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中国农业大学许启凤利用国内和美国的优良草交种选育二环系．在选育过程中又导入热带亚热带种质并用转育的方法提高赖氨酸含量，成功地育成了具有突破性的玉米新品种农大108。
Xu Qifeng of China Agricultural University makes use of the fine grass of China and the United States to breed the second ring system. During the breeding process, the tropical and subtropical germplasm was introduced and the lysine content was increased by the method of transplanting. A breakthrough new breed of Nongda 108 was successfully bred.