核桃新品种元丰的选种技术,是核桃良种选育研究课题的一部分.从1972年开始,到1979年选出,前后共经过了八年时间。其内容如下: 一、课题的提出及目的任务: 核桃是主要的木本油料果树,核桃生产在我省有悠久的历史.经过劳动人民的生产选择,培育了许多地方核桃优良品系(例如:历城鸡 Selection of a new walnut variety, Yuanfeng, is part of a research project on the breeding of walnut seeds. From 1972 to 1979, it took eight years. The content is as follows: First, the topic proposed and the purpose of the task: Walnut is the main woody oil fruit trees, walnut production in our province has a long history .After the working people’s production choices, nurturing many local walnut fine lines (for example: Calendar City chicken