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近几年,不少地区在蔬菜大棚内施用二氧化碳气肥,满足了光合作用需要,亩产量直线上升,经济效益大幅度增加。 一、施放二氧化碳气肥的机理 光合作用所需要的碳源,主要来自空气中的二氧化碳,棚内二氧化碳的含量,直接影响蔬菜的产量。空气中二氧化碳的浓度是相当稳定的,约为300PPm,而且在作物群体内部及其附近,还常常低于这个数值。蔬菜大棚密闭,与外界气体不能随时交换,造成棚内二氧化碳含量大大低于棚外。据测定,棚内睛天日出前二氧化碳浓度在600PPm,日出后植株进行光合作用,到上午九时棚内二氧化碳浓度降
In recent years, many areas of the greenhouse in the use of carbon dioxide gas fertilizer to meet the needs of photosynthesis, mu production rose, the substantial increase in economic efficiency. First, the mechanism of releasing carbon dioxide gas Fertilizer carbon source needed for photosynthesis, mainly from the air of carbon dioxide, greenhouse carbon dioxide content, a direct impact on vegetable production. The concentration of carbon dioxide in the air is fairly constant at about 300 ppm and is often below this value both within and near the crop population. Greenhouse sealed airtight, with the outside world gas can not be exchanged at any time, resulting in shed carbon dioxide content is much lower than the shed outside. It is determined that the shed before the sunrise carbon dioxide concentration of 600PPm, plants after sunrise photosynthesis, to nine o’clock shed CO2 concentration decreased