SCIENCE FREAK NEEDED: flip light schedule to 24 on last 7 days flower for more thc ?

[NdefusableChrnc]

is this scientifically true ?

during the last several days, having the lights on 24.0 is supposed to increase thc and finishing as 7 days isnt enough time (esp the last days before cut) for any negative effects to happen to the buds

 

[texasluv]

I'm in for the answer to this question. I've heard so many different things about light cycles during the last few weeks of bloom.

I've hear that reducing the amount of daylight gradually from 12/12 to 11/13 triggers the plant to stack on some extra weight because it thinks winter is coming.

I've also heard that the lights should be off completely 24 to 48 hours before harvest to increase THC levels.

Last but not least, I've also heard the same thing you posted about. I'd really like someone to come in here and clear this all up.

 

[FarmerJoe]

My thoughts: I think that this late in flower, whatever you do, does not really change the end product.
Do what works for you.

 

[NdefusableChrnc]

yes, how would this work seeing that at the same time light happens to degrade thc, which im assuming it does even when the plant is still whole

just to clarify.. thc/cannabinoids production: is more/less produced during the light or dark cycle ?

 

[relief]

is this scientifically true ?

during the last several days, having the lights on 24.0 is supposed to increase thc and finishing as 7 days isnt enough time (esp the last days before cut) for any negative effects to happen to the buds

Nope the exact opposite is needed. About 2 to 3 days of pure darkness, then harvest.

 

[Guest]

during the last several days, having the lights on 24.0 is supposed to increase thc and finishing as 7 days isnt enough time (esp the last days before cut) for any negative effects to happen to the buds

Where the hell did you get this idea from and have ther EVER grown a plant?

Was it Cannabis? ?



so much for "higher" education.

 

[Jack Crevalle]

and I thought I had heard it all...what's next? Flush with pee so that the hairs turn yellow? WTF!@

 

[Guest]

Some comercial growers do this to up production, It actually makes the plant allitle less potent and less smooth, as it is trying to collect what little N is left to revegg. Slips

 

[Jack Crevalle]

I doubt it will make any diference and any longer would simply make more veg growth like leaves etc...please explain how several days of light can make a bud less potent? I doubt it, do the tricks melt? It sounds very shady, and someone told him that it would increase thC? hmmm

 

[NdefusableChrnc]

thanks. read some bunk shit.

 

[foaf]

you can be sure that no one has done any scientific studies, and you can also be pretty sure that it wouldnt make much difference.

stick to standard methods. standard methods produce wonderful pot, its hard to beat wonderful.

 

[Storm Crow]

Hey, Jack,

Hey, Jack,

The problem is that THC CAN be degraded by light, heat, oxygen and/or moisture.

There was a study (J Pharm Pharmacol. 1976 Jan;28(1):1-7. Related Articles, Links Fairbairn JW, Liebmann JA, Rowan MG


The stability of cannabis and its preparations on storage. (To shorten it up I'll translate)- They had 9 samples of pot and 2 of "cannabis resin". They stored small samples of each under varying conditions for up to 2 years. This is a quote-"Exposure to light (not direct sunlight) was shown to the greatest single factos in loss of cannabinoids..." For those medical users who are seeking cannabidiol, there is this interesting quote- " Loss of THC after exposure to light does not lead to an increase in cannabidiol, but air oxidation in the dark does." (hit the link in my sig and scroll down to "cannabidiol"- the stuff is freaking amazing!)

Back to the subject- that abstract was about storing pot, but I think it would be counter-productive, in terms of THC, to have the plants under 24/7 at the end, since light is the major destroyer of THC, according to the study. Yet in all reality, you wouldn't likely notice that much difference, unless you were actually looking for it. That's just my opinion. Granny

 

[Soft Smoke]

Plant biology 101A

Plant biology 101A

OK...here's some basic plant biology for you newbs or those who are new to growing indoors.

Plants need downtime just as much as any animal. Virtually all life on this planet lives by a natural cyclic state of activity/inactivity in recurring cycles. During these cycles different processes occur that must take place to keep that organism healthy. The thing you must understand is that certain of these processes only occur during one of the cycles and cannot be forced during the other.

In practical terms for us, this means that during periods of photo activity (during the day cycle) respiration, nutrient transportation, and cellular division are the plant's primary focus. It wants to breathe deply of the CO2, exhale oxygen, move nutrients gathered adn processed in the root system upwards to the hungry cells wanting to divide. During the night cycle, the plant will virtually cease activity above the surface level and focus entirely on root activity. This is not to say that roots grow at night, but that the plant takes advantage of the non activity above to get a jump on the gathering and processing and storage of nutrients within the root structure for rapid uptake during the photoperiod.

During the night the root structure will continue to pull nutes from the soil or water but the plant structure will not draw them up into the leaves and flowers until the lights come on. Instead, it will forced the roots to act as a battery or solenoid, storing up nutes for a quick release when lights trigger the photoactive cycle. Under the atificial and accelerated growth of a hydro settup, this is magnified to the nth degree and really ids the only means which heavy growth rates can be sustained by the plant.

You must also understand that cannibinoids like THC are also internally regulated chemicals much like the hormones that course throughout our bodies regulating everything from our heartbeat rhythm to how tall we grow. These chemicals are produced in accordance with the plants photoactivity cycles. THC is actually actively produced by the plant in anticipation of the coming light cycle. Thus when tested, THC levels at the end of a photoactive period (sunset) are relatively low due to degredation by heat, light, and other environmental conditions. (Don't let resin production fool you. It is very common for inexperienced growers to have very resinous plants with a low THC content.) Equally, THC content plant-wide is highest just before a photoperiod is about to begin (just before dawn).

In practical terms, this means that the best time to begin harves would be just before dawn or nearing the end of a lights off cycle. THC content in the resins have regenerated to peak levels and nutrients that cause harsh tastes are still being held in the root structutre and lower trunk. I have demonstrated for myself that there is a distinct difference in taste, smoke expansion, burn quality, and cure times depending on what time of day I harvested.

Rule of thumb: Light kills THC and promotes nutes up in the leaves and flowers. Darness promotes THC and allows nutes to settle in the trunk and roots.

This is not just my theory, almost all plants follow this behavior. Simple biology. Look it in a high school science book.

My best to everyone who contributes to the knowledge of the community.

SS

 

[Guest]

I say no way on the 7 days of light.

I'm for 2.5 days of pure darkness before harvest. Takes a lot of the water out of the plant, I heard people saying you get a better wet/dry ratio but for actualy having more final weight and thc I wouldn't bet on.

 

[NdefusableChrnc]

how much thc do you lose during dry/cure

 

[Guest]

The dark also causes starches to go to the roots making the smoke less harsh My last two grows have had a 48 hour dark period before cutting and it really smoothed out the smoke.