A Comparison Study on Inner Environment Daily Variations of Trough Type Solar Greenhouse in Northwest Arid Area in Winter

The changes in greenhouse environment of trough type solar greenhouse was studied by‘Wenshiwawa',from the National Agricultural Information Engineering Technology Research Center.Structure of trough type solar greenhouse,the internal light intensity,air temperature,air relative humidity,dew point temperature,soil temperature and other environmental parameters were measured in extreme cold conditions in arid region of Ningxia.The results showed that through the comparison of measured curve greenhouse structure and internal environment,it was found the greenhouse structure between greenhouse and plastic shed,but the environmental performance of groove type greenhouse was similar to the greenhouse(plastic shed hadn't the production capacity in winter),trough type solar greenhouse insulation was significantly lower greenhouse aspects of performance,especially it was about 30%of greenhouse in the minimum temperature.Through the span of three kinds of environmental parameters in greenhouse trough comparison,12 meters was better than 10 meters,10meters over 8meters.At the minimum temperature(insulation was covered under a short time,10℃air temperature0℃,8℃soil temperature3℃),conditions of trough type solar greenhouse were to meet needs of the leek and other hi cool leafy vegetables anniversary production,it could be to meet fruit vegetables in early spring or late autumn.This kind of production was to fill and conventional between greenhouse cultivation and plastic shed cultivation,it was good economic benefits.Trough type solar greenhouse had a good economic and social benefits,which would be a great potential for replication in area of the water table was less than 3meters in Ningxia and northwest arid zone.