Dongzao jujube(Zizyphus jujuba Mill. cv. Dongzao) is regarded as the best late maturing and fresh cultivars of Chinese jujubes. With the rapid development of Dongzao jujube's industry in recent years, such problems as the degradation of fruit quality, trying to be first, blind introduction happened. Three comparison orchards, which located at Zhanhua county in Shandong province, Huanghua and Cangxian county in Hebei province were established in order to probe the cause of fruit degradation and variat...