24 hours or 18 hours ??? Help

flamdrags420

flamdrags420

Well-Known Member
darkdestruction420 said:
this is from cannabisculture, cannabis is c3, not c4. So it doesnt need a dark period, at all.
Does marijuana require a dark period during the vegetative growth stage? I recently read a grow book that advocated an 18-6 light cycle during the early growth stages.
PSD 420,
Internet
One way in which plants are categorized is by the way they gather and handle carbon dioxide. Cannabis is a C3 plant. It uses the CO2 it gathers during the light period, when it is photosynthesizing. Plants designated C4 also gather CO2 during the dark period for use during the light period. Many C3 plants, including cannabis, do not need a rest period. They continue to photosynthesize as long as they are receiving light.
The plant's photosynthetic rate determines its growth rate because the sugars are used by the plant to build tissue and for energy. Cannabis under continuous light will grow 33% faster than the same plants on an 18-6 light regime.
Click to expand...


I can't find an external source on botany describing this aspect of c3 plants in this manner
 
I

Infomad

Member
So looks like 6 weeks veg 24 a day wen I add up the 6 hours darkness it adds up to nearly an extra 2 weeks veg in 35 litter pots and powers free so who cares thanks to every one hope to get over 6 oz of each plant 9 week flower big budda cheese. Topping and super cropping first time 35litter so dnt now what to get Any ideas ??
 
D.Gotti

D.Gotti

Active Member
Ive run 18/6 for a long time, I ran 24hrs veg lighting for the first week of my current grow and I switched back to 18/6. They didnt grow nearly as fast with 24hrs as the did with 18/6. Seriously not even close. My clone lighting is 24hrs still. :) Veg will be 18/6 though.
 
crazyhazey

crazyhazey

Well-Known Member
20/4 or 18/6 is good, ive never gone in depth to light cycle but our earth gets dark for about 8 hours, so steady growth can even be found in 16/8 since cannabis grew wild for hundreds of thousands of years. Ive always thought dark period and light temperature inspire root growth, but i haven't had a problem with 24/0, my plants just looked a little more stretched and sort of stressed.
 
RawBudzski

RawBudzski

Well-Known Member
Dont JUST DO IT, this isnt nike. Their should be reasons for going 24/0 not the Basic "it grows faster" thats impatient and ill advice in my opinion.
 
darkdestruction420

darkdestruction420

Well-Known Member
do other threads on this forum count? cuz ive got another one but you said an external site. The cannabis culture article said it as well. https://www.rollitup.org/indoor-growing/9416-24-hours-vs-18-veg.html
heres another one i found, its a bit long, but worth the read.
Photosynthesis is the process of converting light energy to chemical energy and storing it in the bonds of sugar. This process occurs in plants and some algae (Kingdom Protista). Plants need only light energy, CO2, and H2O to make sugar. The process of photosynthesis takes place in the chloroplasts, specifically using chlorophyll, the green pigment involved in photosynthesis.
Photosynthesis takes place primarily in plant leaves, and little to none occurs in stems, etc. The parts of a typical leaf include the upper and lower epidermis, the mesophyll, the vascular bundle(s) (veins), and the stomates. The upper and lower epidermal cells do not have chloroplasts, thus photosynthesis does not occur there. They serve primarily as protection for the rest of the leaf. The stomates are holes which occur primarily in the lower epidermis and are for air exchange: they let CO2 in and O2 out. The vascular bundles or veins in a leaf are part of the plant's transportation system, moving water and nutrients around the plant as needed. The mesophyll cells have chloroplasts and this is where photosynthesis occurs.


As you hopefully recall, the parts of a chloroplast include the outer and inner membranes, intermembrane space, stroma, and thylakoids stacked in grana. The chlorophyll is built into the membranes of the thylakoids.
Chlorophyll looks green because it absorbs red and blue light, making these colors unavailable to be seen by our eyes. It is the green light which is NOT absorbed that finally reaches our eyes, making chlorophyll appear green. However, it is the energy from the red and blue light that are absorbed that is, thereby, able to be used to do photosynthesis. The green light we can see is not/cannot be absorbed by the plant, and thus cannot be used to do photosynthesis.
The overall chemical reaction involved in photosynthesis is: 6CO2 + 6H2O (+ light energy)
C6H12O6 + 6O2. This is the source of the O2 we breathe, and thus, a significant factor in the concerns about deforestation.
Click on the chlorophyll
to see how to draw one.Get the Corel Presentations
Show It!™ plug-in Click the picture to re-start or press [ESC] to stop. You may


There are two parts to photosynthesis:
The light reaction happens in the thylakoid membrane and converts light energy to chemical energy. This chemical reaction must, therefore, take place in the light. Chlorophyll and several other pigments such as beta-carotene are organized in clusters in the thylakoid membrane and are involved in the light reaction. Each of these differently-colored pigments can absorb a slightly different color of light and pass its energy to the central chlorphyll molecule to do photosynthesis. The central part of the chemical structure of a chlorophyll molecule is a porphyrin ring, which consists of several fused rings of carbon and nitrogen with a magnesium ion in the center.
The energy harvested via the light reaction is stored by forming a chemical called ATP (adenosine triphosphate), a compound used by cells for energy storage. This chemical is made of the nucleotide adenine bonded to a ribose sugar, and that is bonded to three phosphate groups. This molecule is very similar to the building blocks for our DNA.

The dark reaction takes place in the stroma within the chloroplast, and converts CO2 to sugar. This reaction doesn't directly need light in order to occur, but it does need the products of the light reaction (ATP and another chemical called NADPH). The dark reaction involves a cycle called the Calvin cycle in which CO2 and energy from ATP are used to form sugar. Actually, notice that the first product of photosynthesis is a three-carbon compound called glyceraldehyde 3-phosphate. Almost immediately, two of these join to form a glucose molecule.
 
RawBudzski

RawBudzski

Well-Known Member
bitch we outchea
wht nga all the way dummy witit all the way 100 witit bitch we outchea what nga!

pocket monster in the club murk yo ass instantly bitch we outchea what nga !
 
cowboylogic

cowboylogic

Well-Known Member
RawBudzski said:
Dont JUST DO IT, this isnt nike. Their should be reasons for going 24/0 not the Basic "it grows faster" thats impatient and ill advice in my opinion.
Click to expand...
I have no idea how you can equate faster growth to being impatient. Simply foolish. And thats my opinion....
 
RawBudzski

RawBudzski

Well-Known Member
Plants grow during dark periods most make the argument asif they dont. So in the big picture, its more impatience than helping your plant. 24/0 if your on a strict perpetual, if not. your impatient and possibly in-denial about it
 
darkdestruction420

darkdestruction420

Well-Known Member
RawBudzski said:
Plants grow during dark periods most make the argument asif they dont. So in the big picture, its more impatience than helping your plant. 24/0 if your on a strict perpetual, if not. your impatient and possibly in-denial about it
Click to expand...
No, we said they dont perform photosynthesis to make energy to put into the new growth. It's a pretty simple concept......So, try to tell me how you reason to yourself that they need a dark period. you said you didnt know if it made root growth faster for 1, so that kills your first point, a week more of light to grow with over the veg cycle is a big deal, look at a 4 week old plant and then that same plant at 5 weeks, their should be a great difference in size. You keep acting like you know it all, but your theory makes no sense, Plants are not people, the whole "well, humans need sleep so plants must too" idea is laughable. We are not even in the same kingdom classification wise. do you know tuna never sleep? their is an example of it in nature....
 
RawBudzski

RawBudzski

Well-Known Member
I know what I know from my hands on. and 24/0 18/6 on clones from the same plant will not look that different. as you say 4th from 5th week. Because a plant still "Grows" during dark period.
 
darkdestruction420

darkdestruction420

Well-Known Member
darkdestruction420 said:
No, we said they dont perform photosynthesis to make energy to put into the new growth. It's a pretty simple concept......So, try to tell me how you reason to yourself that they need a dark period. you said you didnt know if it made root growth faster for 1, so that kills your first point, a week more of light to grow with over the veg cycle is a big deal, look at a 4 week old plant and then that same plant at 5 weeks, their should be a great difference in size. You keep acting like you know it all, but your theory makes no sense, Plants are not people, the whole "well, humans need sleep so plants must too" idea is laughable. We are not even in the same kingdom classification wise. do you know tuna never sleep? their is an example of it in nature....
Click to expand...
I was a bit harsh here, i didnt really mean to, in my mind i didnt really notice it but after reading it again, it does kind of come off that way.
 
RawBudzski

RawBudzski

Well-Known Member
what do you grow? I know from seeing it myself that 18/6 is no big diff than 24/0 and I have seen 24/0 produce more males/thinner plants. but thats me. if your using CFLs which, than 24/0 away. im sure your plants could use all they can get
darkdestruction420 said:
No, we said they dont perform photosynthesis to make energy to put into the new growth. It's a pretty simple concept......So, try to tell me how you reason to yourself that they need a dark period. you said you didnt know if it made root growth faster for 1, so that kills your first point, a week more of light to grow with over the veg cycle is a big deal, look at a 4 week old plant and then that same plant at 5 weeks, their should be a great difference in size. You keep acting like you know it all, but your theory makes no sense, Plants are not people, the whole "well, humans need sleep so plants must too" idea is laughable. We are not even in the same kingdom classification wise. do you know tuna never sleep? their is an example of it in nature....
Click to expand...
 
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