Comparison Study on Daily Environment Variation in 4 Types of Compound Cob Wall Solar Greenhouse in Ningxia Arid Sandstorm Area

In order to explore the suitable structure and type of greenhouses,daily change curves of the inner environment indices including light intensity,air temperature,relative humidity,soil temperature,dew point temperature were compared;And the building costs of 4 types of compound cob wall solar greenhouse were analyzed.The results showed that from the aspects of air temperature,relative humidity,soil temperature and dew point temperature,greenhouse 3 and greenhouse 2 were better than greenhouse 4 and greenhouse 1.The order of construction costs of the 4 types of greenhouse was greenhouse 3 greenhouse 2 greenhouse 1 greenhouse 4.According to comprehensive consideration,greenhouse 2 with compound cob walls(table brick wall) and full steel frame was superior to the others and it had a wide application and promotion prospects in Ningxia arid sandstorm area.