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二氧化碳是光合作用的必要原料，农作物生长所需二氧化碳的浓度为１０００×１０－６～２０００×１０－６，当浓度低于５０×１０－６，作物便停止生产因“饥饿”而死亡。空气中的二氧化碳浓度只有３００×１０－６，在保护地密闭条件下浓度更低，远远不能满足作物生长的需要
Carbon dioxide is a necessary raw material for photosynthesis. The concentration of carbon dioxide required for crop growth is 1000 × 10-6 ~ 2000 × 10-6. When the concentration is lower than 50 × 10-6, the crop will stop producing “hungry” and die. The concentration of carbon dioxide in the air is only 300 × 10-6, which is lower in confined protected areas and far from meeting the needs of crop growth