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Why people stop gassing co2 for last couple of weeks?

I often notice people backing off or even stop pumping co2 late in flowering.

What is the reason behind it?

Is it that temps need to be lowered so the co2 doesn't benefit anymore or could high concentrates of co2 (1000-1500ppm) actually even do some harm?

I remember I have had plants to take 10 weeks to get ripe and I've never understood why, because that strain should be 8-9 weeker.. and I've always pumped 1300ppm until the harvest. Could co2 delay ripening?
 

Lester Beans

Frequent Flyer
Veteran
Yes he is.

Co2 encourages plants to continue growing.

I only run co2 from week 3-6 unless I want more stretch in the beginning of too wet, then I'll start at beginning of flower.
 

moses wellfleet

Well-known member
Moderator
Veteran
I could be wrong but I would have said it is because it would be a waste of CO2 to add it during that phase of flowering. No new growth taking place so any extra CO2 would be wasted!
 

Lost in a SOG

GrassSnakeGenetics
Only my opinion but veg seems like one of the best times to me to be adding co2, the results are impressive, but its horses for courses and it doesnt benefit them in any way ive seen it seems after full flower set has finished around week 5-7 strain dependant.

As mentioned once that vegatative/transition biomass growth has stopped the plant is hardly growing comparatively.

You also have to consider co2s effect of raising stomatal conductance, thus closing stomata.. obviously lots of things effect stomatal conductance from humidity, light spectrum/intensity, temperature, nutrient availability, air movement etc.. so get all your shit dialed or you might be doing more harm than good..imo...:2cents:
 
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therevverend

Well-known member
Veteran
I've never used CO2 and I realize I don't know much about ethylene. Only that if I put my unripe rock hard avocados next to my ripening bananas they're more likely to ripen instead of rotting as is usually the case when I buy avocados this far north. A simple search on wikipedia gave me good information.

https://en.wikipedia.org/wiki/Ethylene

Ethylene serves as a hormone in plants.[22] It acts at trace levels throughout the life of the plant by stimulating or regulating the ripening of fruit, the opening of flowers, and the abscission (or shedding) of leaves. Commercial ripening rooms use "catalytic generators" to make ethylene gas from a liquid supply of ethanol. Typically, a gassing level of 500 to 2,000 ppm is used, for 24 to 48 hours. Care must be taken to control carbon dioxide levels in ripening rooms when gassing, as high temperature ripening (20 °C; 68 °F)[citation needed] has been seen to produce CO2 levels of 10% in 24 hours.

Farmers in Florida would commonly get their crops to ripen in sheds by lighting kerosene lamps, which was originally thought to induce ripening from the heat. In 1924, Frank E. Denny discovered that it was the molecule ethylene emitted by the kerosene lamps that induced the ripening.

How about adding ethylene to ganja the last few weeks to stimulate faster flowering? Indoors it would be easy to apply but outdoors or in greenhouses if you could apply it in early August it could work wonders.

. Ethylene production can also be induced by a variety of external aspects such as mechanical wounding, environmental stresses, and certain chemicals including auxin and other regulators.

Environmental cues such as flooding, drought, chilling, wounding, and pathogen attack can induce ethylene formation in plants.

Maybe there's more to stem girdling, leaf stripping, and other stress practices then I thought.

I'm amazed I haven't read up on this before. The list of plant responses to Ethylene is worth looking at. It induces germination, root hair growth, affects the plant's response to gravity, interferes with auxin transport causing high amounts of auxin in some parts of the plant. Helps plants deal with salt stress.
 

Wendull C.

Active member
Veteran
I could be wrong but I would have said it is because it would be a waste of CO2 to add it during that phase of flowering. No new growth taking place so any extra CO2 would be wasted!

No, they keep growing new flowers instead of finishing. That's the problem. I can get more weight with co2 till the end but quality suffers.
 

Lester Beans

Frequent Flyer
Veteran
Co2 in the veg room is really awesome if you need fast lush growth.

We going straight to flower from rooted clone, co2 will get that canopy filled right in during the stretch.

Just kill the co2 two weeks before harvest.

My method is when I kill the co2 I start adding Overdrive flowering hardener/ripener. Excellent product.

I used Advanced Big Bid when I start co2 at week 3 and run until time for Overdrive.
 

Easy7

Active member
Veteran
Better take it easy Lester. I'm starting to pick up your in Ohio.


A lot of dumb hippies in Ohio. Forget the bottled nutrients. Just marketing gimmicks like co2 is.


I am co2. A lot of hot air.


I know nobody reads this but Gypsy. You don't know I was raped at 5 and my uncle cop put me in cuffs because they didn't want to kill the president again. I was told they had something to do with JFK.


An oil company and Annapolis. JFK wanted the Mafia/unions. He had lot's of socialist dreams. Like we all do but that's odd when it comes to native American hierarchy. We know it's all war.


Glad you made it out of prison. I just made up stuff at one point in the story. I didn't know how to execute power as power usually turns against me like it does for all of us.
 
With the people not using co2 weeks 1-3 in flower, do you just run it at normal levels of 2-300ppm?? Or fully take it out of your room?? Also end of flower do I fully remove co2 or what, I’m in a sealed room
 

Wendull C.

Active member
Veteran
Use co2 until the end of flower at 1000ppm. In the ripening phase bring in fresh air instead or in the case of sealed rooms lower it to ambient levels.
 
Thanks wendull that’s kinda what I thought, I’ll turn it down to normal indoor house levels for ripening what about the beginning of flower? Still run the 1000/1200 area?
 

Lost in a SOG

GrassSnakeGenetics
^^ 400-800..

I only noticed recently, since having to grow in the home again, how great a house full of dogs was for co2..
 

moses wellfleet

Well-known member
Moderator
Veteran
No, they keep growing new flowers instead of finishing. That's the problem. I can get more weight with co2 till the end but quality suffers.

I only noticed this once, with a strain I didn’t like anyway. Could it be higher temps that are affecting quality? CO2 enrichment requires higher levels of temps, nutes and water but only up to a point. Are you using a propane burner?
 

Wendull C.

Active member
Veteran
No bottled co2. The strain I first found this out on was bty og which I have had since before it was named. I know the girl like an old friend. Maybe better. The comparison between flowers left at 1500 ppm and those lowered to ambient levels from day 56 to 70 or even 60 to 75 is not even close.

Since finding this out it has improved the quality of every other strain I grow.

That being said , I am in a quality market. If you are in a weight market where people are hungry for whatever they can get, by all means run that shit at 1500 ppm the whole way through and get your weight.
 

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