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在自然环境下,空气中的二氧化碳(CO_2)浓度呈现动态变化曲线,清晨最高时达400×10~(-6)(400 ppm),中午最低时仍达250×10~(-6),可满足各种作物生长发育对CO_2的需求。低温季节保护地长期处于相对密闭、空气流动缓慢的环境条件下,CO_2浓度变化幅度远远大于自然环境。如清晨时,CO_2高达1 200×10(-6);上午10时至下午4时,CO_2却降到100×10~(-6)以下;正当蔬菜生长最旺盛阶段,CO_2只达需求量的30%左右,导致光合作用严重受阻,造成蔬菜产量及商品价值下降。一、施用CO_2气肥的增产效果在日光温室、塑料大棚等栽培条件下,多种蔬菜及果树、花卉苗木,均适宜施用CO_2气肥。作为一项增产措施,它能满足蔬菜在光合作用过程
Under natural conditions, the concentration of carbon dioxide (CO2) in the air shows a dynamic curve, reaching 400 × 10 -6 (400 ppm) in the morning and reaching 250 × 10 -6 at the lowest at noon Meet a variety of crop growth and development of CO_2 demand. In the low temperature season, the protected area is relatively confined for a long time. Under the condition of slow air flow, the change range of CO 2 concentration is far greater than the natural environment. For example, in the early morning, CO 2 was as high as 1 200 × 10 (-6); while CO 2 decreased below 100 × 10 -6 in the morning from 10 a.m. to 4:00 a.m. About 30%, resulting in serious obstruction of photosynthesis, resulting in decreased vegetable output and commodity value. First, the application of CO 2 gas fertilizer yield effect In the greenhouse, plastic shed and other cultivation conditions, a variety of vegetables and fruit trees, flower seedlings, are suitable for the application of CO_2 gas fertilizer. As an increase in production, it can meet the vegetables in the photosynthesis process