Abstract: Traditional gravel and sand mulched field has a certain capacity of water and heat preservation,in order to choose feasible covering techniques in enhancing the production efficiency on it,the investigation of meteorological effect on three kinds of covering techniques on the gravel and sand mulched field such as coving with plastic film,covering plastic bowl and no covering has been done at the arid mountain area in Zhongwei,Ningxia.The results indicated that coving with plastic film and covering plastic bowl on the gravel and sand mulched field all facilitate to the seedlings' coming out,growth and yield;covering with plastic film had the best capacity on keeping moisture,while covering with plastic bowl had the best capacity on keeping soil temperature.Owing to the local arid climate and take the cost of each covering approaches into consideration,the covering of plastic film on gravel and sand mulched field can be feasible to plant watermelon and the covering of plastic bowl can be used in spring with lower temperature.

Key words: Covering techniques, Covering techniques, Watermelon, Meteorological effect