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板栗树存在“棚而不实”即空棚现象.据调查北京这种树约占15%,个别地区可达90%,严重影响板栗产量.我们通过多年观察试验,现已找出造成空棚的原因及其解决办法.一、材料和方法试验从1983～1987年进行,试材为1977年嫁接燕山红栗,当时砧龄12年.试验地点在密云县巨各庄乡沙厂村.单株小区,3次重复,随机排列.1.花期喷硼试验(1983～1987年)喷硼浓度0.3%、0.5%、0.7%、1%.不喷硼为对照.
Chestnut trees exist “shed and not ” is the phenomenon of empty shed.According to the survey Beijing this tree accounts for about 15%, 90% in some areas, seriously affecting the yield of chestnut.We have been through years of observation and testing has been found to cause Reasons and solutions of empty sheds I. Materials and Methods The experiment was carried out from 1983 to 1987. The test materials were grafted Yanshan Hongliu in 1977 with an anvil age of 12 years and the experimental sites were located in Shachang Village, Jugezhuang Township, Miyun County Single plant plot with 3 replicates randomly arranged. (1) Spraying boron spraying experiment (1983 ~ 1987) Concentration of boron spraying 0.3%, 0.5%, 0.7%, 1%.