Illumination is an indispensable energy condition for the production of nutrients and life activities in greenhouse vegetables, and is also a major factor in the formation of microclimate in greenhouses. The reasonable regulation of lighting in greenhouses is the basis for guaranteeing that vegetables can perform normal photosynthesis, and it is also a prerequisite for ensuring high yields of vegetables. First, the reasonable setting of the winter warm greenhouse 1. Determine the position of a reasonable greenhouse to improve lighting and insulation performance. The location of the single-slope shed and Yangshuo is better to sit north and south, so that the maximum amount of sunlight can be received in winter. While the arch sheds are mainly delayed production in early spring and autumn, it is advisable to extend them from north to south. Every effort should be made to increase the slope of the lighting surface, because the larger the angle, the greater the amount of solar radiation in winter and the better the lighting conditions in the facility. In the shed, a cantilever beam suspension structure should be adopted to reduce the shading area in the facility and improve lighting conditions. 2. Use high-quality greenhouse film. The quality of the light-transmitting cover of the protective facility directly affects the light intensity and the quality of the transmitted light, so a high-quality film must be used. At present, the most widely used greenhouse is PVC film. The advantage of this kind of film is good heat insulation, but PVC film is easy to adhere dust and reduce the light transmittance; while polyvinyl chloride has no drop and longevity film transmittance of visible light 88%, ultraviolet light The rate of 20%, infrared light rate of 72%, and the loss of reflectance is small, good insulation, anti-aging, easy to make up, than the temperature of the film is 2 °C ~ 4 °C higher, so it is now strongly promoted and applied. 3. Take various measures to increase lighting in the shed. Applying white to the inside of the north wall or gable of the winter warming greenhouse can increase the reflectivity; the white film is covered on the floor of the greenhouse when the plants are planted; the reflective film on the three walls can increase the light intensity of the lower part of the plant and the rear of the greenhouse to make indoor Temperature and ground temperature increase, improve the plant's photosynthetic capacity, increase production. It should be noted that the reflective film should be flat and the hanging time should be after 10am and before 3pm so that the lighting in the shed can be fully utilized. Second, control lighting through operation management 1. Shading: When the greenhouse temperature exceeds the optimum temperature for the growth of vegetables, and the air supply can not be cooled, in order to prevent light, high temperature on the vegetable coke and high temperature barriers to improve the indoor operating environment, shading technology can be used. Sunshade nets and insect nets are relatively new types of cover materials, and both are playing an increasingly important role in the cultivation of facilities for vegetables. Measurement results showed that the sunshade net has a strong light-shielding ability, and the light intensity in the shading net shelter is 43.8% of the exposed ground, and the shading rate of the anti-insect net is 24.7%. Silver shade net can be used. For example, in the summer, the use of shade nets to cover cultivated tomatoes can reduce the light intensity and temperature, keep the soil moist, and facilitate the emergence of seedlings. 2. Light quality control: the use of light-weight coverings such as color film, adjusting the proportion of light in the wavelength region of light to control crop growth, special light crops, stimulate the internal organization of the crop, in order to speed up the growth of the crop , Regulation, control of the environment, to avoid the occurrence of weeds and diseases and insect pests, so as to achieve increased production efficiency. 5kw High Frequency Welding Machine 5Kw High Frequency Welding Machine,High Frequency Welder For Plastic Package,High Frequency Pvc Welding Machine,High Frequency Welding Machine For Tarpaulin Wuxi DIZO Ultrasonic Technology Company , https://www.dizosonic.com