First, the reasonable setting of the winter warm greenhouse to determine a reasonable position of greenhouses, improve lighting 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.
Second, the quality of the light-transmitting cover used in high-quality greenhouse membrane protection facilities directly affects the light intensity and light quality that pass through. Therefore, a high-quality shed 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 a small loss of reflectance, good insulation, anti-aging, easy to make up, than the dripping film temperature is 2-4 °C, so it is now vigorously promote the application.
Third, take various measures to increase the light in the shed. Applying white to the inside of the northern wall or gable of the winter warming greenhouse can increase the reflectivity; cover the white film on the floor of the greenhouse when planting; and put reflective film on the three walls to increase the number of plants. The light intensity of the lower part and the rear part of the greenhouse will increase the indoor air temperature and the ground temperature, increase the photosynthetic capacity of the plants, and increase the yield. 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.
Fourth, shading When the greenhouse temperature exceeds the temperature of vegetable growth and temperature, while the air is still not cooling, in order to prevent strong light, high temperature on the coke and high temperature barriers, improve the indoor operating environment, you can use shading technology. 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.
Fifth, the light quality control uses a cover that can control the light quality, such as a color film, to adjust the proportion of light in the wavelength region of the light to control the growth of the crop. The crop is subjected to special light to stimulate the internal organization of the crop to accelerate the growth speed of the crop. Regulate and control the environment to avoid the occurrence of weeds and diseases and insect pests, so as to increase production and efficiency.
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