this topic please keep posting

 

[Kcar]

plants need 12hr dark to keep budding. Not so with light. More hours of light will not stop budding.
the reason for 21:36/12 is because it's possible to program this into your digital timer, making it a no brainer...

 

[Brick Top]

The title to the thread is; "increased yeild with photoperiod." Is this only theory or is there some sort of actual scientific proof behind this?
　
Myself, I do not see where there could be an actual net gain.

 

[Don Gin and Ton]

why not? more dark time more growth?

 

[Green Cross]

why not? more dark time more growth?

No more energy more bud. Less light (energy) less bud

"The only photoperiod manipulation from years of experiments that offered discernible improvements was the following photoperiod adjustment made for 1 or 2 calendar weeks at the point of maximum flowering rate:"

This sounds scientific and definitive, but where's the proof. Anyone here want to ruin their crop experimenting...? lol

I've been thinking changing from 12/12 to 14 daylight may increase yeild. In theory that should work too.

 

[Don Gin and Ton]

i thought it was same light more dark as plants did most of the growing/ using the nutrients etc then?

 

[Rocho616]

Sorry if I seem rude but this is retarded... I mean seriously let me help you out; INSTEAD of trying shortcuts let it finish right and be ripe, if you want a faster flower i suggest you do you're research on aeroponics and nebulisers. But on a scientific note plants produce calyxes for and all that for the first 1-10 weeks slows down bad after week 8'ish....because at this point it has reached full maturity and whats happening is the trichs are turning amber and producing as much resin as possible....also plants produce resin in their dark period= more dark=more resin=better pot. CO2+Aero will give you some big crops if thats what you are after.

and as always diff. strains very. Again sorry if i seem rude but 80% of growing screw up's are because of shortcuts and impatience.

 

[Brick Top]

No more energy more bud. Less light (energy) less bud

That is the flaw in the whole idea. As I have said before during hours of light plants take in as much light and transform it into energy as they can. During hours of light the plants will multitask, they will allocate energy to all functions, including saving energy for use during hours of darkness.
　
During hours of darkness plants stop multitasking and allocate all their stored energy to just a few primary functions and growth and THC production are two such primary functions. Because of that those functions are allocated more energy during the hours of darkness than they get during hours of light so they grow faster and more efficient and they produce more THC faster and more efficiently.
　
There is also the loss of THC to factor in by increasing the amount of light plants get while still tricking them into believing they are in an regular flowering time cycle.
　
Light degrades THC, one primary function of THC is to work like a sunscreen for the trichome-head to protect it from the sun’s/grow light’s damaging rays. During hours of darkness when THC is produced more efficiently and at a faster rate the lost THC is replenished and then a small additional amount more is made so you have a slow gradual increase in THC levels by plant maturity.
　
But if you extend the hours of light when in the 12 hours of darkness what is the assurance that the plant will be able to make up for the additional amount of THC lost to light degradation and then on top of that still be able to produce the small additional amount of THC that should be produced?
　
By manipulating the time in such ways at what point might someone reach a point of diminishing returns and at what point might they go beyond just diminishing returns and end up with a net loss?

I've been thinking changing from 12/12 to 14 daylight may increase yeild. In theory that should work too.

Did I miss something in the above or did you just say that you are planning on going from a 12/12 flowering lighting cycle to a 14/10 lighting cycle where the hours of darkness would be less than 12 hours long and you say; "In theory that should work too" or did you mean you will be going to a 14/12 lighting cycle and do away with the whole 24 hour day concept?

 

[DrDank]

If plants "stop using light around 18hrs" then why didn't you put it on a 16/12 cycle... your math logic fails which means your scientific analysis of the grow was a fail too.

hehe, you mistake me for an actual doctor.

I've only tried the schedule listed in this thread, which has floated around for some time. By all means, if you have a more energy efficient schedule that's programmable on a 7-day timer, I'm willing to try it. The ChinaFarm digi only allows for a certain amount of on/offs.

 

[wowisuckatthis]

That is the flaw in the whole idea. As I have said before during hours of light plants take in as much light and transform it into energy as they can. During hours of light the plants will multitask, they will allocate energy to all functions, including saving energy for use during hours of darkness.
　
During hours of darkness plants stop multitasking and allocate all their stored energy to just a few primary functions and growth and THC production are two such primary functions. Because of that those functions are allocated more energy during the hours of darkness than they get during hours of light so they grow faster and more efficient and they produce more THC faster and more efficiently.
　
There is also the loss of THC to factor in by increasing the amount of light plants get while still tricking them into believing they are in an regular flowering time cycle.
　
Light degrades THC, one primary function of THC is to work like a sunscreen for the trichome-head to protect it from the sun’s/grow light’s damaging rays. During hours of darkness when THC is produced more efficiently and at a faster rate the lost THC is replenished and then a small additional amount more is made so you have a slow gradual increase in THC levels by plant maturity.
　
But if you extend the hours of light when in the 12 hours of darkness what is the assurance that the plant will be able to make up for the additional amount of THC lost to light degradation and then on top of that still be able to produce the small additional amount of THC that should be produced?
　
By manipulating the time in such ways at what point might someone reach a point of diminishing returns and at what point might they go beyond just diminishing returns and end up with a net loss?




Did I miss something in the above or did you just say that you are planning on going from a 12/12 flowering lighting cycle to a 14/10 lighting cycle where the hours of darkness would be less than 12 hours long and you say; "In theory that should work too" or did you mean you will be going to a 14/12 lighting cycle and do away with the whole 24 hour day concept?

nicely said brick! why screw with a good thing, earth has a 24 hour day leave it alone people.