18 or 24 hours of light

[The Phoenix]

You did not understand? You need me to spell the details out for ya?

Ok, you did not seem that slow but here you go.. I veg 10 days and flower 60 days to harvest a 4.5 foot tall plant. Sorry if it was not clear. Got that? Sure you did.

Used to veg longer using a 18/6 schedule.

Rumple, you make it sound like you've got the magic answer, but reality is most of your growth is done in flower. Lets see you do a 10 day veg with Sour Bubble as your test subject and get back to us with the results. I've seen your 10 day veg with, what was that, White Widow??? Hardly a good example. My old White Widows grew 8 feet tall, and mostly in flower like yours....

 

[Cool Moe]

24/0 veg here under t5s kept a few inches from the tops of the plants. I start in 2-quart pots and they are ready for up-pot at day 15 with tap roots out the bottoms and full healthy root systems. Preflowers normally show around day 30-32. This plant is 18 days from seed:



I'm not sayin this is the right or wrong way, just sayin it works good for me.

 

[Rumpleforeskin]

Lets see you do a 10 day veg with Sour Bubble as your test subject and get back to us with the results. I've seen your 10 day veg with, what was that, White Widow??? Hardly a good example. My old White Widows grew 8 feet tall, and mostly in flower like yours....

How about I do ten days veg with Master Kush? That enough indica for your test? Want me to try it and give you the results?

 

[ThizZ]

You misunderstand the issues at hand, if you are not measuring the irradiance at canopy over the day, then your opinion is flawed because it's not based upon data. When using data we can prove it, and it has been proven for many decades; it's just in the cananbis world people don't like to read anything other than lame and BS filled books from so-called cannabis gurus.

Hours of light per day does not matter, it's irradiance per day that matters. That is what some peole in this thread, and the other thread, completely misunderstand.

For your garden you may see more growth under 24/0, but that's only because you are not giving enough light per second. Thus, you can't make a blanket statement that 24/0 is better for you, unless you have measured the irradiance and tested the same daily irradiance in fewer hours with a dark period vs. the same daily irradiance in 24/0.

I am not misunderstanding ANYTHING at hand nor did I mention anything about "Seeing more Growth", What I SAID in my Post was that 24/0 WORKED BEST FOR ME! ,This has nothing to do with anything you stated and if your going to quote somebody it would help if you READ their post because that was literally the first thing I said , furthermore YOU have NO idea what I do or do not do in my garden so to say that I am not giving them enough of anything or that I could give them more of anything in a light schedule that is not 24/0 , is hilariously stupid.

 

[Rumpleforeskin]

Lets see you do a 10 day veg with Sour Bubble as your test subject and get back to us with the results. I've seen your 10 day veg with, what was that, White Widow??? Hardly a good example.

I have not planned on growing Sour Bubble. No one I know has had anything good to say about it. I have to grow medical strength marijuana, so I need a kick ass strain.

To answer your question about my results. Here is the grow log for a Master Kush strain I grew. I veg 10 days 24 hours a day to get best results.

I switched back to my Widow strain after this harvest. White Widow had the same quality smoke, just a much better yield.

I use the DLTBS method to get real life results.

 

[Nickcorp187]

Not trying to know the 24 hour a day cycle but what your trying to do is simply mimic the natural conditions in nature. I have grown plants under both 24 hours of light a day and under 18/6 the plants will definately stretch more and branch more increasing yield. I'm def not a newbie check my gallery I have been growing and experimenting with different techniques for over 10 years. I simply am just stating my opinion of the subject.

 

[Nickcorp187]

Here is a quote from "growing good weed a guide" this will further drive home the point I was trying to make.

"There seems to be some confusion when it comes to something called the dark reactions that take place in plants. They are called dark reactions because they are light-independent, but this does not mean that they only take place in darkness. As a matter of fact, the dark reactions occur regardless of the amount of light present as long as the proper substrate compounds are available. These compounds are created during photosynthesis which means that the dark reactions cannot function without light.

However, although cannabis plants are capable of photosynthesizing 24/7, they still need some darkness in order to maintain a proper hormonal balance. So apparently, by keeping your plants under a 24/0 light regime, you are actually inhibiting the circulation of growth hormones that the plant needs in order to stay healthy and eventually prepare for flowering among other things."

 

[Saul Silver]

I personally like 20 on/// 4 off for veg!!!

 

[lilman]

I do 20 on 4 off..24 might be better but i dont like the idea of a 600 watt ballast and bulb running 24/7. I dont know if the plants need a rest but i think the life of the bulb and ballast are increased and the risk of a short or fire is lessened with the chance for them to cool down for a few hours.

Peace: Te lilman

 

[spurr]

Here is a quote from "growing good weed a guide" this will further drive home the point I was trying to make.

"There seems to be some confusion when it comes to something called the dark reactions that take place in plants. They are called dark reactions because they are light-independent, but this does not mean that they only take place in darkness. As a matter of fact, the dark reactions occur regardless of the amount of light present as long as the proper substrate compounds are available. These compounds are created during photosynthesis which means that the dark reactions cannot function without light.

However, although cannabis plants are capable of photosynthesizing 24/7, they still need some darkness in order to maintain a proper hormonal balance. So apparently, by keeping your plants under a 24/0 light regime, you are actually inhibiting the circulation of growth hormones that the plant needs in order to stay healthy and eventually prepare for flowering among other things."

That is a good quote, do you a have link for the reference? I couldn't find it online.

The topic of PGRs (Plant Growth Regulators), such as hormones, is a neat topic and the author is correct. FWIW, many PGRs are made in leafs (i.e. source tissue).

...as long as the proper substrate compounds are available...

FWIW, I wrote about that in terms of why rate of photosynthesis is reduced after about the 17-18th hour of non-stop light due to reduction of active rubisco (into inactive rubscio), and the topic of rubisco activase, etc. Also, co2 fixation and carbon assimilate and partitioning is often reduced after about the 17-18th hour of non-stop light.

 

[Nickcorp187]

Here is a link to the guide. I had to repost it cuz I couldn't find it either.
http://www.icmag.com/ic/showthread.php?t=196526

 

[chef_trichome]

18/6...wiki "Krebs" and "Calvin Cycle"....pretty important shit