How much does Co2 speed up growth at vegetative stage?

Helmut79

Helmut79

Well-Known Member
Theoretically, if you vegged plants for 10 weeks using ventilation, then for how long would you need to veg the plants when using Co2 if you want them to grow to be as big as before - same in size?

In other words, how much time is it possible to "win" using Co2 in a sealed room compared to ventilation?

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CO2 in Vegetative Stage

CO2 is most effective at increasing the speed of vegetative growth, so adding extra CO2 is one way to grow bigger plants in less time during marijuana’s vegetative stage of growth. - http://www.growweedeasy.com/co2#pros-cons
 
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bradburry

bradburry

Well-Known Member
good quastion.....im guessing none .... i thought the co2 was just to keep it alive and cant be used as a booster.

i maybe wrong
 
Helmut79

Helmut79

Well-Known Member
Big question: Does 15-20% larger = 15-20% faster?

In theory, when I want same sized plants it would take them 15-20% less time to get there, right? - instead of 10 weeks it would take 8 to 8,5 weeks and I would win 1,5 - 2 weeks of time?
 
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TheYokel

TheYokel

Well-Known Member
My take on co2:

Number one... you have to understand, your grow room has to be running at an efficiency past the level of using the ambiently available carbon dioxide in their environment, to even see much of a boost, if any at all, from adding extra.

In other words, if you aren't using all of what's in there already, pumping more in probably won't net you a huge return.

Now, co2 can help speed up the process of making sugars and going through their natural photo-processes... and extra co2 is proven to make plants produce more foliage while growing... but to say that it actually speeds up the division of cells and makes a plant grow *faster*, is iffy. It might make the plant more efficient, and therefore can use that energy to split *more* cells... but from my understanding, they will still split at the same rate.

In other words, your plant might make 10 extra leaves, but it will still take a week to make those leaves, regardless of the number produced.
 
greasemonkeymann

greasemonkeymann

Well-Known Member
Helmut79 said:
Big question: Does 15-20% larger = 15-20% faster?

In theory, when I want same sized plants it would take them 15-20% less time to get there, right? - instead of 10 weeks it would take 8 to 8,5 weeks and I would win 1,5 - 2 weeks of time?
Click to expand...
NO, not faster. It has the same effect of veging longer before flowering, but flowering time is dictated by maturity of the plant, as well as genetics.
At least that's what it was for me, I used CO2 for yrs, but I stopped using it. CO2 will give you thicker stems and slightly better yields, but the results weren't mindblowing. In fact I can think of four veteran growers that stopped using co2, off the top of my head... BUT it doesn't get cold here, i don't need it for heating, so that's a lil different.
I also noticed a slightly more bland taste when using co2.
 
Dr. Who

Dr. Who

Well-Known Member
In many experiments on the use of CO2.
I have found that the use of gassing in veg is NOT worth the cost to benefit. PERIOD!

Now then. The use of gas in bloom is a whole nother story!
If you have a moderately sized home grow you can increase bud size and density to increase the overall yield by as much as 30+ %. You must strictly control the enviro. 85 F and you have to regulate the on time and and no gassing at night. A good quality enviro control does this very well.

This is a nice one.
https://4hydroponics.com/autopilot-digital-environmental-controller
 
Dr. Who

Dr. Who

Well-Known Member
greasemonkeymann said:
NO, not faster. It has the same effect of veging longer before flowering, but flowering time is dictated by maturity of the plant, as well as genetics.
At least that's what it was for me, I used CO2 for yrs, but I stopped using it. CO2 will give you thicker stems and slightly better yields, but the results weren't mindblowing. In fact I can think of four veteran growers that stopped using co2, off the top of my head... BUT it doesn't get cold here, i don't need it for heating, so that's a lil different.
I also noticed a slightly more bland taste when using co2.
Click to expand...
Good point!
I quit using it as my grows increased from x-X-x tents to square footage long ago.

But if you run in tents or small area's,,,it can work for you if done properly.
 
greasemonkeymann

greasemonkeymann

Well-Known Member
Dr. Who said:
Good point!
I quit using it as my grows increased from x-X-x tents to square footage long ago.

But if you run in tents or small area's,,,it can work for you if done properly.
Click to expand...
oh hell ya, it'll work, and work well, but you gotta PUMP the lights on big time.
I've always kinda day-dreamed about a greenhouse outside full of CO2 using the sun as a light source, THAT is where you'd get some intense yields
 
greasemonkeymann

greasemonkeymann

Well-Known Member
Dr. Who said:
In many experiments on the use of CO2.
I have found that the use of gassing in veg is NOT worth the cost to benefit. PERIOD!

Now then. The use of gas in bloom is a whole nother story!
If you have a moderately sized home grow you can increase bud size and density to increase the overall yield by as much as 30+ %. You must strictly control the enviro. 85 F and you have to regulate the on time and and no gassing at night. A good quality enviro control does this very well.

This is a nice one.
https://4hydroponics.com/autopilot-digital-environmental-controller
Click to expand...
another REALLY important thing is to be VERY careful not to grow using high amounts of co2 near where you sleep.
High co2 level are BAD for your heart... and if it's not sealed and it gets into your bedroom, it can literally kill you, you simply won't wake up. be careful, especially in like closet grows
that's how they slaughter some animals actually.
@80-90% co2 the pigs are unconscious in about one minute
 
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Dr. Who

Dr. Who

Well-Known Member
greasemonkeymann said:
another REALLY important thing is to be VERY careful not to grow using high amounts of co2 near where you sleep.
High co2 level are BAD for your heart... and if it's not sealed and it gets into your bedroom, it can literally kill you, you simply won't wake up. be careful, especially in like closet grows
Click to expand...
That's where math and a enviro controller fix that problem. And even with out that....you have to reach 50,000 ppm to cause health problems.....Over 30 times maximum what a plant can use!

Length x width x height x .0011(.0011 is the gas value for a target of 1100ppm)
Example:
A room of 5 x 5 x 7 contains 175sq ft. 175 x .0011 equals .1925 cubic feet of Co2 to reach 1100ppm for that area.
Now you need to figure out what to set your regulator to achieve that in a given time. You want it done fast for better effectiveness overall. So if your tank regulator is set to say 2 cubic ft per hr. You are delivering .2 cubic ft of gas in 6 min. I might dbl that to 4 cubic ft per hr. and set my enviro controller to 3 min. on time. Set your Humidity level and your temp level on the controller and sit back and see how long it takes for the fan to run (you connect that to the controller too). Say it takes 17 min for the fan to exhaust the area. Now set your "off" time to 18min. and your golden.

1300ppm is the max that the plant will effectively use. Anything over that and your just wasting money.
In the long run, I never saw any real bennie's over 1200 and always ran mine at 1100 and used the above formula.
 
bradburry

bradburry

Well-Known Member
@vostok awhile ago you taught me about co2 and about stomatas ...and told me i would be wasting my time with c02?........BUT ALL THE ABOVE ARE SAYING DIFFERENT......



WHY?

not dissin you my friend you taught me well .
 
Dr. Who

Dr. Who

Well-Known Member
bradburry said:
@vostok awhile ago you taught me about co2 and about stomatas ...and told me i would be wasting my time with c02?........BUT ALL THE ABOVE ARE SAYING DIFFERENT......



WHY?

not dissin you my friend you taught me well .
Click to expand...
Wowser! Really V? I want to read that answer! No insult buddy.
 
greasemonkeymann

greasemonkeymann

Well-Known Member
Dr. Who said:
That's where math and a enviro controller fix that problem. And even with out that....you have to reach 50,000 ppm to cause health problems.....Over 30 times maximum what a plant can use!

Length x width x height x .0011(.0011 is the gas value for a target of 1100ppm)
Example:
A room of 5 x 5 x 7 contains 175sq ft. 175 x .0011 equals .1925 cubic feet of Co2 to reach 1100ppm for that area.
Now you need to figure out what to set your regulator to achieve that in a given time. You want it done fast for better effectiveness overall. So if your tank regulator is set to say 2 cubic ft per hr. You are delivering .2 cubic ft of gas in 6 min. I might dbl that to 4 cubic ft per hr. and set my enviro controller to 3 min. on time. Set your Humidity level and your temp level on the controller and sit back and see how long it takes for the fan to run (you connect that to the controller too). Say it takes 17 min for the fan to exhaust the area. Now set your "off" time to 18min. and your golden.

1300ppm is the max that the plant will effectively use. Anything over that and your just wasting money.
In the long run, I never saw any real bennie's over 1200 and always ran mine at 1100 and used the above formula.
Click to expand...
My fear wasn't for a normally running CO2 enrichment, but of that with a malfunctioning one, or more specifically, a leaking one, this concern would be more for a tank style co2 system, not for burners
 
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