一、施用二氧化碳气肥的时间日出后0.5～1小时可以开始施用二氧化碳气肥。就一天而言,下午覆盖草苫后,棚室内的二氧化碳浓度开始急剧上升,最高时可达0.1%,到第二天早晨日出后降至自然标准浓度,然后随着光合作用增强而逐渐降低。由于上午的同化量占全天的60%～70%,因此,为节约气肥用量,在上午施放2～3小时即可。严寒季节通风量小,二氧化碳的施用时 First, the time of application of carbon dioxide gas fertilizer Sunrise 0.5 ~ 1 hour after the start of the application of carbon dioxide gas fertilizer. On a daily basis, after covering the weeds in the afternoon, the concentration of carbon dioxide in the greenhouse began to rise sharply up to 0.1% and dropped to its natural standard concentration after sunrise the next morning and then gradually decreased as the photosynthesis increased . As the assimilation of the morning accounted for 60% to 70% of the day, therefore, in order to save the amount of gas and fertilizer, cast in the morning 2 to 3 hours. Low season ventilation, carbon dioxide application