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青海地处高寒,无霜期短,昼夜温差悬殊。气候条件较好的西宁地区,细菜作物一般于一月中下旬开始在温室里育苗,经过4个月漫长的育苗期,到5月中下旬,霜冻过去之后,才能定植露地,(塑料棚定植早些,在4月上中旬)。为此要付出大量的人力和时间,并消耗大量的燃料,这就提高了成本费用。在寒冷的冬季。温室中靠生火炉是很难提高地温的,每提高1℃的地温,约相当于提高3℃气温所消耗的燃料。但在气温和地温都比较低的情况下,提高地温对植物更为有利。尤其是育苗阶段。为了达到出苗整齐,
Qinghai is located in alpine, frost-free period is short, the temperature difference between day and night disproportionate. In Xining, where the climatic conditions are better, the fine-grained crops generally begin to nurture seedlings in the greenhouse in the middle of the second month of January. After 4 months of long seedling raising period, the frost can not be planted until mid-to-late of May. (Plastic shed planting Earlier, mid-April). To do this requires a lot of manpower and time, and consume a lot of fuel, which increases the cost. In the cold winter. It is very difficult to raise the ground temperature by the furnace in the greenhouse. Each time the ground temperature increases by 1 ℃, it is equivalent to the fuel consumed by increasing the temperature by 3 ℃. However, in the case of low temperature and ground temperature, raising the ground temperature is more beneficial to plants. Especially nursery stage. In order to achieve the emergence of neat,