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电热温床的功率选定大了增加电器设备成本,并且电器频繁通断缩短了仪器寿命,小了升不到设定温度,因此选定合适的功率是搞好电热温床育苗的重要技术环节。电热温床的功率选定值各地提出了一些指标,全国高等农业院校试用教材《蔬菜栽培学总论》提出100-140瓦/m~2,上海市农机所实验厂提出90-120瓦/m~2,北京蔬菜所提出50-70瓦/m~2,南京蔬菜所提出100-120瓦/m~2……,也有人从热学角度进行计算,从所见到的报导差异较大,50—140
Electric hotbed of large power to increase the cost of electrical equipment, and electrical frequently cut shortened the life of the instrument, the small rise less than the set temperature, so the selection of the appropriate power is an important hotbeds breeding nursery an important part of technology. Electric hotbed power selected values put forward a number of indicators throughout the country, higher agricultural colleges and universities teaching materials “vegetable cultivation theory” proposed 100-140 W / m ~ 2, Shanghai Agricultural Machinery Factory proposed 90-120 watts / m ~ 2, 50-70 W / m ~ 2 proposed by Beijing vegetable and 100-120 W / m ~ 2 proposed by Nanjing vegetable. Some people also calculate from the thermal point of view. -140