Sunlight greenhouse and plastic greenhouses are main facilities for vegetables cultivationin the winter and early spring of north China. Because of lacking the heating and lightingequipments, a long-period condition of suboptimum temperature and suboptimum PFD existin cultivation facilities, causing the physiological mechanism of cucumber imbalanced.Therefore, the growth, development, yield and quality of cucumber inhibited. This hasbecome the main limiting factors for the high yield and quality vegetable c...