Still new to CO2.... but learning.

DoubleAtotheRON

DoubleAtotheRON

Well-Known Member
Im in mid week 5 of flower. CO2 is burning at ~1400ppm. At lights on, the CO2 has dropped to ~600, and the temps are at upper 60's, RH bottoms out at ~45. The pattern has been what I just said about lights on, but as the 12 hour day goes on, I will see the RH rise to 60ish, and the temps will hit ~91 towards the end of the light cycle. This has been the cycle for about 2 weeks now. I noticed that as they gained more biomass, the RH has gone up and my dehuyes are working overtime to keep it down, in turn raising the temps. I have been on the lookout for cupping, curling, burning, etc, but have seen none of that. Matter of fact, this is prob the best looking crop i've done so far... making sugar like crazy. The temps worry me a bit tho. I will be able to dim the lights down in the next week or so to mimic fall, and lower the temps, but is ~91 ok when running CO2 at those levels? They seem to be loving it. Any experts on CO2?
EDIT: I've also noticed that I can feed in at ~1400ppm with no burn, and that the CO2 generator tends to come on more as the temps go up during the end of the cycle.

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Renfro

Renfro

Well-Known Member
Looking good brother! Glad you are liking the new gear. CO2 and the AirROS. You have a setup to be very proud of there. Nice and clean too. Keep up the good work. Hopefully next crop tests clean for ya.
 
Renfro

Renfro

Well-Known Member
With LED lighting and the lack of IR light you shouldn't be too bad with the temps. I would reduce CO2 PPM and temps during ripening.
 
Renfro

Renfro

Well-Known Member
Typically when running CO2 enrichment we need to increase temperature and lighting and feed. When you nail that balance your plant is on overdrive. If you increase just some of those things then the ones you didn't increase will be holding you back. Typically with a CO2 enriched room with LED lighting (no IR) I would want to have temperatures in the mid 80's, like up to 87 maybe even 88. Considering you're only ramping a few degrees above and only for the last part of the day I see no big problem there so long as you are able to drop things off during ripening which you already said you can do.

Just to let you know what I have done in the past, I used to have canopy temps in the upper 80's, even at 90 when I grew back in Missouri. That was under HPS with CO2 enrichment. It wasn't ideal but I still achieved excellent yields and product. I wasn't even able to drop temperatures because I had a perpetual in the room. That was actually at multiple grow houses too. I was able to run higher RH% numbers though, I never ever saw powdery mildew or botrytis on the strain I grew then as it was very resistant. That said you can't monocrop one strain for 7 years in the market you are working with lol, need a little variety. I have learned a lot with the freedoms of having a legal grow, one thing is that strain matters a LOT. Some strains can tolerate something that others can't, weather thats excessive RH%, high temps, light intensity, feed strength.
 
DoubleAtotheRON

DoubleAtotheRON

Well-Known Member
Renfro said:
Typically when running CO2 enrichment we need to increase temperature and lighting and feed. When you nail that balance your plant is on overdrive. If you increase just some of those things then the ones you didn't increase will be holding you back. Typically with a CO2 enriched room with LED lighting (no IR) I would want to have temperatures in the mid 80's, like up to 87 maybe even 88. Considering you're only ramping a few degrees above and only for the last part of the day I see no big problem there so long as you are able to drop things off during ripening which you already said you can do.

Just to let you know what I have done in the past, I used to have canopy temps in the upper 80's, even at 90 when I grew back in Missouri. That was under HPS with CO2 enrichment. It wasn't ideal but I still achieved excellent yields and product. I wasn't even able to drop temperatures because I had a perpetual in the room. That was actually at multiple grow houses too. I was able to run higher RH% numbers though, I never ever saw powdery mildew or botrytis on the strain I grew then as it was very resistant. That said you can't monocrop one strain for 7 years in the market you are working with lol, need a little variety. I have learned a lot with the freedoms of having a legal grow, one thing is that strain matters a LOT. Some strains can tolerate something that others can't, weather thats excessive RH%, high temps, light intensity, feed strength.
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You've never led me astray bro!....appreciate all your wisdom!
 
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F80M4

Well-Known Member
I wouldn't dim the lights. 1300-1400 range for co2 is good I use it in veg too. At first co2 during veg seems like it's not working for a week and bam they grow like monsters quick. I feed super aggressive too but this is very double edged as you need to make sure you run water atleast twice a week. I some how missed 12 plants and they went golden literally. Now I'm running 3 LEDs on one side of the room and I wish I done this sooner. On your last week drop your co2 to about 1000 and feed water with mollases. You'll thank me when you weigh
 
DoubleAtotheRON

DoubleAtotheRON

Well-Known Member
F80M4 said:
I wouldn't dim the lights. 1300-1400 range for co2 is good I use it in veg too. At first co2 during veg seems like it's not working for a week and bam they grow like monsters quick. I feed super aggressive too but this is very double edged as you need to make sure you run water atleast twice a week. I some how missed 12 plants and they went golden literally. Now I'm running 3 LEDs on one side of the room and I wish I done this sooner. On your last week drop your co2 to about 1000 and feed water with mollases. You'll thank me when you weigh
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Only problem I have will not dimming the lights, is that’s the only way I can drop the temps... or kill the dehuyes. Or both. With everything runnning, I’ll be at ~90-91 on the last 2-3 hours of the cycle. I don’t want to cook my terps tho. I’ll be adding another 3 ton mini split after this run to keep it under better control.
 
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F80M4

Well-Known Member
DoubleAtotheRON said:
Only problem I have will not dimming the lights, is that’s the only way I can drop the temps... or kill the dehuyes. Or both. With everything runnning, I’ll be at ~90-91 on the last 2-3 hours of the cycle. I don’t want to cook my terps tho. I’ll be adding another 3 ton mini split after this run to keep it under better control.
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how many lights you have again bro
 
greg nr

greg nr

Well-Known Member
That is one fine looking patch of herb. I just started using co2 last year, but what renfro said was basically the advice I was given when I started and it was spot on. Temps high 80's, let the humidity climb to keep it in the "zone", and up your light output.

Then stand back. I've never had such heavy buds.....
 
DoubleAtotheRON

DoubleAtotheRON

Well-Known Member
firsttimeARE said:
Awesome looking grow. Real clean too.

Im on the fence with CO2 currently. I feel its the only thing I can do to increase efficiency/yields
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Thanks! We appreciate it!... don’t be on the fence with CO2. This was prob one of our best investments as far as yield goes. Plus, we can run higher temps too. I don’t know your setup, but a generator is def the way to go. No bottles to fill, lug around , etc. We have a 500 gallon tank that we tapped into from our residence, and hard piped to the grow house. We only have to have it filled once a year.
 
DoubleAtotheRON

DoubleAtotheRON

Well-Known Member
greg nr said:
That is one fine looking patch of herb. I just started using co2 last year, but what renfro said was basically the advice I was given when I started and it was spot on. Temps high 80's, let the humidity climb to keep it in the "zone", and up your light output.

Then stand back. I've never had such heavy buds.....
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Awesome!, I’m about to go snap some pics and do my end of week 5 update in the grow link below.
 
firsttimeARE

firsttimeARE

Well-Known Member
DoubleAtotheRON said:
Thanks! We appreciate it!... don’t be on the fence with CO2. This was prob one of our best investments as far as yield goes. Plus, we can run higher temps too. I don’t know your setup, but a generator is def the way to go. No bottles to fill, lug around , etc. We have a 500 gallon tank that we tapped into from our residence, and hard piped to the grow house. We only have to have it filled once a year.
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Just not sure how beneficial it is with lower temps. I like to keep my room around 80F so my chiller doesnt have to work so hard. I run a RDWC setup so if ambient temp goes too high the water temp gets too high. The chiller is in the room too. Also it has a window AC unit and not sure how windows and in particular Window AC units work for a sealed room. Imagine be hard to keep sealed
 
DoubleAtotheRON

DoubleAtotheRON

Well-Known Member
firsttimeARE said:
Just not sure how beneficial it is with lower temps. I like to keep my room around 80F so my chiller doesnt have to work so hard. I run a RDWC setup so if ambient temp goes too high the water temp gets too high. The chiller is in the room too. Also it has a window AC unit and not sure how windows and in particular Window AC units work for a sealed room. Imagine be hard to keep sealed
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Prob true... window ac units are terrible for leaking.
 
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F80M4

Well-Known Member
24c range they suck up that co2 slow around 26-28c they sucked up half a bottle of co2 in a day. I would run a burner but I don't want to deal with the heat or some type of fire. I rather run the tanks. Also when you use co2 you need to feed more aggressive. I ran one of lights in a tent with no co2 with my aggressive feed and the plants in the tent they did not like it at all. I thought it was just a coincidence so I did it again. They didn't last a week.
 
DoubleAtotheRON

DoubleAtotheRON

Well-Known Member
F80M4 said:
24c range they suck up that co2 slow around 26-28c they sucked up half a bottle of co2 in a day. I would run a burner but I don't want to deal with the heat or some type of fire. I rather run the tanks. Also when you use co2 you need to feed more aggressive. I ran one of lights in a tent with no co2 with my aggressive feed and the plants in the tent they did not like it at all. I thought it was just a coincidence so I did it again. They didn't last a week.
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What do you consider aggressive feed?
 
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