How much does it cost to fill a room with CO2?

TheYokel said:

You need to give the plants time away from the enriched co2 as well. and I don't just mean venting

Granted yields are proven to go up 10-15% in the correct environment. But ferulic acids and flavonoids are also proven to decrease if certain plants are over-exposed to co2 enriched environments. I'm sure no scientists have used cannabis in particular yet to test, but:

http://www.sciencedirect.com/science/article/pii/S0031942204002651

they have tested it with other herbs. If you pump your room past their optimum point, sure, you will still get bigger yields...

but your buds won't have the same smell and flavor profiles.

add co2 as a supplement...

and you don't need 1500ppm... seriously, your plants won't be using that much. it can even be toxic...

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

read more about your new co2 addiction before trying to dive to deep.

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Very interesting post. Thank you for the information. I will certainly do more research about this matter.

I go through about 33lbs roughly of propane per grow thats pumping 1500ppm in 12x8x9 room and .after flower i put propane tank on grill and i have cooked with it prob 15 or 20 times so far so

TheYokel said:

You need to give the plants time away from the enriched co2 as well. and I don't just mean venting

Granted yields are proven to go up 10-15% in the correct environment. But ferulic acids and flavonoids are also proven to decrease if certain plants are over-exposed to co2 enriched environments. I'm sure no scientists have used cannabis in particular yet to test, but:

http://www.sciencedirect.com/science/article/pii/S0031942204002651

they have tested it with other herbs. If you pump your room past their optimum point, sure, you will still get bigger yields...

but your buds won't have the same smell and flavor profiles.

add co2 as a supplement...

and you don't need 1500ppm... seriously, your plants won't be using that much. it can even be toxic...

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

read more about your new co2 addiction before trying to dive to deep.

Click to expand...

It can also prlong flowering time.

A lot of people stop Co2 enrichment with around 2-3 weeks left of flowering time.



J

anzohaze said:

I go through about 33lbs roughly of propane per grow thats pumping 1500ppm in 12x8x9 room and .after flower i put propane tank on grill and i have cooked with it prob 15 or 20 times so far so

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That's like the Everlasting Gobstopper of propane tanks.

Hank Hill would have a hard-on...

I read that co2 should only be around 1000ppms and that 1500 was generally unecessary.

But wat about temps/hum? There's alot of disagreement of how hot and wet it shud be.

Sir KK

Another thing you could do is just run a space heater in the room that's thermostat controlled.

It probably wouldn't cost you as much in electric to run when required as the investment in the propane setup would cost.

Didn't you suffer with high RH at one point?

Couple of Dehumidifiers would raise the temp too.

That's what I generally use my Dehumidifier for and with the colder weather comes the higher RH.



J

I keep mini split at 80degrees and room stays between 78-82 roughly at night time i drop down to.mid 60s. I also run co2 the last week or 2 of veg just to work them.up to the higher ppm. I have a generator and a propabe tank is 22 dollars to fill or swap out so 30 dollars a grow after initial ourchases or generator sniffer etc

jondamon said:

I'm sure we've had a similar conversation in PM's.

My advice still stands.

Maximise the potential in your room as it stands without any additional investment.

When you're hitting 1-2gpw out of your room without adding Co2 and you can't seem to break above it then contemplate Co2.

Or if you have a hard time controlling high temps due to location then consider sealing your room and controlling everything.



J

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I echo this, typically large amounts of CO2 don't always give you large results, unless you have a VERY high amount of lumens and everything else is perfectly dialed in.
I understand you need heat, and in that regard a co2 burner is a great solution, but what kind of lights do you have?
Only reason I ask, is most grow-rooms don't need co2, more hassle than it's worth, a good ventilation setup is usually better. Like I said, if you need it for heat, that's different, but I wouldn't stress too much in trying to get 1500ppm.
my opinion anyways

Kush Killington said:

Its jus one of those small 5 gallon tanks yu can get outside of home depot and some 7-11s.



Im confused here. In a sealed room, yu shud only have to "fill" it with co2 once a day (in the morning when lights first come on). After that you shud only need to top it off. My gen comes on everytime the ppms drop to like 900-950. Its on for like 30sec tops and then its off. Not really sure how many times it cycles on each day but i can here it fire up from my living room. Sounds like it comes on once every hour or so.

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Sir KK[/QUOTE]

How high do your lights on temps get? Mine (when I ran gas) never went over 86F. At 86 the grow exhausted and everything restarted. I ran enviro controllers to keep my temps and RH in check!

Helmut79 said:

https://www.rollitup.org/t/how-often-to-generate-new-co2.427285/

According to this thread, I've found people suggesting different things - different opinions about how often to generate new co2.
Opinions varied from every 20 minutes to every 66 minutes (off time).
This calculator does not calculate the "off time", but it does calculate an "on time" for you: http://www.hydroponics.net/learn/co2_calculator.asp
I did find out what my on time is, which is 30 minutes.
Now started researching about the "off time" and this is how I found out about the thread that I linked.
One cycle consists of "on time" + "off time".
"On time" means it's when the gas is being released and "off time" means it's the amount of time it takes to start releasing gas again (in my logic).
So according to these people opinions, my cycle takes 50-96 minutes.
Every 50 to 96 minutes the gas is being released for 30 minutes at a time (off time being 20-66 minutes).
Oh well, according to my calculations the fuel consumption is going to be 5-10 L per day.

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The formula's you ask for I gave on your other posting about gas in veg.

A few things people forgot to mention on o2 Generators....
For every gallon of gas you burn you put 1.642 POUNDS of water into your atmosphere!

Now you have to get rid of that with added dehumidifying. You will need to have a catch tank and pump the excess water out as you will not be able to keep up with even a 70 pint dehumidifier.

And YES, you should stop running the gas 2 weeks before you finish in bloom as the gas will inhibit the ripening of the buds otherwise.

greasemonkeymann said:

I echo this, typically large amounts of CO2 don't always give you large results, unless you have a VERY high amount of lumens and everything else is perfectly dialed in.
I understand you need heat, and in that regard a co2 burner is a great solution, but what kind of lights do you have?
Only reason I ask, is most grow-rooms don't need co2, more hassle than it's worth, a good ventilation setup is usually better. Like I said, if you need it for heat, that's different, but I wouldn't stress too much in trying to get 1500ppm.
my opinion anyways

Click to expand...

I like to grow with 1000W HPS lamps.

Dr. Who said:

A few things people forgot to mention on o2 Generators....
For every gallon of gas you burn you put 1.642 POUNDS of water into your atmosphere!

Now you have to get rid of that with added dehumidifying. You will need to have a catch tank and pump the excess water out as you will not be able to keep up with even a 70 pint dehumidifier.

And YES, you should stop running the gas 2 weeks before you finish in bloom as the gas will inhibit the ripening of the buds otherwise.

Click to expand...

Thank you for the information. I have been recommended to choose a dehumidifier by the capacity of 4-5 gallons per 1000W of light, when using co2 in a sealed room.

Dr. Who said:

A few things people forgot to mention on o2 Generators....
For every gallon of gas you burn you put 1.642 POUNDS of water into your atmosphere!

Now you have to get rid of that with added dehumidifying. You will need to have a catch tank and pump the excess water out as you will not be able to keep up with even a 70 pint dehumidifier.

And YES, you should stop running the gas 2 weeks before you finish in bloom as the gas will inhibit the ripening of the buds otherwise.

Click to expand...

where did you read about turning off gas with 2 weeks to go?

a mongo frog said:

where did you read about turning off gas with 2 weeks to go?

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I read about the use of Co2 in college textbooks. I also have tried it myself.

High Co2 levels during the last 2-3 weeks of bloom, inhibit Ethylene gas production from the plant. Ethylene gas is the ripening agent that promotes an on time finish. The gas is produced all through out the bloom stage and increase's as time goes on.

There is debate among Cannabis growers as to if this is true for cannabis. I strongly support the YES side. you see as long as I used gas, I found out quite quickly that if I kept running the gas past week 6-10 (strain dependent), you will get added weeks of ripening time. When I stopped the gas use at the last P&K spike. I did NOT get the extra weeks of ripening.

By not producing ethylene gas the plant will take weeks more to finish. During these "added weeks" of bloom the plant will NOT increase in size or yield. You are therefor spending money on added nutrient, gas, electricity and water,,,,,not to mention your time and all for NOTHING!

Ethylene gas is used by most flowering and fruiting plants to ripen the flowers or fruit. It's what makes banana's go black and strawberries turn to moldy mush.