我国寒带地区 ,由于冬季寒冷、无霜期短、有效积温和光照不足 ,“红地球”、“皇家秋天”和“晚红”等露地生产栽培 ,果实成熟度较差或不能成熟 ,只能栽培极早熟和早熟品种 (如“京亚”、“巨峰”、“京秀”、“沈阳早红”和“优昵坤”等 ) ,这些品种在生产中存在低产、果实酸 In the frigid regions of our country, due to cold winters in winter, short frost-free period, insufficient effective accumulated temperature and light, “Hong Earth”, “Royal Autumn” and “late red” and other open-field production and cultivation, the fruit maturity is poor or can not mature, And precocious varieties (such as “Jingya”, “Jufeng”, “Jingxiu”, “Soybean” and “Youyijun”), these varieties have low production in the production of fruit acid