Can anyone share their CO2 chart for ppm and temps??

[pacoclandestino]

Hi guys


Just starting to build my first CO2 enriched (sealed)room and i need some help regarding the amount of CO2 I should have in the room for each stage.


I am aware depending on genetics and other factors there will be variations, so, i am looking forward to hear how you guys do it and your experiences regarding it


Many thanks

 

[St. Phatty]

Hi guys

Just starting to build my first CO2 enriched (sealed)room and i need some help regarding the amount of CO2 I should have in the room for each stage.

I am aware depending on genetics and other factors there will be variations, so, i am looking forward to hear how you guys do it and your experiences regarding it

Many thanks

Been using CO2 for about 25 years but never made a chart.

I use 1/3 pound of sugar in about a gallon of warm water for a veg room. (+ active dry yeast + champagne yeast)

Maybe a full 2 pounds of sugar in 2 gallons of water for a flowering room.

Tried a sealed room once but only got med. quantities out of it (enough for one person).

 

[Bobby Boucher]

I think taking it over 900 is a waste unless you are blasting all the other parameters. At least that's what I remember reading in some place or another.

I've also heard people say that they match their co2 ppms with their feed ppm's.. but you hear a lot of crazy things on the internet..

If you are using a burner, more co2 = more heat, more oxygen depletion, more ethylene buildup, harder wear on burner tips, and probably a higher likelihood of solenoid failure. Not to mention.. co2 controllers are expensive and generally unreliable, ime.

Better off using a timer to set your burners and tanks off.

Here's my watercooled lp co2 generator.. I've been using different iterations of this for years but this little guy really pumps out the co2 minus all the heat.

lulz.. I figured I'd just create as small of a blue flame as I could with a valve and skip the timers and controllers all together.

 

[Grapefruitroop]

For what I read around there are many opinions in regard the way and the effectiveness of Co2 enrichment for plants....

For me made sense enough to run it at 1500 ppm with room temp (Led lights) at 28C day and 26 night...

Between many contradicting info seems common agreement that Boost Co2 may increase yield only if paired with a lot of light and a little bit higher temps than normal...and of course everything else well dialed in...

To me never made sense adjusting the ppm according to the growth stage...I also have access to cheap bottled co2 near by so....

 

[RockinRobot]

I have ended up with deficiency issues any time I have gone above 1000ppm. I'm only running 600w lights though so more light may allow higher CO2 levels. You will definitely need to increase temps and feed levels when running CO2. Increasing temps causes the plants to drink more by increasing transpiration.

I read somewhere to match feed ppm to CO2 ppm but that article didn't say wether it was .5 or .7 scale for ppm on feed. I run 2ec 1000ppm @.5 scale and seems to work out with my 1000ppm CO2 level.

 

[pacoclandestino]

Hi everyone!!!
Many thanks for your valuable info


Let me xplain:

I will be using CO2 from tanks, no burners.Using a Techgrow T2 controller + S4 sensor

Sealed room, only a fan and filter as a scrubber inside the room

Lights:
2 X Fluence SPYDR 2i LED light
2X Dimlux 630(max 760W) LEC lights

1x Spilt AC
1 X Dehum

For what I read around there are many opinions in regard the way and the effectiveness of Co2 enrichment for plants....

For me made sense enough to run it at 1500 ppm with room temp (Led lights) at 28C day and 26 night...

Hi mate
So you go 1500 ppm at 28/26ºC all the way from veg to harvest?what about your RH?

is your room totally sealed?


Many thanks guys, hopefully next week will start puting the CO2 system in place and start testing it, can´t wait

 

[RockinRobot]

If the room isn't sealed you may as well forget CO2. Run vents during lights out only if you're planning to vent at all.

 

[Asslover]

Been using co2 tanks in sealed rooms for about 10 years now. Multiple rooms, all 10 x 10, 4K hps watts, fully sealed, minisplit,,dehuey, etc. I used an 8 y/o Hydrogen co2 monitor that I modified to keep co2 levels between 700-1100ppm. I keep my room temps @ exactly 82. Humidity fluctuates between 50-60%.
And their is such a thing as too much co2; I have a friend who’s cos regulator got stuck open and dump a whole 20lb tank in 2 days. He had so many deficiencies that he had to break down and start again.
Co2 does wonders in a failed in room with healthy plants! Good luck ��

 

[Absolem]

From a member here who I highly respect.

https://www.icmag.com/ic/showthread.php?t=221893

High,

I haven't posted much lately, but I thought this topic was important enough to write a thread. I have written about this topic quite a lot in the past, but I have never made a thread just for this topic.

My goal: to try and kill the myth that 1,500 ppm CO2 is ideal. I want to get it known in the cannabis world, that it's important to not use > ~1,100-1,200 ppm CO2.

In short, the claim that 1,500 ppm CO2 is ideal for cannabis is total hogwash. I challenged anyone a while ago to find a single scientific study showing 1,500 ppm is ideal for C3 flowering plants, or even just to find the reasons why it's claimed 1,500 ppm is ideal in the cannabis world. I assume the myth (yet another!) came from the liked of Ed Rosenthall or George Cervantes or Mel Frank, etc.

If there is interest in the 'whys' I can explain why it's important to not use > 1,200 ppm, ideally we would use ~1,000-1,100 ppm. The effects from "super-optimal" CO2 concentrations range from reduced rate of photosynthesis, to reduced yield, reduced root growth, reduced stomatal openness, increased photorespiration, etc. In other words, nothing good.

The reason why we should ideally use ~1,000 ppm, is for most C3 species (and C4 I think), CO2 "saturation" occurs at ~1,000-1,100 ppm. That means more than ~1,100 ppm (up to 1,200 ppm) isn't going to help the plants, it's only going to waste CO2 and hinder plants if CO2 is about > 1,200 ppm.

The reason why we should ideally use < 1,200 ppm CO2 is the effect high (super-optimal) CO2 has on "Rubisco activase", the substance that turns inactive "Rubisco" into active Rubsico. At CO2 > ~1,200 (and temp > ~89'F) Rubsico activase is inhibited, which in turn inhibits conversion of inactive Rubisco into active Rubisco. And active Rubisco is needed for high rate of photosynthesis, which in turn leads to high growth rates and high yield, etc.

So, to sum up: It's important to keep CO2 below ~1,200, and to be safe and most efficient, keep CO2 at ~1,000 ppm. Night time CO2 should be < ~500 ppm, unless one is trying to reduce dark respiration and stretch, then upwards of 750 ppm can be used for short periods (otherwise leaf chlorosis can set in).

I can fully cite all those claims, if anyone wants to read the academic lit. For now, here are a few good studies looking at C3 wheat and rice plants:

• Note: 0.0001% CO2 = 1 ppm CO2 = 1 micromole mol^-1 CO2 (mol^-1 is written as "mol-1" below)

CO2 crop growth enhancement and toxicity in wheat and rice
Bugbee B, Spanarkel B, Johnson S, Monje O, Koerner G.
Adv Space Res. 1994 Nov;14(11):257-67.

Super-optimal CO2 reduces wheat yield in growth chamber and greenhouse environments
Grotenhuis T, Reuveni J, Bugbee B.
Adv Space Res. 1997;20(10):1901-4.

Very high CO2 reduces photosynthesis, dark respiration and yield in wheat
Reuveni J, Bugbee B.
Ann Bot. 1997 Oct;80(4):539-46.

Super-optimal CO2 reduces seed yield but not vegetative growth in wheat
Grotenhuis TP, Bugbee B.
Crop Sci. 1997 Jul-Aug;37:1215-22.

 

[pacoclandestino]

Been using co2 tanks in sealed rooms for about 10 years now. Multiple rooms, all 10 x 10, 4K hps watts, fully sealed, minisplit,,dehuey, etc. I used an 8 y/o Hydrogen co2 monitor that I modified to keep co2 levels between 700-1100ppm. I keep my room temps @ exactly 82. Humidity fluctuates between 50-60%.
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Thanks mate! regarding the fluctuation(700-1100 ppm) i guess it depends on what stage you are? could you please elaborate a bit more on what ppm on each stage(clone,veg,flower)?

From a member here who I highly respect.
https://www.icmag.com/ic/showthread.php?t=221893

I did have a read, good article, what am not sure is with today lights and the intensity you manage if you might be able to go higher on CO2.
I will be running 2X 760w Dimlux LEC lights( 1411 umol/s) and 2 X 630 Fluence Spydr 2i LED lights( 1700 umol/s)

 

[Asslover]

No co2 in veg room, only in the flower rooms.
The ppm fluctuation is because of the controller I use, it only has setting for 500-700-900-1100-1500. Results were the same with 1100 vs 1500 so I set it there. I felt 500 was too low for a room my size so I set it to come on when it goes below 700.

 

[Grapefruitroop]

Sorry OP i totally forgot this post....
yes 1500 all the way...
my Rh is 68-72 in veg and 55-61 in flo
yes totally sealed with bottled co2....
but
Due to this confinement i already lowered the levels to 1200 and now that im switching my last tank im gona set it at 800 just to make sure to make it till the end of the cycle....
Between the bright light and the high level of co2 i was always chasing deficiencies....the last run not that bad ..lets see how it will go this time with lower co2 levels...almost half..

 

[PurplePotion]

1000ppm seems to be the sweet spot. I wouldn’t go any higher until you are 100% comfortable with every other parameter and have completed several successful runs. (Lesson learned, hindsight is 20/20).

 

[pacoclandestino]

Sorry OP i totally forgot this post....

1000ppm seems to be the sweet spot.......

Right on time guys, i started the grow around 20 days ago ,grow diary is being published every few days you are welcome around there also. Still havent needed any CO2 yet, but will start very soon.Thanks for the advice

 

[Lost in a SOG]

You've gotta watch those night time co2 levels.. after lights out the plants dump out a load of co2 and unless you can shift it from a sealed room somehow,, kinda difficult without pumping it out,, it can sit at an uncomfortable level for them all night.

 

[PurplePotion]

You've gotta watch those night time co2 levels.. after lights out the plants dump out a load of co2 and unless you can shift it from a sealed room somehow,, kinda difficult without pumping it out,, it can sit at an uncomfortable level for them all night.

Interesting point. Do we know the true ramifications of Co2 build up at night time? I’ve never known it to be a real issue honestly.

 

[Lost in a SOG]

My guess would be it retards respiration.. i fixed my issues i had at one point by doing so and supposedly under 500ppm at night is better for them..

Ive seen my ppms climb up to 900 at night from them respiring and Ive also seen peeps say it doesnt effect their grows but that could be due to other factors i guess, still it makes sense that good night time respiration is as importent as photosynthesis

 

[pacoclandestino]

You've gotta watch those night time co2 levels.. after lights out the plants dump out a load of co2 and unless you can shift it from a sealed room somehow,, kinda difficult without pumping it out,, it can sit at an uncomfortable level for them all night.

My room is sealed, but I already had a very good exhaust system in place(filter,silencer,soundproofed tubing,ozone machine etc)so I left it there,and before I go to work, wich is after my plants go asleep, i do switch it on until CO2 is under whatever dose am using while awake. Also since am not sure how my house is going to smell with a sealed room inside,I rather have the option of the exhaust+filter+ozone going outside the house, just in case

 

[Raw710]

After reading the forum you have to feed your plants a higher ppm or EC? I Just installed a 10 burner and was wondering why my plants started having deficiencies I have never seen before. I have been doing the same nute temp humidity lights for the past 3 years and never had a problem until I recently implemented co@. If anyone could confirm that I would really appreciate it. Thanks

 

[Asslover]

You've gotta watch those night time co2 levels.. after lights out the plants dump out a load of co2 and unless you can shift it from a sealed room somehow,, kinda difficult without pumping it out,, it can sit at an uncomfortable level for them all night.

Nighttime co2 doesn’t affect them at all.