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紫玉又名早生高墨,原产于日本,属于欧美杂交种,我所于1985年从日本引入试种。该品种嫩梢灰白色,中等茸毛。卷须间断,中等长。幼叶微红,叶背密生黄褐色毡状毛,叶脉绿色。节间背侧绿色,腹侧具红色条纹。枝条椭圆形,有细槽,成熟枝条为红褐色。果穗大,圆锥形,平均穗重510克,最大穗重870克。果粒椭圆形,平均粒重13克,最大粒重17克。果皮紫黑色,中等厚。果肉质地细腻,汁液多,味甜有草莓香味,含可溶性固形物15～18％,品质优于巨峰,果肉
Ziyu, also known as early high-ink, native to Japan, is a European and American hybrids, I was introduced in Japan in 1985, trial planting. The variety of fresh shoots gray, medium velvet. Tendons interrupted, medium length. Leaves reddish, leafy back hairy brown felted hair, veins green. Internode dorsal green, ventral red stripe. Branches oval, fine groove, mature branches reddish brown. Ear large, conical, the average spike weight 510 grams, the largest spike weight 870 grams. Oval fruit, the average grain weight of 13 grams, the maximum grain weight of 17 grams. Peel violet black, medium thick. Flesh texture delicate, juicy, sweet strawberry flavor with soluble solids 15 ~ 18%, quality is better than Kyoho, pulp