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二氧化碳是绿色蔬菜进行光合作用的主要原料。蔬菜对二氧化碳的利用与光强度有关,在塑料大棚这一密闭空间内,当白天日出后蔬菜光合作用逐渐加强,二氧化碳浓度逐渐降低,使蔬菜处于二氧化碳的饥饿状态。因此日出后需及时补充二氧化碳,除用通风换气、多施有机肥外,还可以用更有效的化学方法补充二氧化碳。用硫酸和碳铵反应产生二氧化碳是比较成功的方法,生成的硫酸铵还可以做肥料施用。实验表明,大棚内二氧化碳浓度在1000—1500mg/kg 是适宜的,在1
Carbon dioxide is the main raw material for photosynthesis of green vegetables. Vegetable use of carbon dioxide and light intensity, plastic greenhouse in the confined space, when the day after sunrise photosynthesis of vegetables gradually strengthened, the concentration of carbon dioxide gradually reduced, so that vegetables are starved of carbon dioxide. Therefore, after sunrise, it is necessary to replenish carbon dioxide in time. In addition to ventilation and organic fertilizers, carbon dioxide can also be supplemented with more effective chemical methods. Using sulfuric acid and ammonium bicarbonate to produce carbon dioxide is a more successful method, the generated ammonium sulfate can also be used as fertilizer. Experiments show that the greenhouse carbon dioxide concentration of 1000-1500mg / kg is appropriate, at 1