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施用CO_2的必要性日本各地9月播种的抑制越冬栽培黄瓜,9月以后播种的促成栽培黄瓜,施用CO_2后均明显增产。在密闭时间长的抑制越冬栽培中,室内CO_2浓度夜间达800ppm左右。上午8时后,黄瓜光合作用渐趋旺盛,CO_2浓度急速下降.晴天日间约在10 时半,阴天在12点前后达最低点,比室外大气CO_2浓度低50～100ppm。雨天几乎不能进行光合作用,因而CO_2浓度到晌午几平没有变化. 施用CO_2的效果在各种栽培方式中,以密闭时间最长的抑制越冬栽培效果最好,整个栽培期间都表现增产,中后期更显著。而密闭时间长的半促成栽培黄瓜,收获初期施用CO_2效果显著,后半期的增产效果不大。施用CO_2的植株,最初叶色有些发黄,但对以后的生育并无影响。由于施用CO_2,落花落果现象大大减少,果实肥大,侧枝发生良好。落花和长侧
Necessity of CO 2 application Seeding in September in various parts of Japan suppressed overwintering cultivation of cucumber, and cultivation of cucumber after sowing in September increased significantly after application of CO 2. In airtight cultivation of overwintering cultivation, indoor CO 2 concentration of about 800ppm at night. After 8:00 am, the photosynthesis of cucumber is getting stronger and the concentration of CO_2 is rapidly decreasing.The sunny day reaches about 10:30, and the cloudy reaches the lowest point before and after 12:00, which is 50 ~ 100ppm lower than the outdoor atmospheric CO_2 concentration. Almost no photosynthesis took place in rainy days, and CO 2 concentration did not change from noon to noon. The effect of CO 2 application In all kinds of cultivation methods, the effect of overwintering cultivation with the longest confinement time was the best, yielding increased throughout the cultivation period, More significant. The semi-cucumber cultivated cucumbers for a long time, the effect of applying CO 2 in the early harvest was significant, and the yield increase in the second half was not significant. Plants that used CO2 were yellow at some initial leaf color but had no effect on later births. Due to the application of CO_2, the phenomenon of falling flowers and fruits greatly reduced, fruit hypertrophy, collateral well. Falling flowers and long sides