密云县高岭公社栗榛寨大队是一个新发展的板栗产区,1965年以来共发展22000棵栗树。1975年后作为北京市农科院林研所的科研基点,发展了板栗良种,加强管理,使板栗产量由年产474斤逐年上升到1982年的47200斤。八年增产近100倍。目前栗树将进入盛果期, Miyun County, Miyun County chestnut walled squad is a newly developed chestnut producing areas, since 1965 developed a total of 22,000 chestnut trees. After 1975, as the research base of Forest Research Institute of Beijing Academy of Agricultural Sciences, it developed chestnut varieties and strengthened management so that the output of chestnut increased from 474 kg annually to 47,200 kg in 1982. Eight-year yield nearly 100 times. Chestnut tree will enter the current fruit period,