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Ｃ３作物对ＣＯ２最敏感．蔬菜属Ｃ３作物．由于日光温室、塑料大棚蔬菜生产环境基本上封闭，ＣＯ２浓度不足，远不能满足作物光合作用需要，使作物处于饥饿状态．在温棚中增施ＣＯ２，可使蔬菜长势旺盛，病害减轻，花期、结果期、采收期提前，产量大幅度提高．实验结果表明：９ｈ３０ｍｉｎ～１０ｈ３０ｍｉｎ为最佳施用时间；定植活棵后１５～２０天、作物花芽分化和果实膨大时施用效果最佳，西红柿、黄瓜和西葫芦、芹菜，ＣＯ２浓度分别为１２００ｐｐｍ、１２００～１３００ｐｐｍ、１３００～１５００ｐｐｍ时，产量最高．
C3 crops are the most sensitive to CO2. Vegetables are C3 crops. As the greenhouse, plastic greenhouse vegetable production environment is basically closed, lack of CO2 concentration, far can not meet the needs of crop photosynthesis, the crops in starvation. Adding CO2 in the greenhouse can make the vegetables grow vigorously, alleviate the diseases, and the flowering period, the fruiting period and the harvesting period are advanced, and the yield is greatly increased. The results showed that: 9h30min ~ 10h30min was the best application time; 15 ~ 20 days after planting live trees, the best effect was obtained when flower bud differentiation and fruit enlargement. The concentrations of tomato, cucumber, zucchini and celery were 1200ppm, 1300ppm, 1300 ~ 1500ppm, the highest yield.