The history and role of greenhouses: greenhouses range of applications under development. Especially for low temperature resist drought and sand hazards plays a major role in the alpine region, Shahuang and arid regions. Countries in the world for the development of agricultural production and has built greenhouses, Japan in the late 1970s greenhouses area of ??10-20 hectares. Spain 阿尔梅里利 area land area of ??315 square kilometers of all nursery greenhouses, is arid areas, in order to develop vegetable production and covers 120 square kilometers of greenhouses greenhouse nursery design, is the world's largest greenhouse. Features greenhouses: humidity conditions. Nursery greenhouses offer without ventilation, the shed up to 60-80% relative humidity during the day, often at night, about 90% up to 100%. Shed suitable relative humidity varies depending on the type of crop nursery greenhouses prices, 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%. Nursery greenhouses Communications Technology _ quote _ Shijiazhuang nursery greenhouses provided by Anyang City Communications Technology Co., Anyang City Communications Technology Co., Ltd. (www.aytlkj.com) (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. You can also access (www.aytlkj.com/supply_details_40454925.html), for more information about the company.