The average level of CO2 in the atmosphere is about 300 parts per million (ppm). If the level decreases below 200 ppm in an enclosed growing area, plant growth slows to a halt. Through years of testing and research, the optimum enrichment level of CO2 for plant growth has been agreed to be about 1500 ppm. With carbon dioxide, under good conditions, plant growth rates and flowering will increase 20-100%. CO2 systems can be used from seedling right through harvest.
Carbon dioxide is an odorless, invisible and non-flammable gas. It is also safe for humans in the maximum concentrations recommended for plant growth.
