COBS and gas (co2)...

Tried searching for cob and co2 grows...cant seem to find any...
is anybody doin it?
How are you doing it?
And how are your results?

I just renoed my basement... and now that it is all done i realize the monster closet i built to put all my junk in is probably the best option for growing...lol

The con is...limited access to make ventilation work. The pro is... it is a perfect sealed room option...
And during 8 years of growing i have always wanted to try a sealed room set up with the gas and full on hydro...

So lets dicusss...

Nobody is doing or has done cobs and gas? Really?

Just build a sealed room in the room you have I bet it would be like $200 at most if your throwing down enough light it should increase yield

Grand Master level uses co2 with quantum boards he has a bunch of videos

Ryante55 said:

Just build a sealed room in the room you have I bet it would be like $200 at most if your throwing down enough light it should increase yield

Click to expand...

Not too worried about the costs....did the math roughly...

Im interested to see how guys have set it up... and what adjustments they may have made switching from whatever lights they made before.

I grew in promix before with hps and when i switched to cob i had to adjust nutes quite a bit before i dialled in...

There is no problem with using LED with CO². You can do this in different ways from yeast sugar bottles to pure CO². But in a sealed room you would need at least a dehumidifier, probably a small AC! Its pretty easy to keep a CO2 level but to keep the VPD in check in a sealed room thats not so easy.

Ive been growing for 16 years and have never NOT used c02. I tend to use a ton of light (1200 - 1950 led watts per 4x.

I use hot co2 and air conditioners though. 1650 ppm c02 and upto 1650 ppm nutrient solution for the last 2 weeks. I also veg with co2, at 1650 ppm co2 as well.

Veg with 1200 ppm nutes and 1650 c02
Bud from 1200ppm nutes up to 1650ppm, and 1650 ppm c02.

This is obviously really aggressive, adjust if needed.

You can check out my insta at @bcblondesgrowlights or my youtube channel https://www.youtube.com/channel/UCvk2tFI5EnFPwLPQ1-dGBrA to see the kinda stuff i grow.

What kind of co2 are you thinking of using? cold from a compressed welders bottle? I dont sugest the yeast/sugar solution as ive tried this in a small room and it only raised the room co2 by about 100 ppm (checked with a proper c02 monitor) and i had 4 or 5 of those lame 2 liter bottles from the grow store.

To do it properly i recommend you use ac and dehumidifiers....

I use tanks with a regulator, master controller with atmospheric control. If done right, you should see gains with enrichment to 1500 ppm... aside from the already increased cal mag requirements that cobs presented, I did not notice any drawbacks...

pirg420 said:

Ive been growing for 16 years and have never NOT used c02. I tend to use a ton of light (1200 - 1950 led watts per 4x.

I use hot co2 and air conditioners though. 1650 ppm c02 and upto 1650 ppm nutrient solution for the last 2 weeks. I also veg with co2, at 1650 ppm co2 as well.

Veg with 1200 ppm nutes and 1650 c02
Bud from 1200ppm nutes up to 1650ppm, and 1650 ppm c02.

This is obviously really aggressive, adjust if needed.

You can check out my insta at @bcblondesgrowlights or my youtube channel https://www.youtube.com/channel/UCvk2tFI5EnFPwLPQ1-dGBrA to see the kinda stuff i grow.

What kind of co2 are you thinking of using? cold from a compressed welders bottle? I dont sugest the yeast/sugar solution as ive tried this in a small room and it only raised the room co2 by about 100 ppm (checked with a proper c02 monitor) and i had 4 or 5 of those lame 2 liter bottles from the grow store.

To do it properly i recommend you use ac and dehumidifiers....

Click to expand...

I have a good sized dehuey already from my last space. Im looking for a good mini split for the space though....

GreenTools said:

I use tanks with a regulator, master controller with atmospheric control. If done right, you should see gains with enrichment to 1500 ppm... aside from the already increased cal mag requirements that cobs presented, I did not notice any drawbacks...

Click to expand...

Atmospheric control?
Does that run a/c, co2 and dehuey altogether or something?

pirg420 said:

Ive been growing for 16 years and have never NOT used c02. I tend to use a ton of light (1200 - 1950 led watts per 4x.

I use hot co2 and air conditioners though. 1650 ppm c02 and upto 1650 ppm nutrient solution for the last 2 weeks. I also veg with co2, at 1650 ppm co2 as well.

Veg with 1200 ppm nutes and 1650 c02
Bud from 1200ppm nutes up to 1650ppm, and 1650 ppm c02.

This is obviously really aggressive, adjust if needed.

You can check out my insta at @bcblondesgrowlights or my youtube channel https://www.youtube.com/channel/UCvk2tFI5EnFPwLPQ1-dGBrA to see the kinda stuff i grow.

What kind of co2 are you thinking of using? cold from a compressed welders bottle? I dont sugest the yeast/sugar solution as ive tried this in a small room and it only raised the room co2 by about 100 ppm (checked with a proper c02 monitor) and i had 4 or 5 of those lame 2 liter bottles from the grow store.

To do it properly i recommend you use ac and dehumidifiers....

Click to expand...

I plan to use tanks... its a small space. 8x7 x 7. I have enough light i think. Ill use the space as an 8x4 under 4 of Tasty LEDs cob bars. 1300 wt total. Cree 3590s...

When you switched from hps to led... did you have an struggles aside from added calmag needs? Any other adjustments? Or pretty smooth transition?

Gquebed said:

Atmospheric control?
Does that run a/c, co2 and dehuey altogether or something?

Click to expand...

It's a controller unit that shuts off the cow regulator and turns on exhaust fans when rH/temperature gets too high. Once those 2 are back within range, the fan shuts down and co2 regulator opens back up...

GreenTools said:

It's a controller unit that shuts off the cow regulator and turns on exhaust fans when rH/temperature gets too high. Once those 2 are back within range, the fan shuts down and co2 regulator opens back up...

Click to expand...

Is that a must or just convenience?

I was thinking for a small space i could get away with just a/c and a dehuey???

Gquebed said:

I plan to use tanks... its a small space. 8x7 x 7. I have enough light i think. Ill use the space as an 8x4 under 4 of Tasty LEDs cob bars. 1300 wt total. Cree 3590s...

When you switched from hps to led... did you have an struggles aside from added calmag needs? Any other adjustments? Or pretty smooth transition?

Click to expand...

ya more cal mag and more nutes in general, other than that, should be awesome bro cant wait to see some pics

need your temps up (80f+) to see benefits from running co2.......might be a challenge with leds in the winter? or not.

Good luck

heres a cheat sheet bro.

veg 1100-1200 ppm nutes 1650 co2, 30 celcius, 60%rh

bud:
week 1: 1200 nutes, 28-30 celsius, 60% rh
week 2: 1250 nutes, 28 celsius, 60% rh
week 3: 1275 nutes, 27 celsius, 60% rh
week 4: 1300 nutes, 26 celsius, 50% rh
week 5: 1400 nutes, 25 celsius, 50% rh
week 6: 1500 nutes, 24 celsius, 40% rh
week 7: 1600 nutes, 23 celsius, 40% rh
week 8: 1650 nutes, 22 celsius, 40% rh
week 9: FLUSH, 20-21 celsius, 40% rh

Flush your medium once every 1 - 2 weeks. and flush right away if you see your leafs not looking happy.

ph 6.4-6.6 going in has always worked well for me with an average runoff around 6.

Choose a small enough pot size that you can soak it right through so fertilizer is coming out the bottom, and have the plant still dry up in 2-3 days. This way you can check run off very easily, i see so many people growing in massive containers and they look at me weird when i ask them how they flush/check runoff. i currently use a 2 gallon fabric pot with 3-4 weeks veg and they are bone dry at 3 days but i usually water every 2 days. dont go longer then this or youll get ppm and ph fluctuation in your soil and start having issues. I use pure coco. nothing added.

This is an aggressive recipe, back it off by 100ppm if you arent comfortable with burning your plants a bit here and there... if you do burn em just give them pure ph'ed water on the next feed.

hope thats not too confusing, lemme know if you need any clarification.

oh, 1 more thing, along with cold ambient temperatures at the end, use freezing cold water in the last few weeks as this will help resin production and cause mild stress to the plant. perfect for finishing up.

pirg420 said:

oh, 1 more thing, along with cold ambient temperatures at the end, use freezing cold water in the last few weeks as this will help resin production and cause mild stress to the plant. perfect for finishing up.

Click to expand...

Yes I never hear other people doing this but I can't lower my room temps at night so I just throw a ton of ice in my res for the last couple waterings it brings out alot of color