Shed the history and function: 1966 Changchun first to a small shed converted into a 2-meter square shed. But poor resistance to snow and collapsed after several alterations trial finally created about two meters tall plastic vegetable greenhouses, 15 meters wide, covering an area of ??1 acre arched greenhouses. 1970 promotion to the rest of the north. 1975, 1976 and 1978 held three "national plastic greenhouse vegetable production research collaboration will be" meeting on the development of greenhouse production played a role. Features greenhouses: humidity conditions. Without ventilation, the shed up to 60-80% relative humidity during the day, at night often plastic vegetable greenhouses in price about 90%, up to 100%. Shed suitable relative humidity varies depending on crop type plastic vegetable greenhouses built, generally required to maintain at 50-60% during the day, at night in the 80-90%. In order to reduce disease hazards, nighttime humidity should be controlled at about 80%. Plastic vegetable greenhouses manufacturers, Communications Technology, Beijing plastic vegetable greenhouses provided by Anyang City Communications Technology Co., 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.