中国林科院林研所、山东省果树所等单位从70年代开始进行了早实核桃新品种选育研究。共调查实生树10万多株,人工杂交组合50多个,获杂交子代苗2000多株,在11个省、市(区)建立无性系测定园和区试园1500多亩。“七五”期间汇集了九个省、市筛选出的36个最优无性系,在豫、晋、陕、辽进行评比及区域化试验。评定出我国第一批16个早实核桃新品 Forest Research Institute of China Academy of Forestry, fruit trees in Shandong Province and other units from the 70’s began to carry out a premature seedless walnut breeding research. More than 100,000 live trees and more than 50 artificial hybrids were surveyed. More than 2,000 hybrid seedlings were obtained. More than 1,500 mu of clone test gardens and district test gardens were set up in 11 provinces and cities (districts). During the “Seventh Five-Year” period, 36 optimal clones selected from nine provinces and municipalities were collected, and the competitions and regionalization tests were conducted in Henan, Shanxi, Shaanxi and Liao provinces. Assessment of China’s first batch of 16 premature walnut new products