板栗空苞就是栗棚中没有栗子，群众称“哑巴栗子”、“哑栗树”。空苞现象是板栗生产中各地普遍存在的问题，严重影响板栗产量。据调查，板栗正常生长的地区平均有１５％的空苞率，个别地区可达５０％，更有甚者达９０％，尤其是生长在山坡上方地块的大树，以及经嫁接后刚开始 Chestnut empty bud chestnut chestnut is no chestnut, the masses called “dumb chestnut”, “dumb chestnut tree.” The phenomenon of empty buds is a common problem in chestnut production and seriously affects the yield of chestnut. According to the survey, chestnut normal growth area of ​​15% of the average rate of empty broom, in some areas up to 50%, and even worse, up to 90%, especially in the hillside above the growth of large trees, and just after grafting