商洛地区是全国核桃主产地之一,但所生产的核桃,大部为晚实类型。为了实现核桃早实丰产,于1981年春引进山东省果树研究所从新疆早实核桃中选击的元丰、阿七、上六三个新品系。引种区位于陕西省洛南石门山坡(秦岭南麓),属温暖带山地气候,光照较好、雨量适中,是当地晚实核桃分布 Shangluo region is one of the main producing areas of the country’s walnuts, but most of the walnuts produced are of late-night type. In order to achieve the early fruiting and high yield of walnut, in the spring of 1981, Shandong Province Fruit Research Institute was introduced into Yuanfeng, Asiatic and Shangliu three new lines selected from Xinjiang early-fruiting walnuts. Introduction zone is located in Luolan, Shaanxi Shimen slope (south of Qinling Mountains), is a warm mountainous climate, good light, moderate rainfall, the local late real walnut distribution