Variation of greenhouse air humidity: plastic film closed strong, the greenhouse air with outside air exchange hampered insulation, soil evaporation and transpiration of water vapor foliage difficult diverge. Therefore, shed humidity. During the day, under greenhouse ventilation, air shed 70-80% relative humidity. After the rainy days or irrigation of up to 90%. Greenhouse air relative humidity decreases as the temperature increases, often to 100% at night. Shed after cold wet air condenses into water film or droplets attached to the inner surface of the film or plants. Waterlogging of low-lying land can not shed construction, you must first dig drainage ditches and then build greenhouses; the water table is too high, easy anti-pulp land, the soil must be multi-pad to greenhouse construction after heightening terrain. Otherwise, the ground temperature is low, excessive soil moisture, is not conducive to the crop root growth. Greenhouse construction site to be watered, convenient transportation, power supply equipment greenhouses insulation is to manage and product transportation. The north-south orientation of greenhouse construction should be uniform wholesale extension of the insulation, to the east and west side of the shed, then shed light distribution. The distance between the shed and the shed around, is shed 2/3 high. The distance between the two is too large shed, waste land, too close to the impact of the greenhouse effect translucent and airy, and films such as fixed job is not easy. Industrial insulation was widely St. agricultural machinery, Tianjin insulation was provided by Shouguang City, Canton St. Agricultural Machinery Limited. Shouguang City, Canton St. Agricultural Machinery Co., Ltd. (www.sdguangsheng.com) Shandong Weifang, a leader in agricultural machinery, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. In Canton St. agricultural machinery leadership with the staff warmly welcome all inquiries negotiations to create a wide St. agricultural machinery a better future.