我场自1964年以来栽培板栗林4000余亩,都是用实生繁殖。由于板栗是异花授粉植物,其后代单株间产量和品质的差异悬殊,而且种性混杂,良莠不齐,造成单位面积产量低,是发展板栗生产的极大障碍。据我场几年来的调查,在同样的立地条件下,15年生的实生板栗株产最高只有5.2斤, My field since 1964 cultivation chestnut forest more than 4,000 acres, all with real breeding. As chestnut is cross-pollination of plants, the offspring of large differences in yield and quality of individual differences, and mixed species, good and bad, resulting in low yield per unit area, is the development of chestnut production a great obstacle. According to my field investigation over the past few years, in the same site conditions, 15-year-old chestnut yield of only 5.2 pounds,