At What PPM Level Does CO2 Assist in Side Branching Wthin the Flowers?

[Douglas.Curtis]

Hello,

I've had a question for some time and was hoping someone on here had done the research. Has anyone tested the same strain, with the same feeding methods, with varying levels of CO2 AND measured the amount of internal stem growth in their end flowers?

Right now the cannabis flowers I grow have only a single main stem, no side branching. The last run I did not accurately measure my nutrients (first time in 15 years I didn't use a syringe) and picked up some tiny side branches, presumably from the excess nitrogen.

I guess what I'm trying to ask is, at what ppm does quality stop with CO2 and excessive growth take place? At what CO2 level can I expect to begin seeing side branching within my cannabis flowers?

I really *LIKE* not having any side branches.

Douglas

 

[eebbnflow]

I think after 42 views everyone is stumped here

I'm not sure if there is a correct answer... Keep Co2 at 1000-1500 ppm max . Personally I find 1000-1200 is plenty . From what I've read anything over 1500-2000 ppm is a waste of co2 . If you don't want side branching grab some scissors ?

 

[Douglas.Curtis]

I think after 42 views everyone is stumped here

I'm not sure if there is a correct answer... Keep Co2 at 1000-1500 ppm max . Personally I find 1000-1200 is plenty . From what I've read anything over 1500-2000 ppm is a waste of co2 . If you don't want side branching grab some scissors ?

I kind of expected this.

I guess the question is, at what ppm level does quality begin degrading? I'm fully aware that 1200ppm is 'about' where the 'limits' of CO2 are, for growth anyway.

I'm looking for maximum, quality cannabis production, not maximum cannabis production rates. When quality suffers due to something I can fix in veg, I look to fix it with additional veg time, not push it during flower.

Where are the folks recommending 750-800ppm max?

Douglas

 

[Mikell]

Side branch growth is a result of lighting, pruning and auxin levels to my mind. I've never heard the subject raised though that doesn't mean there is not something to it. But I think you will have to experiment if you want more answers.

 

[Limeygreen]

High co2 levels with higher temperatures will cause more generative growth meaning high levels of co2 favour flowers not branching. 600 ppm of co2 with cool, flat temperature regime will encourage more branching, say 18-20 night with 20-22 day, avoiding dips in temperature should encourage a vegetative growth but may also compromise yield.

 

[Douglas.Curtis]

Ok, I have to clarify here.

I'm not talking about 'branches,' off the plant, I'm talking about the stem content of the bud structure. Single stem, no side stems within the bud just full flower.

Does that clarify?

 

[Mikell]

I still think you are on your own.

Not negatively, but that this is new ground. Maybe someone will come put the lie to that. I am so very frequently wrong. But I learn the right HAH

Do you log data? What hours are lights running?

re: heat, possibly just a spike.

I hate to sound like a broken record, but out of all of us, spurr has spent the most time researching CO2. To my knowledge. You can find him at The Logical Gardener.

As for too high, I believe you're looking at fives figures or more to produce toxicity to the plant. But without raising other parameters (heat, nutrients, etc) on scale at or above 1000-1200, you're effecting the atmosphere, not cellular respiration.

Are some strains more sensitive? Is there a rising scale towards toxicity? I don't think many have gone that deep. I would look to the wider academic community.

 

[Douglas.Curtis]

Appreciate it. Many thanks.

Douglas