板栗是我国的重要经济林树种,其坚果是良好的果品和换汇率高的出口物资。但长期以来多用实生繁殖,良莠不齐,晚实低产,经济效益不高。据统计,全国平均亩产18.8kg。为了改变板栗的低产面貌,总结出良种密植技术措施,曾提高了产量,有过亩产千斤的高产记录,但变产幅度大,不易持久 Chestnut is an important economic tree species in our country. Its nuts are good fruits and export materials with high exchange rate. But for a long time multiply with real life, good and bad, late real low yield, economic efficiency is not high. According to statistics, the national average yield 18.8kg. In order to change the appearance of low-yield chestnut, summed up the planting of close planting techniques and measures, has increased the yield, have a record high yield per kilogram, but the rate of change is large, not easy to long-lasting