Book explains why CO2 is lowered at end of flowering

[Guest]

I have a book that explains why the CO2 is cut off during the last 2 or 3 weeks of flowering,

They say

1) Excess CO2 late in flowering lowers aromas and potency
2) During the last 2-3 weeks of flowering the plant is basically done with growth and just ripening the buds, therefor the CO2 is not used by the plant.

Of course they said the exact reason is not documented or known but these were his guesses.

The man who wrote this book is the legendary Ed Rosenthal! I trust his word

Edit: Although I have read people's posts on here saying they run CO2 all the way to harvest and have no aroma or potency problems, so I find it hard to believe the CO2 late in flowering effects them THAT much but maybe still slightly. We need someone to run a side by side comparison if ya ask me

 

[Stealthy]

Hey Alien what's up? I always run my co2 gen to the end with no degradation in potency or smell. Some of my most explosive growth comes in the last two to three weeks! I can see cutting it off in the last 5 days to a week but my bitches are still growing at 5 weeks flowering!

 

[Guest]

Yeah this is a really confusing subject

If it effects potency and smell i see why you should turn it off... but it seems weird to turn it off if it doesnt,

because the plant should still need it?

i dunno, need a comparison grow

 

[MTF-Sandman]

So he says not to do it, but has no documented reason huh? Dunno about you, but that makes me doubt the knowledge of Ed...

Why the hell would you ever publish a "how to" style book without documented proof that the method are correct and why they are?

 

[Guest]

I don't know,never really noticed until this grow but I'm maybe a week from harvest and there's beginning to be no question that a week or 10 days ago,it was a whole lot stinkier in there.I've never,ever noticed this before,I dont think I ever had my co2 100% before either lol.I'm beginning to believe there may be something to it.The thing is,I always have plants at different stages,and I'd rather the stretching p[lants get the co2 and possibly lose a little odor from the nearly finished plants than cut the co2 to the plants benefitting from it.The potency isnt affected,this I know for sure.And if this thread appeared a week or 10 days ago,I'd say Ed is just plain wrong.But after the last couple days I'm not so sure.I had my vaportronic optimum 4000 with a new filter on 10 in a small room,and the plants were overpowering it.Actually,I'm glad some of the smell is dissipating.Its funny I was actually going to do a thread today wondering if anyone ever noticed a decrease in smell towards the end of flower,I didn't even consider the enrichment may be causing it.If anything I'm relieved and happy,10 days ago I about bought a can it was so bad,now it can wait till after vacation.Now that I've finally got my enrichment correct it seems there is something to this dimished smell thing,and its a good thing for me at least.Believe me,when I go to bag buds a lack of odor will not be a problem lol.And if it is,the smarter users know you dont get high on terpines anywayEDIT I just saw the part where ed says it diminishes potency,I dont buy that for half a second lol!

 

[Guest]

Shit,I only have six stretching white widows among twenty 4 ft finishing plants,I just killed the co2,fuckit.I couldn't find anything about this on google,nothing nada.Which book is this info in?

 

[Guest]

Sandman you have your co2 correct,you havent noticed anything?Thats right you use a scrubber.I'm noticing it man,pretty much no question in my mind unless this vaportronic suddenly decided to work lol.I've noticed nothing through the years,but then again you know the story,portable AC's,fear of high temps lol,you name an enrichment snafoo and I bet I experienced it!This really has me wondering,odor I can give a rats ass about the less the better as far as I'm concerned.But affecting potency?That steps over the line.I have to know the "why" on this one though,how the hell can excess co2 degrade thc?

 

[MTF-Sandman]

Nah...no difference using CO2 all the way through at my setup. I've been running a perp SOG for the last year or so, so shutting the CO2 off really isn't an option either...if anything they're stinkier, but that could be strain or setup specific.

Dunno, you want me to setup another 20k room and test it Bob?

Is that book called "CO2, Temperature and Humidity: How to Use CO2 to Increase Growth in Your Indoor Garden and Greenhouse"?

 

[Guest]

I honestly just dont know,if it werent pretty obvious I never would have noticed much less considered doing a thread on it,I just dont know man.I do know one thing,I watered yesterday,killed the propane tank adjacent to the flower room this morning,and I aint movin/wadin through those bent over trees to light my pilot light till its time to water again lol!

 

[Guest]

I'm hoping the cooler daytime temps(its 20 degrees cooler in there now) will actually help finish them nicely,regular co2 levels can only result in a minor slowdown I would think?Man I just wish this didnt happen,or I didnt notice it..EDIT If potency isnt affected its a good thing..

 

[Guest]

Whats the name of the book!!

 

[Guest]

Marijuana growers handbook

The indoor high yield guide

by Ed Rosenthal

 

[Guest]

Thanks,I guess I should have known that sounds familiar,I've never done growbooks though.Wait a minute man,I turned off my co2 this morning and you're the dumb guy smokin the alien weed right?OHHhh nooooo lol.If anyone has this book handy to confirm this cats not halleucinatin from a Saturnian sativa or somethin,I'd appreciate it lol.Just kiddin man my nose doesnt lie,somethings in the air,or not,or was..

 

[Guest]

Not one of you hippies has eds book?Man it would sure help me if someone could just write what he sayin on this subject.

 

[Guest]

Hey Alien does Ed mention lowering temps when cutting co2 enrichment?It's probably not good leaving ripening flowers in a low co2 environment with 85-90 degree temps,you think?If he didnt mention this I wonder why?Dont make me try and find this silly growbook folks,someone out there with the book help me out.

 

[Guest]

too tired to re-read right now but doesnt ring a bell

 

[Guest]

WAKE UP,damn I'm hoarse IT'S 4 in the afternoon!

 

[Guest]

Alien you were around last night when I was posting in indoor,either you dont even have the book or you dont want to take the time to help someone out,either way it makes me wonder WTF you're doing here?You post something,say there no real info to back it up,then wont even post what was said in the first place lol.Thanks fer nutin honey!

 

[Bongstar420]

Interesting. All that 30% of the weight coming on in the last 2 weeks isn't CO2? I might believe that for nutrients (but only half way), but for CO2 assimilation- that's a sell.

Does anyone consider the proposed loss in terpene content is from the +86f temps people use with CO2? Everything grown above 85f is less tasty than the 75-83f stuff to my observation.

I don't see why Ed's popular status makes him an adept scientist. In fact, I see popularity as contrary to scientific standing in many cases.

I have a book that explains why the CO2 is cut off during the last 2 or 3 weeks of flowering,

They say

1) Excess CO2 late in flowering lowers aromas and potency
2) During the last 2-3 weeks of flowering the plant is basically done with growth and just ripening the buds, therefor the CO2 is not used by the plant.

Of course they said the exact reason is not documented or known but these were his guesses.

The man who wrote this book is the legendary Ed Rosenthal! I trust his word

Edit: Although I have read people's posts on here saying they run CO2 all the way to harvest and have no aroma or potency problems, so I find it hard to believe the CO2 late in flowering effects them THAT much but maybe still slightly. We need someone to run a side by side comparison if ya ask me

 

[Granger2]

I wouldn't expect Ed Rosenthal or Jorge Cervantes, who have a high public profile, to admit to ever having grown herb. -granger