How can winter sheds regulate lighting
Recently, reporters interviewed the greenhouse vegetable production base in Wuquan Town, Yangling District, Yangling District, Shaanxi Province. Kang Linjie, head of Yangling District Plant Protection Station, explained that light is an indispensable energy source for nutrients and life activities in greenhouse vegetable production, and it is also a greenhouse microclimate. The main factor. Rational regulation of greenhouse lighting is the basis for guaranteeing that the vegetables can perform normal photosynthesis, and it is also a prerequisite for increasing the yield of vegetables. The reasonable setting of the warm winter greenhouse Determine the location of a reasonable greenhouse, improve the lighting and insulation performance of a single slope shed and the orientation of Yangshuo. It is better to sit south 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. The quality of the light-transmitting cover used for high-quality greenhouse membrane protection facilities directly affects the light intensity and light quality transmitted through, so 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 the small loss of reflectance, good insulation, anti-aging, easy to make up, than the temperature drop film 2 °C - 4 °C, so it is now vigorously promote the application. Various measures have been taken to increase the illumination in the shed to whiten the north wall or gable inside the winter warming shed, which can increase the reflectivity; the white film is covered on the floor of the shed at the time of colonization; the reflective film on the three walls can increase the lower part of the plant and The light intensity at the back of the greenhouse increases indoor temperature and ground temperature, increases the photosynthetic capacity of plants, and increases 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. Control lighting through operation management Shading When the greenhouse temperature exceeds the optimum temperature for the growth of vegetables, and when the air is still not cooled, shading techniques can be used to prevent the light and high temperature from damaging the coke and high temperature of the cabbage leaves and improve the indoor working environment. 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. The light quality control adopts a cover that can control the light quality, such as a color film, and adjusts the proportion of light in the wavelength region of the light to control crop growth. The crop is subjected to special light to stimulate the internal organization of the crop to accelerate the growth speed of the crop. Control the environment to avoid the occurrence of weeds and diseases and pests, so as to increase production and efficiency. Fabric: 40 single-sided fabrics of 190 grams of CVC stretch frame, 50% COTTON + 45% POLYESTER + 5% LYCRA composition. The fabric of this T-shirt is breathable and comfortable, and it has a soft feel. The ribbed collar is more durable and stylish. Cvc T-Shirt,Outdoor C T-Shirt,Mens T Shirts,Outdoor T Shirts Xinhui Jielide Garment Factory , https://www.ntgfwear.com
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