CO2 consumption rate of cannabis....

[ShLUbY]

Thank you, that's what I figured. I have over done with just water and molasses. Seemed like the micro herd must of been on overdrive because I had some deficiencies

my only use for molasses is when i brew a tea, which is very seldom. bacteria don't need our help once they're inoculated, especially if you topdress compost once or twice during the grow for re-inoculation. if you brew a tea, brew a fungal one. a good soil has everything it needs, and topdressings definitely help them get through flower. I'm working on making a slightly stronger mix just to see how much it can be pushed so I don't have to topdress anymore. usually i run stuff at 1/2c per cu.ft. for amendments, but i just made a mix with 2/3c per cu.ft. (except oyster shell) and if that goes well with no adverse effects, i'm gonna make a 1c per cu. ft (except the oyster shell). and see what happens. current amendments are neem meal, kelp meal, crab meal, fishbone meal, gypsum, oyster shell, alfalfa (i go a little lighter on this), greensand, and rock dust. I've been using bloom blends in flower, organically done bloom has been working, but i'm gonna try and make a blend of dried ground banana peels, fishbone meal, kelp, gypsum, and crab meal for bloom this weekend or next weekend and see how it works on the current run.

 

[reallybigjesusfreak]

Gavitas, running them full blast. They run hot as hell but makes up for it by pushing the plants. 5,000 btu per lamp when you factor in dehumidifier and also if ambient temps outside your room get warm.

Thanks for the response. I've been looking to make the switch, but from what I've read, all the one's in air cooled hoods are essentially garbage since they shouldnt be air cooled, and that they will all run hot as hell. In which case, you should focus on cooling your whole tent, not just the lights at that point. is that pretty much correct?

starting to think i might be better suited for a single ended unit.

 

[kingzt]

my only use for molasses is when i brew a tea, which is very seldom. bacteria don't need our help once they're inoculated, especially if you topdress compost once or twice during the grow for re-inoculation. if you brew a tea, brew a fungal one. a good soil has everything it needs, and topdressings definitely help them get through flower. I'm working on making a slightly stronger mix just to see how much it can be pushed so I don't have to topdress anymore. usually i run stuff at 1/2c per cu.ft. for amendments, but i just made a mix with 2/3c per cu.ft. (except oyster shell) and if that goes well with no adverse effects, i'm gonna make a 1c per cu. ft (except the oyster shell). and see what happens. current amendments are neem meal, kelp meal, crab meal, fishbone meal, gypsum, oyster shell, alfalfa (i go a little lighter on this), greensand, and rock dust. I've been using bloom blends in flower, organically done bloom has been working, but i'm gonna try and make a blend of dried ground banana peels, fishbone meal, kelp, gypsum, and crab meal for bloom this weekend or next weekend and see how it works on the current run.

What do you think of high brix gardening? I added doc high brix mix to my current soil. I been testing the levels and they're staying around 12 which is alright but I was hoping higher. My babes have what looks like a mag deficiency which is confusing with how much frass and gypsum I have in my mix. It might be from water logged issues but I'm not positive.

My last soilles harvest was in coco and was only testing at 8. I don't really like coco anymore and my next soilless run will be promix. I'm hoping to get my levels higher in this soil run.

 

[ShLUbY]

What do you think of high brix gardening? I added doc high brix mix to my current soil. I been testing the levels and they're staying around 12 which is alright but I was hoping higher. My babes have what looks like a mag deficiency which is confusing with how much frass and gypsum I have in my mix. It might be from water logged issues but I'm not positive.

My last soilles harvest was in coco and was only testing at 8. I don't really like coco anymore and my next soilless run will be promix. I'm hoping to get my levels higher in this soil run.

I’ve never paid attention to brix. Healthy plants will have high brix. Just get em as healthy as possible is my philosophy, which means get the soil as complete as possible.

If you think u have mag def. try coconut water. 1/4c per gallon.

 

[kratos015]

ShLUbY,

I can't comment on a tank as I'm running a propane CO2 set up. It's a 7 gallon propane tank and it will usually last me 2 weeks on average in 18/6 and 2-3 weeks in 12/12. Amazon has a great controller that only runs $200 and I can't recommend it enough. Had it over a year now and absolutely zero issues with it.

Something I found out the hard way about CO2 though, is that your plants will use a lot more Mg and K than usual. K+Mg play a major role in photosynthesis, and since more CO2 = more photosynthesis I found that I had K+Mg deficiencies popping up around week 3-4 of flower. Took me a while to troubleshoot that one. CO2 is a learning curve for sure, but a very rewarding one. I foliar feed with ProTekt and Epsom salt every other day or two to compensate for the extra K/Mg being used by the plants. I cut off the CO2 and foliar feeds at around week 6, as ethylene will start to build up and prevent ripening. In fact, I've been told that semis that run produce have CO2 generators in them to build up ethylene inside the trailer to avoid the produce from ripening before they hit the stores.

HTH

 

[TintEastwood]

I run two sealed rooms with bottles and maybe can help you out. I have the Autopilot controllers. Consumption depends a lot on how sealed you get your room as well as what phase the plants are in. My ambient is usually around 400ppm but keep the room around 800ppm until the last few weeks I stop giving any and let it run at ambient (mostly because I don't see the plant using any CO2 for swell.)

Once my room was finished, I put the gas up to 1000 ppm with an empty room and came back 24 hours later and it was around 950. Im fairly sure my door isn't as sealed as it was when I finished it.

I see my plants using around 100-200ppm an hour during heavy growth with a similar footprint as yours.

My soil produces a good amount of CO2 and I use the bottle to supplement as well but it is hard to quantify, so Im sure that number is probably much more for a hydro grower in terms of consumption.

My bottles have been lasting about 2-3 months.

Hi NaturalFarmer. Curious if you are doing regular fresh air exchanges on your sealed room C02 environments. Lights on and or lights out, how often. I run a bottle as well, my concern is low oxygen level. I run a max of 1200ppm.
Thanks

 

[NaturalFarmer]

Hi NaturalFarmer. Curious if you are doing regular fresh air exchanges on your sealed room C02 environments. Lights on and or lights out, how often. I run a bottle as well, my concern is low oxygen level. I run a max of 1200ppm.
Thanks

I run two sealed rooms but both are attached to each other. I can exchange air in between the two rooms but no air intake from outside. Oxygen isn't a concern IMO provided you have the quantity of plants to cycle the CO2. The oxygen is the byproduct of photosynthesis. The more CO2 and water used, the more O2 available.

 

[Uncle ted22]

Hey, This is my first grow but I went with a sealed room with co2. I’m using 20lb tanks with an auto pilot controller. I ran 800 ppm for 35 day veg and I am currently running 1500ppm for flower. I’m at day 25 of flower and have used 5 20 pound tanks, just hooked number 6 up today. Local welding shop fills for 27$. Not sure if I am on track for a sealed room but I am impressed with these plants. I have 12 plants in a 10x12 room. 10 leds lights total. A mix of king led and advanced diamond series. I Have blue dragon, Alian OG, and super skunk. Only thing I’ve noticed is the alien og buds seems to be a little behind, but they grew another foot when the other strains stopped when I switched to flower? Let me know what you think. First pics are dragon and skunk last 2 are the AOG.

 

[athomegrowing]

https://www.ncbi.nlm.nih.gov/pubmed/11540191

A CO2 level of 1,200 to 2,000 ppm will increase the growth of your plant significantly. When using CO2 your plants can handle a higher average temperature – around 85-90 degrees Fahrenheit.

 

[dstroy]

 

[jjng5]

@Uncle ted22 Six tanks in 25 days?! $162 in gas not even half way thru flower yet? Are you guys using sealed tents!? I cannot understand how some burn through 20 pounds of CO2 in days...?!

 

[jjng5]

Why do folks mess around with yeast and baking soda for CO2 production. They do not produce enough CO2 to make a measurable difference. Just something to waste money on...

 

[Uncle ted22]

@Uncle ted22 Six tanks in 25 days?! $162 in gas not even half way thru flower yet? Are you guys using sealed tents!? I cannot understand how some burn through 20 pounds of CO2 in days...?!

No, 40 days of veg now on day 30 of flower. 70 days on the 6th tank. Room is sealed decent, but I was in and out more then I will be from here on out getting all the kinks worked out of room. Figured 8-9tanks will do the whole grow. 220-250$ seems like a no brainer to me. around here that’s only a zip or 2 to break even.

 

[Uncle ted22]

View attachment 4305777

No, 40 days of veg now on day 30 of flower. 70 days on the 6th tank. Room is sealed decent, but I was in and out more then I will be from here on out getting all the kinks worked out of room. Figured 8-9tanks will do the whole grow. 220-250$ seems like a no brainer to me. around here that’s only a zip or 2 to break even.

Well to be realistic it’s no where near 220-250$ because I’ve had to run a split unit AC all winter even with below zero temp. My dehumidifier runs constantly.....Then at night when I dump the room the heat kicks on. Plus the autopilot controllers....I just wanted to start right off trying To grow the best flowers i could.‍

 

[TintEastwood]

Hey, This is my first grow but I went with a sealed room with co2. I’m using 20lb tanks with an auto pilot controller. I ran 800 ppm for 35 day veg and I am currently running 1500ppm for flower. I’m at day 25 of flower and have used 5 20 pound tanks, just hooked number 6 up today. Local welding shop fills for 27$. Not sure if I am on track for a sealed room but I am impressed with these plants. I have 12 plants in a 10x12 room. 10 leds lights total. A mix of king led and advanced diamond series. I Have blue dragon, Alian OG, and super skunk. Only thing I’ve noticed is the alien og buds seems to be a little behind, but they grew another foot when the other strains stopped when I switched to flower? Let me know what you think. First pics are dragon and skunk last 2 are the AOG.
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These are Alien OG from clone. Day35ish.
First time for this strain so I don't know it's growth traits. I just hope it's potent.




That's a lot of gas, but your room is larger and more plants.
I get about 30 days out of a 20lb. bottle. 4x8 8ft ceiling running average of 1000ppm. Autopilot GHM.

What is the benefit of dumping your room at night? Ty

 

[jjng5]

In a 20 pound CO2 tank there is 175 cu feet of gas. At 1000 PPM in a 5x5 grow tent would fill the fent 1750 times -- even if you filled your tent 10 days per day, calculations say it would last more than 5 months per tank

 

[jjng5]

What is the benefit of dumping your room at night? Ty

High CO2 at night can harm plants and turn them yellow.

 

[Uncle ted22]

I also dump mine to lower the humidity. It’s cheaper to run my exhaust fans then it is my dehumidifier all night. vents close, fans shut down, both scrubbers turn back on and the co2 is turned back on 30 minutes before lights come back on. Also have the co2 shutting off 30 minutes before the lights go out because there is plenty left in the room for the plants, I should probably have it shut off earlier to save on some c02. I’m happy with how much I’m using at this point because of my setup. It’s in a very old house and when i build a new one it will be easier to seal up better. I’m also running higher PPMs then you. I was at 8-1200 for veg and currently running 15-1700. Your AOGS look good, i have 5 AOG in flower right now too. I had no idea they were such heavy hitters when i bought the clones....exciting. Here is my AOG on day 31 definitely slower then the other strains but i think it’s going to take 1-2 weeks longer then others.

 

[TintEastwood]

Uncle.
Very nice system you have setup.
Based on my clone source, this wifi alien will take 8 or 9 weeks.
Best of luck on all your grows.

 

[DemonTrich]

In a 20 pound CO2 tank there is 175 cu feet of gas. At 1000 PPM in a 5x5 grow tent would fill the fent 1750 times -- even if you filled your tent 10 days per day, calculations say it would last more than 5 months per tank

Your not taking into account how much co2 the plants uptake.