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根据实际观测二月上、中旬塑料大棚内平均气温为0～1℃,下旬6℃左右;三月份棚内夜间温度经常在10℃以下,如遇寒潮降温三月下旬仍可出现0℃左右的低温(今年三月二十五日棚内最低温度为-1℃)。因此不论从安全生产、增加使用时间或满足蔬菜作物的生长发育需要等方面出发都应加强塑料大棚的保温、增温措施。我们从1975年在华北农大等单位指导下开始摸索塑料大棚利用热风炉的加温方法。经过三年试验,初步肯定热风炉比改良温室的炉火具有结构简单、使用方便(可以长期使用也可临时加温)、节约燃料等特点。现将初步试验结果
According to the actual observation in February, the average plastic greenhouse in mid-temperature is 0 ~ 1 ℃, late 6 ℃; March night shed temperature often below 10 ℃, in case of cold wave in late March may still appear around 0 ℃ Low temperature (the lowest temperature in the shed on March 25 this year is -1 ℃). Therefore, no matter from the safety in production, increase the use of time or meet the growth and development needs of vegetable crops and other aspects should be strengthened plastic greenhouse insulation, warming measures. We started in 1975 in North China under the guidance of farmers and other units began to explore the plastic greenhouses using hot stove heating method. After three years of experiments, initially confirmed hot stove better than the improved greenhouse fire has the advantages of simple structure, easy to use (can be long-term use can also be temporary heating), fuel saving and so on. Now the preliminary test results