Plants need CO₂ for healthy development. CO₂ concentration in greenhouses can vary significantly during the day. In greenhouses that are not ventilated, CO₂ concentration can fall below optimum levels at certain times of the day. In these cases, CO₂ fertilization is necessary for healthy plant development.
The amount of CO₂ in the air is usually around 350 ppm and is sufficient for plants to photosynthesize. However, the amount of CO₂ that plants need to increase production and efficiency is around 1000 ppm. Therefore, it is important to provide CO₂ to plants when CO₂ levels are low.
CO₂ supplied from fuel boilers or liquefied tanks must be accompanied by certain measurements and controls when used in greenhouses. This ensures that CO₂ levels are kept at optimum levels and that plants grow healthily.