Supplemental C02 duration for autoflowers

Gladio · Mar 30, 2022

Hi all,

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.

Thanks for your answers

Moe.Red · Mar 30, 2022

Gladio said:
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?

Short answer, yes.

If the room is sealed and the lights are on, if you are not supplementing CO2 you are stalling your plants.

O2 is a non-issue except for root zone, and your plants will make plenty from the CO2. You do not need to bring in fresh air.

Gladio · Mar 30, 2022

Moe.Red said:
Short answer, yes.

If the room is sealed and the lights are on, if you are not supplementing CO2 you are stalling your plants.

O2 is a non-issue except for root zone, and your plants will make plenty from the CO2. You do not need to bring in fresh air.

The answer I needed on spot!

Thanks for sharing your knowledge and experience!

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

Moe.Red · Mar 30, 2022

Gladio said:
and O2 intake on for 4 hours

What do you mean by this?

Gladio · Mar 30, 2022

Moe.Red said:
What do you mean by this?

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.

Am I wrong?

Gladio · Mar 30, 2022

Moe.Red said:
What do you mean by this?

Sorry about my English I make things sound complicated sometimes

Moe.Red · Mar 30, 2022

There is no need to supplement O2 of any kind. Keep the room sealed the whole time.

Gladio · Mar 30, 2022

Moe.Red said:
There is no need to supplement O2 of any kind. Keep the room sealed the whole time.

Thanks for sharing your knowledge

Moe.Red · Mar 30, 2022

No problem.

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!

Ponky · Mar 30, 2022

Have the CO2 turn on with the light timer.

steamroller · May 8, 2022

Ponky said:
Have the CO2 turn on with the light timer.

This is how I use my Co2.

Supplemental C02 duration for autoflowers

Supplemental C02 duration for autoflowers

Gladio

Moe.Red

Gladio

Moe.Red

Gladio

Gladio

Moe.Red

Gladio

Moe.Red

Ponky

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