Sealed room plants yellowing

[Fear]

Hi guys a friend of mine has a 12k sealed room with Co2 Burner, green air controller, 3 tons of ac keeps it at a steady 75f. Why would the plants yellow, seems like they are suffocating. people are telling her she needs to vent at night. That seems like it defeats the purpose of a sealed room. Can anyone please help. She grows in soil but did fine before sealing the room.

 

[Fire On High]

Probably cause she's treating those plants even better with all the c02 and climate control so they're using more nitrogen. There isn't enough N for them, so they're showing they're colors. (my assumption)

 

[libby]

So, change things let them breathe for now, see if things change shut the stuff your doing, it ain't workin. DON'T LOSE EM.

 

[cannascholar]

What's her co2 ppm? I'm kinda goin through the same problem.

 

[Fear]

I had her set it to 1500 but i think she reduced it to 1200-1300 ppm, which is fine. I had her even upgrade her food, buy a ppm and ph meter for feedings. But the second grow didn't do as well either.
As for letting them breath, what is it you think they breath? It's not oxygen! Adding fresh air exhaust just downgrades the room too 400 300 ppm Co2 instead of 1500. She has a perfectly good sealed room. I just can't figure it out. Hydro store lame asses say you need fresh air at night. to much cabon monoxide. If that's the case I want a second opinion.

 

[akasomeoneelse]

im no expert as ive never had a sealed room.... but i am in the process of reading up on the subject because i plan on switching to sealed. from what ive understood so far,

plants do not need high co2 at night. you can turn off your burner and save on co2 or propane.

burning propane also creates carbon monoxide which does require venting periodically troughout the day period. im not sure of the vent shedule but i know you dont have to vent for long each time..

also a room temp of 85 would be better

what you save by not burning at night will probly still outweight what you loose by having to vent a couple time a day.. sorry if my info is off like stated im no expert.
hope this helped some.. your plants might be using more N like said also, everything is supercharged with the co2 and something the only thing holding a plant back ends up being the caretaker not being dialed in perfectly.. after a couple time with the same strains it becomes easier to determine its needs in advance..

take care

 

[GhettoGospel]

Sounds nutrient related

 

[Fear]

I thought it was nutrient related to, but the feed has been change to advanced nutrients. The Co2 controller has a photo cell control so it never runs at night. I had an 8k sealed room but I used 2 50lbs. tanks, never had this problem. My grow is alot smaller now and I still Use Co2 and I have never had such a problem. As for the temp she did raise it to 85f too.
I don't understand these Co2 burners need an exhaust? What does anyone else do with a sealed room that has a Co2 burner do? I'm trying to narrow down the possibilities. Thanks for all the answers so far. Should the room be venting at night. Seems wrong and even though the air would be scrubbed it still seems to me to be wrong. She has plenty of air circulation too.

 

[Veno.Amana]

once you add in c02, you have to remember, you're going to speed up you plants metabolism and if you're just giving them the same nutrients program as you did before with out c02, then you will run in to problems.

Co2 best run sealed, once lights cycles are off, vent needs to be on to remove any excesses c02 that isnt used during lights cycle.

1500 is ideal, 5000 will kill anything,

Burners are much stronger then bottles, bottle will never be able to reach the ppm levels you plants need especially 12k watts. take that into consideration


Veno.A

 

[Hank Hemp]

Does it look like a N problem to you? Sort of sounds like it.

 

[Fear]

Does it look like a N problem to you? Sort of sounds like it.

At first I thought a PH problem, then thought it was the genetics she got from a club with their so called chem dawg and shitty casey. I believe it is a Nitrogen and a low 1200ppm feeding problem. I always suspected that. She is using sensi a and b. She also turned her o2 generator down to 1000ppm. Told her to raise the Co2 back to 1500 and to up the feedings to 1400-1500 ppm also and then foliar spray some sort of N. I just want to make sure I don't need an exhaust. This room should be optimal. 50% humidity, sealed and 12 vented XXXL hoods, digital ballasts, sealed Co2 inriched room (totl Propane burner), 3 dehumidifiers, multiple oscilatting fans, 1 ton ac and 2 ton ac split units, green air Co2 controller with photo cell, Sensi A & B grown in soil. Let me know if I'm missing something, I don't think I could of designed a much better room.

 

[cannascholar]

Pics would be helpful. I'd lower the co2 for now and never let it rise above 1200ppm. 1500 seems to be too high according to several sources. Whatever problem she's having, it is being escalated by the co2 increasing the plant's metabolism. She doesn't have any ngw hose in there does she?

 

[Fear]

ngw hose? What is that like pvc hose. 1200 ppm ok sounds good. I asked for her to email me some pics too.

 

[kolkatt]

good luck

 

[Space Ghost]

could be something as simple as an N or Mg shortage....

 

[RomulusUSA]

ngw hose? What is that like pvc hose.

Yep, vinyl hose I believe. Its known for offgassing. I talked to my grow shop guys and they said the older stuff only, the new rolls have no issues, and no lettering on hose.

 

[Phillthy]

i doubt it has anything to do with the sealed room.

 

[green_thumb...]

It's to my understanding that when using Co2 plants usually like higher temps like 80+ and not only stronger nutes but the proper larger amounts of the nutes they are now using more of due to more Co2 and higher room temps.

That's why I always read that when using Co2 all the other elements must be aces to benefit the use of.

And I would think a fresh air Exchange mid lights off every few days or so would help prevent any potential problems regarding the usage of Co2 yeah?

 

[Tela]

i just had my 2 shittiest harvests in years trying a "sealed room" for the first time. similar setup. i'm trying the venting @ night, more food approach like the others suggested. seems to be getting better. i also thought i had a pH problem. im about to give up on the sealed rooms. always used to get 2+ without them. now its like 1.5 per. shits lame

 

[Fear]

Sounds exactly like my friends grow. Last two were shitty. She has a plan I need to cxall her today and see what she says. I will keep you guys posted.