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农作物总干重的90—95%来自光合作用,二氧化碳是作物进行光合作用的主要原料之一。空气中的二氧化碳浓度通常只有万分之三左右,不能满足作物的需要。因此,象施肥那样,提高作物周围环境中二氧化碳的浓度,是提高光合作用效率、增加作物产量的一个重要途径。塑料薄膜覆盖栽培,是北方地区延长作物生长季节、提高蔬菜产量的重要措施。在塑料大棚中,由于通风不如露地,往往容易造成二氧化碳亏缺,致使降
90-95% of the total crop dry weight comes from photosynthesis, one of the main raw materials for crop photosynthesis. The concentration of carbon dioxide in the air is usually only about three ten thousandths, can not meet the needs of crops. Therefore, as fertilization, increasing the concentration of carbon dioxide in the environment around crops is an important way to increase photosynthesis efficiency and increase crop yields. Covering plastic film cultivation is the northern region to extend the crop growth season, an important measure to increase vegetable production. In the plastic greenhouse, due to ventilation than exposed, often easily lead to carbon dioxide deficiency, resulting in decreased