For indoor gardening co2 is recommended because the plants under the lights will have scrubbed the room clean of atmospheric co2 in a few hours. The Co2 needs to be replenished or nothing will grow so there needs to be some sort of gas exchange or growth stalls out.
But also it is recommended because it can boost yeilds dramatically. Co2 is the most over looked plant nutrient.
Plants are able to process far more co2 then is in the atmosphere. The highest readings of atmospheric Co2 are about 400ppm, (I've also heard from 330-360ppm) but the recommended amount that you should give your plants is close to 1500 ppm.
For indoor gardening co2 is recommended because the plants under the lights will have scrubbed the room clean of atmospheric co2 in a few hours. The Co2 needs to be replenished or nothing will grow so there needs to be some sort of gas exchange or growth stalls out.
But also it is recommended because it can boost yeilds dramatically. Co2 is the most over looked plant nutrient.
Plants are able to process far more co2 then is in the atmosphere. The highest readings of atmospheric Co2 are about 400ppm, (I've also heard from 330-360ppm) but the recommended amount that you should give your plants is close to 1500 ppm.