Interesting advice from DJ Short,on photoperiods..

Howdy Y'all,

I just came across this interesting little tidbit from DJ:


dj short says (about lighting )

" After many years of first-hand experience breeding herb indoors as well as outdoors, I am of the opinion that the two most influential factors involving phenotypic variation and expression among current indoor herb breeding projects are the photoperiod (hours of light per day) and the angle of light in relationship to the growing plant.

Specifically, I find the single most powerful influence to the Indica dominant phenotype is the traditional 18/6 veggie cycle and 12/12 flowering cycle. The 18/6 veggie and 12/12 flower cycle is an attempt, however poor, to mimic the Indica-producing photoperiod. It is my belief that this light cycle strongly influences for Indica phenotypic expression.

Sativa phenotype characteristics will manifest under a more equatorial photoperiod, closer to a 13/11 veggie cycle and an 11/13 flower cycle. This is the light timing range to use to elicit more Sativa dominant expression from your plants.

As for the exact photoperiod formula that I incorporate into my growing/breeding regime, this will presently remain a trade secret. My advice is to experiment with different photoperiods, keep good notes and pay attention. Avoid the 18/6 and 12/12 photoperiods, while tweaking the times a bit differently with each breeding cycle until more desirable results in the finished product and their offspring are noted. Heres a hint: work in half-hour increments or a little less, and good luck! "


I hope this gives y'all advanced growers,something to think about..I'm going to try DJ's idea out..cuz if he don't know what he's doing..nobody does !

Have a good one !

awesome info was that taken from how to grow exceptional cannabis by dj short

hello torog mate,
great info mate, i think i read it somewhere myself, i think if if you have the time decreasing the hours of light you give it before indusing flowering by half hour at a time will be far more natrual for the plant, and much less of a shock, it can only be better, i think its allways best to keep things as close to natrual as possible., take care mate and be luckey
........... peace happy ...........

I note how he never mentions 24/0 vegg.....

Good advice indeed.

I also note he says the "angle of the light."

THis can be translated I believe into the type of bulb....ie; HPS simulates sunlight in the late summer and fall, hence the angle and kelvin variations.

Great info...thanks TORAG.

just when i swithched the lights on 18/6....hello again guys....hey torog this is very useful info, really invaluable for this and for every grow......hardon i see your point....hello chappie....i wonder has anyone really tried what DJ shorty suggest about the veg stage for sativas? i am going to be growing them for my next grow :)



NGOS:)

no mean to barge in like an idiot as usual... but after reading this, am I to understand that I can determine the type of plant (sat/ind) i get by adjusting the lighting? I read somewhere that the lighting would help determine the sex of the plant..

Quote:

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Originally Posted by the happy chappie

hello torog mate,
great info mate, i think i read it somewhere myself, i think if if you have the time decreasing the hours of light you give it before indusing flowering by half hour at a time will be far more natrual for the plant, and much less of a shock, it can only be better, i think its allways best to keep things as close to natrual as possible., take care mate and be luckey
........... peace happy ...........

---

Howdy happy,

I agree,keeping enviromental conditions as close to natural,is a good thing..especially if it results in a higher brix factor.

I hope and pray,that you and your's,are well:) I've been wanting to warn you about my 'friend's' recent experience..seems the postal dudes paid him a visit and saw some beans that he had recieved from a foreign country,they opened the packs..but didn't take the beans..how weird is that ? Be careful....

Have a good one ....

Quote:

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Originally Posted by HARDDON

I note how he never mentions 24/0 vegg.....

Good advice indeed.

I also note he says the "angle of the light."

THis can be translated I believe into the type of bulb....ie; HPS simulates sunlight in the late summer and fall, hence the angle and kelvin variations.

Great info...thanks TORAG.

---

Howdy HARDDON,

Yup...I think that yer take is right..and yer welcome for the info..:)

Have a good one !

Quote:

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Originally Posted by sheist

no mean to barge in like an idiot as usual... but after reading this, am I to understand that I can determine the type of plant (sat/ind) i get by adjusting the lighting? I read somewhere that the lighting would help determine the sex of the plant..

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Howdy sheist,

Yer welcome to jump in at any time-and you are not an idiot,either..you ask an intelligent question..just wish that I could answer it for ya.

Have a good one !

hello again torog mate,
thanks for the advise mate , its very much appriciated, its possible here in the uk to legally walk into a head shop and purchase any type of beans mate with no probs. where just a little expensive here thats all, i was thinking of trying to get a licence myself mate but i aint sure of the possible concequences, maybe i should move to amsterdam and live freely as long as there is somewhere for me to charge my wheelchair up i will be happy lol hahahaha, thanks for your kind words mate, i am mending a little now and getting about in my garden well, i still cant get upstairs yet so them new seeds are gonna have to wait, but hey, my babys aint babys anymore, this sun has brought them on wonderfully, i will post some more pics in my thread in a little while to show you all, they look the best i have ever done, dont ask me how, they looked like they were on deaths door a short while ago, lol, take care mate and be luckey ............. peace ............ happy ...................

great thread torog... I've been wondering about this myself...it is just like in equatorial regions they are always within those tolerances 13/11...11/13 aren't they? and that would also say that you could grow all around 12/12 with the light periods getting shorter week by week, right?

Quote:

---

Originally Posted by the happy chappie

hello again torog mate,
thanks for the advise mate , its very much appriciated, its possible here in the uk to legally walk into a head shop and purchase any type of beans mate with no probs. where just a little expensive here thats all, i was thinking of trying to get a licence myself mate but i aint sure of the possible concequences, maybe i should move to amsterdam and live freely as long as there is somewhere for me to charge my wheelchair up i will be happy lol hahahaha, thanks for your kind words mate, i am mending a little now and getting about in my garden well, i still cant get upstairs yet so them new seeds are gonna have to wait, but hey, my babys aint babys anymore, this sun has brought them on wonderfully, i will post some more pics in my thread in a little while to show you all, they look the best i have ever done, dont ask me how, they looked like they were on deaths door a short while ago, lol, take care mate and be luckey ............. peace ............ happy ...................

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Howdy happy,

Well I'll be daggumed ! I didn't realize that about the beans,I wish that someday it could be like that here. Maybe that's why 'they' left my 'friends' beans,instead of taking them ? Maybe 'they' didn't realize the potential value of the beans,thinking that they were equivalent to trash..my 'friend',understands fully, their value. I'm so happy to hear that yer feeling alot better and that yer garden has made a great comeback..YaY ! I'm looking forward to seeing the latest pics..may God bless you and your's !

Have a good one !

hello torog mate,
i think latewood mentioned about the possabillity of growing weed from start to finish on a 12/12 cycle, i am pretty sure that this can be done with ruderrauls skunk, not sure how its spelt lol, but i know this grows freely in russia and has addapted its self to reproducing it self at this or very close to this cycle, i also no that breeders have been inbreeding this into some of there strains as a way to speed up there stock. as a plant i dont think its up to much for smoking but as fast plant its realy cool, i believe around 50/% will finish around the 12 hour of light cycle.
peace happy .................. ps

i once grew leda uno, i believe this had that strain inbred into it, as half my crop finished very very early, around the end of august. the rest come through around end of sept ...................................

There are people in our community that believe that you can grow start to finish 12/12
maybe not as much here at cdot, but I read arguments to that affect several times in the months of reading I did before attempting to grow again. Their argument is, that in equatorial regions, it is always close to 12/12. So, if you lived there and grew, that would be the light cycle that you had. I do believe a strain or 2 have been developed down there.

Quote:

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Originally Posted by Torog

Howdy Y'all,

I just came across this interesting little tidbit from DJ:


dj short says (about lighting )

" After many years of first-hand experience breeding herb indoors as well as outdoors, I am of the opinion that the two most influential factors involving phenotypic variation and expression among current indoor herb breeding projects are the photoperiod (hours of light per day) and the angle of light in relationship to the growing plant.

Specifically, I find the single most powerful influence to the Indica dominant phenotype is the traditional 18/6 veggie cycle and 12/12 flowering cycle. The 18/6 veggie and 12/12 flower cycle is an attempt, however poor, to mimic the Indica-producing photoperiod. It is my belief that this light cycle strongly influences for Indica phenotypic expression.

Sativa phenotype characteristics will manifest under a more equatorial photoperiod, closer to a 13/11 veggie cycle and an 11/13 flower cycle. This is the light timing range to use to elicit more Sativa dominant expression from your plants.

As for the exact photoperiod formula that I incorporate into my growing/breeding regime, this will presently remain a trade secret. My advice is to experiment with different photoperiods, keep good notes and pay attention. Avoid the 18/6 and 12/12 photoperiods, while tweaking the times a bit differently with each breeding cycle until more desirable results in the finished product and their offspring are noted. Heres a hint: work in half-hour increments or a little less, and good luck! "


I hope this gives y'all advanced growers,something to think about..I'm going to try DJ's idea out..cuz if he don't know what he's doing..nobody does !

Have a good one !

---

BTTT

How about 21/3 veggie
11/13 flower?

Hmmm, I start flowering with a 36hr. dark start, then 12/12, finish last 10 days with 10/14 for 7 and final 3 8/16

Angle of Light

Angle of light simply refers to the physical angle of light source the plant is dependent upon for growth. Perhaps the greatest difference between indoor and outdoor environments has to do with the angle of light received by the plant. This is also one of the greatest seasonal differences between the Sativa and Indica producing regions.

Outdoors, the main light source is the Sun, with minor influence coming from nearby reflective surfaces. As a plant grows taller and broader outdoors, that angle of light from the sun changes very little in relationship to the growing plant.

Seasonal changes in angle of light increase the further away from the equator one gets. At the equator there is the least amount of seasonal change in angle of light, only about 20°, whereas at the 45th parallel that change is as great as 45°. At the 45th latitude, the Summer Sun is high in the sky while during early Spring and late Fall the sunlight comes from much lower in the sky. The farther one goes from the equator, the greater the difference in seasonal changes regarding angle of light.

Indoors, the lights typically range from a few inches to several feet from the plant. As the plant grows taller, its physical relationship to the bulb's angle of light changes considerably. Most indoor grow rooms have relatively low ceilings, therefore, raising the bulbs may maintain a similar angle of light early on, but eventually the angle changes. An excerpt from the above cited work by D.J. Short as to lighting angles.

"The same differences may be noted among plants directly below the bulb and the plants off to the side of the room farther away from the bulb.

Circular light shuttles tend to emulate the arctic summer and create a confusing signal completely unknown to the equatorial Sativa. Straight-track overhead light shuttles are more conducive to inducing the Sativa phenotype."

Didn't copy it but that's from DJ Shorts above mentioned treatise on breeding tips.

Dude. 2005.