紫玉洋葱新品种是采用系统选择的方法，用优良单株经过8a4代定向选择，4a2代改良育成的紫皮扁圆形新品种，属中熟品种，生育期270 d左右；产量高，为97.5 t/hm2；品质优，鳞茎含维生素C 89.7 mg/kg、蛋白质0.96％、硒元素0.0339 mg/kg ；商品性好，商品球率大于80％；耐贮藏，干燥通风处可贮藏95 d以上；抗霜霉病，紫斑病；适宜河南省及周边地区种植。%Ziyu Onion ,a new variety of purple oblate ,was selected by the system selection meth-od ,with a good plant after 8 years of 4 generation of directional selection and 4 years of 2 genera-tion of improvement ,w hich characterized by a middle maturity ,grow th period of 270 days ,a high yield of about 97 .5 t per hectare .T he new variety had a bulb vitamin C content of 89 .7 mg/kg , protein content of 0 .96% ,selenium content of 0 .033 9 mg/kg .Its good commodity was well with a commodity ball rate greater than 80% and a storage period in dry ventilated place more than 95 d . It showed resistance to downy mildew and purple spot and was suitable for the cultivation in Henan and its surrounding areas .
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