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The Truth About Photoperiods!

Ca++

Well-known member
And this on flowering at photoperiods longer than 12/12.
That study is quite good. They don't fully recognise it, but they show the slower transition, leads to less rushed plants. That can still devote some time to getting bigger. It's seen in the plant spacing, the plant size, the slow response times, and reported puzzlement over how the dli increase alone, can't explain the bigger yield.
It might of been nice if they kept the 13h plants going, until they showed as many brown hairs as the 12h did at chop. However, it's very clear what is going on there. It's basically bigger plants, that really wanted to go a bit longer.

This is useful if your veg time can be shortened, and those days given to bloom. Bloom using less power than veg. Rooms not full enough, can also be stretched out a bit further. When plants that are so stocky that lots of excess bottoms get chucked away, then spending more time in the elongation stage can fill spaces without growing so much waste.

There is a useful tool here, for those that can utilise it. It's not free weed for everybody though.
 

Verdant Whisperer

Well-known member
That study is quite good. They don't fully recognise it, but they show the slower transition, leads to less rushed plants. That can still devote some time to getting bigger. It's seen in the plant spacing, the plant size, the slow response times, and reported puzzlement over how the dli increase alone, can't explain the bigger yield.
It might of been nice if they kept the 13h plants going, until they showed as many brown hairs as the 12h did at chop. However, it's very clear what is going on there. It's basically bigger plants, that really wanted to go a bit longer.

This is useful if your veg time can be shortened, and those days given to bloom. Bloom using less power than veg. Rooms not full enough, can also be stretched out a bit further. When plants that are so stocky that lots of excess bottoms get chucked away, then spending more time in the elongation stage can fill spaces without growing so much waste.

There is a useful tool here, for those that can utilise it. It's not free weed for everybody though.
Interesting study you can see the buds that finished in 13 hours didnt properly mature, since there used to 12 hours to finish these lines, same thing happens in landraces my friends jarilla de sinaloa he count finish in 12/12 he had to go to 13/11 thn 14/10 to make it finish nice indoors because naturally in that region around the time of year that landrace finishes its around 10 hours of sunlight a bit more.. same concept you grow a Congolese from equator if you finish it in light shorter than 12 hours it will mature too fast and loose size and flowering time. Great find, thankyou for the share. this could be a good method for farmers farming CBG. use increased photoperiods in flowering.
 

Mate Dave

Propagator
ICMag Donor
Veteran
I use the natural photoperiod to my advantage.

I can germinate seeds in February @ 36N place them outside. Regular and Autoflowering genotypes.

Auto varieties can be sown every month then up until September.

Regular varieties I have experience with when planted on the same timeframe shifted into vegetative mode same as the Auto Genotypes, as the days get longer and longer plants put more energy into vegetative growth. Starting them early provided insight into the sex characteristics of the young plants, thus enabling a grouping of them into (M) and (MF) Mostly Females. I had actually done this before obtaining any results back from the testing facility at much less expense out in the middle of nowhere.

The regular stock plants showed signs of sex early on but it doesn't trigger full flowering differentiation, I feel due to the plants internal receptors signalling to say ("Nope not yet") by the end of March I had seen the full on Ladyboys. Plant numbers reduced. Ones that were believed to be Female were put into planters, the ones believed to be male, cuttings were taken to induce photoperiod responses and test them out for sexual stability.

As the season progressed all the plants naturally triggered into flowering at various stages, a second round of culling undesirable specimens was done. What was left out of that process of elimination produced seedless crops.

The first lot of Auto's came down at the end of June producing cannabinoids in the best weather period where there is no water pressure. This was favourable, having to tend to plants that need training/ support, are awkward harvesting, and consequently require repeat/frequent trips to the location..

I'd not had experience of rain on cannabis and how best to cultivate and spread plants to help them dry and clean them up..

The fastest and the fastest long flowering would be my 2 go to precursors for photosensitivity in plants..
 
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Verdant Whisperer

Well-known member
yes of course thats what they are..”early photos"

but..there are also later true @24 hrs/on autos..

which are still auto.

semi auto..nah..its like being semi pregnant..you are or you aren't
One thing i want to mention is photoperiod and autoflowers are a term we use to identify the plants, but you can breed a autoflower to respond to photoperiod and you can breed a photoperiod to autoflower if you understand the mechanics and work it for enough generations. I can take a ruderalis autoflower and breed many generations to increase its auxin and cytokinin levels, and it will take longer to flower. it may take 50 generations or 100 to change completely but that is how it originally happened in nature. generation after generation the phenotypes with the strongest hormonal profile pass on their genetics and over time shifts happen.
 

RingtailCanyon

Well-known member
It was a study that flowered cannabis strains in 13 hours and 12 hours they found the 13 hour flowering yielded more biomass. but at the sametime i bet if they compared profiles, they would find the 13 hour finishr would have more CBG and precursors i assume than the 12 hour.
They also found that cannabinoid level was equal or higher in the 13on11off
 

Verdant Whisperer

Well-known member
It takes longer for the 13on11off to mature. It looks like they harvested 12/12 and 13/11 at the same time.
I agree, thats the point i was initially trying to make
They also found that cannabinoid level was equal or higher in the 13on11off
Yes they stated that but also the cannabinoid levels are interesting higher in the 13 but the cbg on one strain was 50% more and 25% more on the other so they had alot more cbg than the 12 hour finishers. in my studies the plants that take longer to mature have slower more balanced growth and have more energy to provide for secondary metabolites like cannabinoids and terpenes. having it flower in extended light cycle will increase the plants lifespan requires a need for more cytokinins in the plant to extend its growth cycle, cytokinins are responsible for resin mostly so the longer the cycle that plant has the more cytokinins to extend its lifespan which in turn creates more resinous buds, its more because this strain is ment to flower in 12/12 based on its history of 20+ years of flowring at 12/12 and whehn it switched to 13 hours the plant will create more cytokinins to extend its lifecycle.
 

Verdant Whisperer

Well-known member
The way strains generally work if i have a line and breed opposite dirctions, the line i breed for biomass will make 2kg of buds but only 5% the other line will make 500g of bud at 20% oil content, but when extracted there the same amount of oil, they will take the same amount of time to grow, so if you want energetic highs go for the 2kg plants extraxt if you want heavier high for 500g plants oil. the energy of the plant is expressed the lighter terpenes favor the taller plant the heavier terpenes favor the smaller plant closer to the ground.
 

Verdant Whisperer

Well-known member
Cbg is the precursor to THC and CbD. If they are harvested before full maturity it makes since CBGa levels would be higher.
Its interesting thcv increased that shows me the plant used the thcv to help regulate its metabolism and growth. that could be important for high thcv and cbg strains manipulating photoperiods. same reason alot of desert plants are high in thcv, they need to regulate their growth.
 

Mate Dave

Propagator
ICMag Donor
Veteran
Cannabis is divergent as we know.

The scenario is: A new variety come to the Appalachia with trade and migration, it hits the gene pool, it segregated it, consequently wanted genes are kept, unwanted are rouged out over many many generations by natural selection, survival of the fittest..

In my head i'm thinking an indigenous Pakistani variety has 2 morphology's in plant structure a lot of intersex traits but flower and vegetative architecture is almost true to type so to speak. It moves along a lot faster than equatorial types and although an annual, natural selection between generations would still be viable with faster varieties being more ephemeral. What the population holds as far as the top hormone concentrations and how individual plants differ is negligible.

This species then pairs up with something in a real life F1 open pollination, new gene combinations arise there is a population shift..

Heterosis is to the forefront of gene expressions over-dominance is witnessed.

Is this from gene combinations or the influx of new hormones ratios in the new population, will they segregate into 3 new morphological distinct types from the 25%25% 50% or any recombination of alleles.

 
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RingtailCanyon

Well-known member
The way strains generally work if i have a line and breed opposite dirctions, the line i breed for biomass will make 2kg of buds but only 5% the other line will make 500g of bud at 20% oil content, but when extracted there the same amount of oil, they will take the same amount of time to grow, so if you want energetic highs go for the 2kg plants extraxt if you want heavier high for 500g plants oil. the energy of the plant is expressed the lighter terpenes favor the taller plant the heavier terpenes favor the smaller plant closer to the ground.
I’m not totally following you on this post^
Simply put you can have more biomass and also higher concentrations of thc(and other cannabinoids) by changing your light schedule from 12 on-12 off to 13 on-11off.
And if you want to increase cannabinoid concentrations even more… then do a strong drought before harvest.
 

Verdant Whisperer

Well-known member
Interesting Study, I can see the plants gibberalins inceased in are feminene plants and the decrease was in masculine plants. the triangles represent apical domiance female profile show apical dominance in the top where male show it in the bottle the difference between carrot and cypress tree for example.
1736867544080.png
 

Verdant Whisperer

Well-known member
I’m not totally following you on this post^
Simply put you can have more biomass and also higher concentrations of thc(and other cannabinoids) by changing your light schedule from 12 on-12 off to 13 on-11off.
And if you want to increase cannabinoid concentrations even more… then do a strong drought before harvest.
you will increase cannabinoids on a strain that is use to flowering in 12/12 by extending its lifecycle its blueprints/preset profile is made to flower in 12/12 so when the plant has more light it extends its flowering phase putting more emphasis on slower growth. slower growth = higher oil production/more density the same way when you drought stress the plant your slowing its growth and all its energy is going into preservation.
 
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