Currently I have 350 autoflowers in their seedling stage.
In this grow I am planning to use supplemental CO2. I have an Ecothenics evolution controller with a CO2 sensor.
I m considering a closed loop system for the entire grow operation.
However for the first 4 weeks I will have the lights on for 24 hours straight and then 20/4 in the bloom phase.
I know CO2 is useless when plants are not photosyntesising. Since I m gonna run the ligths on for 24 hours, should I also run CO2 for continous 24 hours without any O2 intake?
I am considering increasing CO2 on a systematic bases. I ll start with 800ppm in the veg stage and eventually go up to 1300 to the end of the bloom phase. My light source, temp and humidity will be set accordingly.
I know CO2 is useless when plants are not photosyntesising. Since I m gonna run the ligths on for 24 hours, should I also run CO2 for continous 24 hours without any O2 intake?
So through out the veg stage (4 weeks) I will be running CO2 at all times with no O2 intake. And in bloom stage I will run CO2 for 20 hours on and O2 intake on for 4 hours
Since I will switch to 20/4 on bloom stage for autoflowers. I think its not needed to supplement CO2 for the 4 hour darkness period. In that 4 hour dark period I will have my intake and exhaust on to supplement O2.
I have a few sealed rooms that I grow monsters in under CO2 using RDWC. The only time they get air exchange outside the grow space is when I open them to work on the plants.
FWIW - you already have an oxygen rich environment there thanks to photosynthesis. Opening the door actually LOWERS O2!