Putting the nail in the myth: 24/0 vs 18/6

18/6 works best. Why?

Mitochondrial respiration, which is used primarily for plant growth and development, happens all the time, but happens MOST during the dark period.

Dark (aka Mitochondrial) respiration is responsible for:

1) biosynthesis of new structural biomass
2) translocation of photosynthate
3) uptake of ions from soil
4) Assimilation of N and S into organic compounds
5) Protein turnover
6) Cellular ion-gradient maintenance

As I said, while it happens even during the daytime, it doesn't happen nearly as much as it does during the dark period. Dark periods allow for more growth. It's not a stretch, that's actual cell division happening.

i think everything in life runs in cycles,... trees lose their foilage in winter and grow it back in spring, the tide comes in and goes out,.... humans as well as plants inhale and then exhale,... you cannot inhale all the time, and plants exhale when they are in the dark,... everybody knows that plants take in CO2 and conduct photosynthisys during the light period,... what is less known or maybe just ignored is that during the dark period this process reverses, that is they take in oxygen and give off CO2,... if you had a way to increase the O2 during the dark period you would see a dramatic difference in groth

From my own casual observations, 18/6 will grow larger, lankier plants, but 24/0 using CFL's or T-5's will grow smaller tighter plants with very close nodes. If you are growing for yield (who isn't?) then 18/6 is the way to go for you!

BlackHit said:

From my own casual observations, 18/6 will grow larger, lankier plants, but 24/0 using CFL's or T-5's will grow smaller tighter plants with very close nodes. If you are growing for yield (who isn't?) then 18/6 is the way to go for you!

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where is your proof that 18-6 with its lankier growth makes a bigger yield? my observation is that tighter node structure, is the tighter the bud mass.....so how does this stretching increase your yield? if this were the case, then all these super stretched plants will be yielding pounds!


Peace

HAT TRICK STEVE said:

i think everything in life runs in cycles,... trees lose their foilage in winter and grow it back in spring, the tide comes in and goes out,.... humans as well as plants inhale and then exhale,... you cannot inhale all the time, and plants exhale when they are in the dark,... everybody knows that plants take in CO2 and conduct photosynthisys during the light period,... what is less known or maybe just ignored is that during the dark period this process reverses, that is they take in oxygen and give off CO2,... if you had a way to increase the O2 during the dark period you would see a dramatic difference in groth

Click to expand...

Plants do not intake O2 through their leaves. Roots take oxygen, yes. Plants breathe CO2 and transpire O2 as a waste product - there is no reversal of the process during the nighttime.

And as I stated before, it's not stretching during the dark. That is actual cell division - aka GROWTH. It's a HUGE part of mitochondrial respiration during the night time. It's why you wake up and check on your plants after the dark period and yo go "Holy shit they grew another inch overnight!" There is no stretch as plant cell walls are rigid and much more inflexible than human cells. It is growth, and nothing more.

KaliKitsune said:

Plants do not intake O2 through their leaves. Roots take oxygen, yes. Plants breathe CO2 and transpire O2 as a waste product - there is no reversal of the process during the nighttime.

And as I stated before, it's not stretching during the dark. That is actual cell division - aka GROWTH. It's a HUGE part of mitochondrial respiration during the night time. It's why you wake up and check on your plants after the dark period and yo go "Holy shit they grew another inch overnight!" There is no stretch as plant cell walls are rigid and much more inflexible than human cells. It is growth, and nothing more.

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Dude u said it all in 2 threads !

GrowingMadness said:

I can't find my old 7 page thread regarding this.

There we've had a lot of debates whether continuous light is better than 18/6

We did agree that plants don't need the dark time to GROW

But when they have the dark time they STRETCH

So what I did was make an experiment. One plant was under 24/0, the other under 18/6 for several days.

Result?

18/6 is 2x bigger

Why?

It stretches during the dark time, allowing more room for leaves to grow and more light for each leaf.

There, now it all makes sense. If you want your plants to grow faster, put them on 18/6.

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that all being said... another myth is that if u give them 24 hours of light they dont get time to develop a good root system...and another myth is that the beter the root system the better chance for female plants....can anyone expain this?

so if we keep sativas on 24 wer're styling!!!

one thing i know is that plants during the night of course grow(and not stretch) but they are using day energy that is stored.thats all i know

with little dark period comes little root formation which is responsible for the short internodes.. as the plant is a reflection of its root system.. and it's also the base of the plant. in the first 2 weeks of 12/12 with no flowers the roots take off and create a greater base. (giving bloom ferts too early will also make this worse) causeing the plant alot more stretch then desired.. which is why 20/4 is great.. plenty of light energy and just enough dark cycle for good root growth... also 18/6 allows for good root growth but a bit less light energy..
weather it has a huge affect on yeild i dont know..

KaliKitsune said:

Plants do not intake O2 through their leaves. Roots take oxygen, yes. Plants breathe CO2 and transpire O2 as a waste product - there is no reversal of the process during the nighttime.

And as I stated before, it's not stretching during the dark. That is actual cell division - aka GROWTH. It's a HUGE part of mitochondrial respiration during the night time. It's why you wake up and check on your plants after the dark period and yo go "Holy shit they grew another inch overnight!" There is no stretch as plant cell walls are rigid and much more inflexible than human cells. It is growth, and nothing more.

Click to expand...

good read..
plants need dark..

BlackHit said:

From my own casual observations, 18/6 will grow larger, lankier plants, but 24/0 using CFL's or T-5's will grow smaller tighter plants with very close nodes. If you are growing for yield (who isn't?) then 18/6 is the way to go for you!

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do the plants under 24/0 stretch more when flowering??

Blah Blah Blah all this talk and still nobody with any pictures or documented research to prove anything.

smppro said:

Blah Blah Blah all this talk and still nobody with any pictures or documented research to prove anything.

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http://www.google.com/search?hl=en&safe=off&client=firefox-a&rls=org.mozilla:en-US:official&hs=KMC&q=mitochondrial+respiration+in+plants&btnG=Search
First three results you get are scholarly articles on the very subject. You were saying?

24 hours of light is just unnatural. then again growing weed in your closet is more unnatural, go figure.

http://www.life.illinois.edu/plantbio/wimovac/respirat.htm

This one points out what happens during dark and light respiration. Again, only some things happen during the dark period, including a majority of growth.