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北方普遍采用日光节能温室于冬季及早春进行蔬菜生产,以增加淡季蔬菜供应。但由于外界温度低、光照时数短,加上扣膜后透光率降低,对蔬菜生产仍需改进。措施是增加温室采光量,提高温度和促进植株光合作用。 一、提高温室屋面角度。根据纬度及光周期变
The northern part of daylight conservatory is commonly used for vegetable production in winter and early spring to increase the supply of off-season vegetables. However, due to the outside temperature is low, the number of hours of light, coupled with the deduction after the light transmittance decreased, the production of vegetables still need to be improved. Measures are to increase the amount of greenhouse lighting, increase the temperature and promote plant photosynthesis. First, improve the greenhouse roof angle. According to latitude and photoperiod change