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由中国林科院主持,全国9个单位参加承担的国家“七·五”林业重点攻关项目“早实核桃新品种选育”研究,经过几年共同努力,选育出我国北方首批核桃新品种16个。早实核桃新品种选育的主要指标是:适合华北山地、西北黄土高原、西南高地、新疆南部绿洲四大产区的生态环境。具有早实丰产特性,即嫁接苗栽植后3年,及在5龄以上砧树上高接后第三年,每平方米冠幅垂直投影面积内产仁量在170g 以上。坚果品质为优良,即取仁易,可加工成半仁至1/4仁;出仁率在50%以上,以55%～65%仁不外露为理想;仁色黄白、浅黄、浅琥珀
By the Chinese Academy of Forestry presided over the country’s nine units to participate in the national “7.5” forestry key project “early seedless walnut new breed breeding” research, after several years of joint efforts, the first batch of China’s northern new walnut Variety of 16. The main index of early seedless walnut breeding is suitable for the ecological environment in the four producing areas of North China mountainous area, Northwest Loess Plateau, Southwest Highland and southern Xinjiang oasis. With early yield characteristics, that is, grafted seedlings planted 3 years after planting, and in the fifth instar above the anvil tree on the third year after the height, the vertical projection area per square meter of crown width of more than 170g. Nut quality is excellent, that is, take Ren Yi, can be processed into half kernels to 1/4 kernel; kernel rate above 50%, with 55% to 65% kernel is not ideal for exposure; beige yellow, light yellow, light amber