CO2 Users: Should CO2 be stopped at the end of flowering?

[louie]

So say I am running CO2 in the 1200-1500 ppm range all throughout flowering, should I cut back on the CO2 concentration toward the end of flowering (say the last 2 weeks) to let them ripen up? I've have heard some people do and some don't. I am looking to get optimum quality and yield, so if keeping the CO2 levels constant until chop at 1200-1500 ppm will add a few more days but bigger yield, that is no big deal, but if it adds a couple of weeks that is. So I am looking for those who have any experience and knowledge on the topic. thanks

 

[Rowdy420]

The CO2 will help speed the ripening phase, so there really is no reason to stop now. The cO2 won't make the plant flower any longer instead it makes em finish faster. You'll know when they're done, they'll look like they have seeds in the calyx and get all swollen like they're going to pop.

Good luck, peace

 

[Shcrews]

not so sure about that, from what i've read here most people stop using co2 around week 5-6, because high levels of co2 in the atmosphere will speed growth in early-mid flower but in late-flower will actually delay ripening without increasing your yield

in my experience, it doesn't really matter if you run co2 the last 2-3 weeks or not, so you might as well save money

also, i like to drop my temps in late flower, which is not conducive to massive co2 uptake anyway.

 

[vta]

Before I was perpetual I would stop when I started the flush. For reasons like shcrews said, to save money and speed up the time to chop.

 

[louie]

Appreciate the info guys. Cutting CO2 during flush... that is what I was thinking too. I always seem to get new white pistils growing at the end of flowering when I leave CO2 at 1200-1500 ppm until chop. So what level do you cut CO2 down to during flush (last 2 weeks)? 300 ppm- 500 ppm?

 

[Rowdy420]

Your going to get that new growth once you start to flush because the plant is going to use up the remaining nutes it has in it's leaves regardless of CO2 levels. If CO2 speeds growth why would it slow it down in the end? I would lower the levels instead of cutting them off completely since the plant is not uptaking the normal level of nutes, would seem to help it "breathe" better since plants take in CO2 and put off oxygen. If money is an issue then I would say cut it and save a few bucks but if your running a burner there is really no reason to stop in my opinion.

Good luck, peace

 

[Marshall]

ethylene supposedly helps plants ripen.

Co2 supposedly prevents ethylene production

I lower to 300 PPM

 

[Rowdy420]

Normal atmosphere is at 300 ppm so there really isn't any reason to run anything!

 

[Cannabean]

Normal atmosphere is at 300 ppm so there really isn't any reason to run anything!

on that point, in a sealed room, won't cutting co2 supplementation at the end cause the plants to consume the co2 down to 0ppm and stifle maturation?

 

[Rowdy420]

I've never encountered a room that would go down to 0 ppm of CO2, not sure even if this is possible? During the night cycle when CO2 supplementation is not running the girls will "off-gas" CO2 and make levels stay at or near the levels you run during the day, so if you running at 1500 ppm during the day it'll be the same a night.

 

[Shcrews]

i just vent in outside air or use a passive intake i.e. open the door for the last 2 weeks,

 

[Bongstar420]

They will stop growing when Sulfur is limited regardless of the atmosphere.

All of this talk about CO2 assimilation rate is irrelevant without radiocarbon studies that show the objective distribution of CO2 in the plant. Its actually easy to do if you are not a bitch to the establishment and are willing to risk your lab to the feds illegal interventions.

Here is how I look at it: If you are growing pot and are worried about spending an extra $20 over multiple lbs of harvest, maybe you shouldn't be growing. We are talking cost of CO2 not equipment. CO2 = $0.50/LB

* I am running CO2 constantly with ventilation. It doesn't cost me anything. The equipment to do it was like $30

Your going to get that new growth once you start to flush because the plant is going to use up the remaining nutes it has in it's leaves regardless of CO2 levels. If CO2 speeds growth why would it slow it down in the end? I would lower the levels instead of cutting them off completely since the plant is not uptaking the normal level of nutes, would seem to help it "breathe" better since plants take in CO2 and put off oxygen. If money is an issue then I would say cut it and save a few bucks but if your running a burner there is really no reason to stop in my opinion.

Good luck, peace