板栗是我国特产的一种主要干果,其中以河北省燕山山区所产的板栗品质最好,栽培最多,年产量一般为2,200—2,500万公斤,占全国产量的38%。燕山板栗的绝大部分远销日本,是极少数几种能进入日本超级市场的中国商品之一,被誉为“东方珍珠”。但由于历来沿用实生繁殖,株间差异很大。为摆脱实生栽培的落后状态,实现良种化,自1973年开始,对燕山栗区的实生树,进行单株选优。从万余株实生树中,入选3百余个优系,经过多年的复查鉴定,筛选出十余个优系,又对它们的嫁接代进行了七年的比较试验。选出了早实丰产“3113”和短枝型“后20”两个优系。自1982 Chestnut is a special dried fruit of our country. Among them, the chestnut produced in Yanshan Mountain of Hebei Province has the best quality and the most cultivation. The annual output is generally 22,000-2,500 million kilograms, accounting for 38% of the national output. The vast majority of Yanshan Chestnut are exported to Japan, is one of the few Chinese goods that can enter the Japanese supermarkets, known as the “Oriental Pearl.” However, due to the fact that the use of real-life reproduction, strains vary widely. In order to get rid of the lagging state of real cultivation, to achieve the variety, since 1973, Yanshan Liqun real tree, single plant selection. From more than ten strains of real trees, more than 300 selected excellent system, after years of review identified more than ten selected system, and their grafting on behalf of the seven-year comparative test. Selected early fructification “3113” and spur type “after 20” two excellent lines. Since 1982