The history and role of greenhouses: greenhouse covering material for plastic film. Suitable for large area coverage, because it is the quality of light, good light insulation properties, plasticity, and low prices. Also, because you can use lightweight frame materials, easy to build and shape the film greenhouses may be taken grid, less investment in construction, high economic efficiency. And resistance to natural disasters, cold insulation, drought, floods, early planting, delayed planting, extend the growing season crops reach puberty, late, increasing and stabilizing purposes, by the producers welcome. Therefore, in the arid areas of northern China has developed rapidly. Features greenhouses: humidity conditions. Due to the large greenhouse air temperature, soil evaporation small vegetable greenhouse film project, so in the winter cold season to reduce the amount of irrigation. However, the price of vegetable greenhouse film, canopy temperature, or the temperature is too high when needed ventilation film vegetable greenhouse construction, would cause the humidity dropped to accelerate crop transpiration, causing water plants transpiration rate of decline, or cause physiological disorders. Therefore, according to the requirements of the crop must be shed, to maintain proper humidity. Film vegetable greenhouses prices, Communications Technology, Yinchuan film vegetable greenhouses provided by Anyang City Communications Technology Limited. Anyang City Communications Technology Co., Ltd. (www.aytlkj.com) is Anyang, a leader in agricultural supplies, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Communications technology leadership in the staff warmly welcome all inquiries negotiations to create a better future for Communications Technology.