Abstract Taking strawberry‘Hongyan’ as test material,this study compared the effects of PO and PE film covering materials on greenhouse environment conditions,including temperature,humidity,illumination and strawberry yield and quality in over-winter sunlight greenhouse. The results showed that using PO film the average temperature of greenhouse was about 1 ℃ higher than that using PE film. The heat preservation was better,humidity was suitable,and lightening effect was also good in greenhouse using PO film. Besides,the strawberry yield increased by 23.27%,rotten fruit percentage was reduced ,contents of soluble solids and VC,sugar/acid ratio were all increased obviously,and the strawberry tasted even better.
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