Abstract: The average air temperature and soil temperature at 10cm depth in the wide-span plastic covered tunnel greenhouse were observed to reveal the temperature changes and to provide the scientific basis for the temperature regulation in the wide-span plastic covered tunnel greenhouse.The results showed that the air and soil temperature in the wide-span plastic covered tunnel greenhouse was 10.3℃ and 10.6℃respectively during the last ten days of November,while it reached 12.6℃ and 9.7℃ respectively during the first ten days of March.The average air temperature in the wide-span plastic covered tunnel greenhouse increased by 0.7℃ and the temperature difference between day and night decreased by 2.7℃ compared with that in the normal-span greenhouse.Both air and soil temperature increased by 1-2℃ by adding a simple thermal screen in the wide-span plastic covered tunnel greenhouse.

Key words: Horticultural facility, Horticultural facility, Wide-span plastic covered tunnel greenhouse, Temperature