Hello everyone,this is going to be a long one and any brave soul willing to answer any or all of the questions below to the best of their ability will receive my greatest gratitude.
This will be my first sealed room grow with any type of environmental control and am just looking for the best input I can get from a scientific standpoint!
I just got my hands on a nice Environment Controller (Blueprint Controllers Digital Atmosphere Controller with Fuzzy Logic, BDAC-2
) The internets grow forums are full of totally contradictory information, and it appears this forum prides itself on the more scientific approach rather than hippy/stoner myth.
A past user here that goes by the name Spurr did a great write up on c02
and how ideally we should be running a sealed room at no more than 1200 ppm. However, he left a few follow up questions unanswered that I was hoping someone could fill me in on.
With that said, I was hoping I could get a general run down from you kind members who have experience in a sealed room with proper environmental settings during flower stage.
Here are my current environmental settings:
DAY TIME FLOWER
- CO2 RANGE: ~1,000-1,200 ppm
- MAX TEMP: 86F
- MIN TEMP: 78F
- MAX RH: 80%
- MIN RH: 70%
Some may see the RH settings and think it is way too high, but I am trying to stay in VPD
ranges according to this chart:
What do you guys think of these settings?
- Is it true that c02 is best to be run with higher day time temps - maximum of around 90F?
- What stages during flower is c02 most beneficial i.e. should I lower it dramatically or keep it around the 1200 level during ripening stage?
- With such high RH how can I best avoid bud rot - is there anything else I can do besides giving proper airflow?
- Is there such thing as too much airflow on the canopy?
I have not begun researching proper night settings yet, but here are my thoughts so far.
NIGHT TIME FLOWER
- CO2 RANGE: 0 - 500 ppm
- MAX TEMP: 78F
- MIN TEMP: 68F
- MAX RH: 70%
- MIN RH: 60%
- I have read if you keep night temps a few degrees below day temps the first few weeks it can help reduce stretch - any truth to this?
- If so, how much lower should I keep temps during night once stretch is over?
- Should I run c02 at all during the night?
- Does VPD really matter during lights out? Should I just instead keep RH around the advised 55% instead?
If anyone has any insight in to lights off settings would be much appreciated.
And finally, Spurr mentioned that c02 use can cause ethylene buildup which can adversely effect yield and growth and that it is advisable to fully vent the room once a day. I was thinking ~30 mins after lights go off - thoughts?
Thanks again and I look forward to learning as much as I can here!