二氧化碳是绿色蔬菜作物进行光合作用的主要原料。温室和外界环境隔离,二氧化碳浓度不稳定。为提高作物产量需人工补施二氧化碳,但补施时应注意以下几点:1 施用时间 每天揭苫后0.5小时开始施用,使温室在1～3个小时保持设定的二氧化碳浓度,下午一般不施用。中午随放风量加大一般于10:30～11:20停止 Carbon dioxide is the main raw material for photosynthesis of green vegetable crops. Greenhouse and environmental isolation, carbon dioxide concentration is not stable. In order to increase crop yield, artificial supplement of carbon dioxide is required. However, the following points should be taken when supplementing: a. The application time is 0.5 hour from the day of application and the greenhouse is kept at the set carbon dioxide concentration for 1 to 3 hours. In the afternoon, Application. Noon with the increase in the amount of ventilation generally stop at 10:30 ~ 11:20