So i'm getting mixed opinions from my friends on this. Do I have so exhaust Co2 at night because plants respirate co2 at night?
I mean i know they do but one friend who runs sealed rooms in washington tells me no. Other friend who grows cbd tells me yes i have to.
What are your opinions on this?
Plant respiration happens all the time, which occurs at the roots. Plants and microbes take in o2 and release co2.
Transpiration only occurs during photosynthesis (small amount during the calvin only) where the plants leaves take in co2 and release o2.
So during the calvin cycle the olants continue to produce co2 but stop consuming it so the levels rise. This is not at all an issue. Levels in my room can exceed 2500ppm depending on plant load overnight. There is almost no gas exchange anyhow.
When the light go on in the morning they will quickly eat up that extra co2.
Now here is something most dont know or understand.
Plants produce about 10x the amount of o2 as co2 they consume. So o2 levels can rise dramatically but we don’t measure that.
How does this effect plants? Is it the co2 or the o2 that results in the difference we see?
Well would you be surprised to know that high levels of o2 can inhibit co2 uptake… thats right. So imo i feel we need to vent the excess o2 and not the co2.
So imo best practice (not a must but going for ideals) would be to cent at the end of lights on and allow co2 to build up over the calvin cycle to be consumed once photosynthesis starts.
This is only my opinion