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板栗在双受精作用完成，初生胚乳细胞分裂一圈游离核后，不再继续分裂，合子（受精卵）发育所需有机物质未能从胚乳细胞中获得，不能发育成胚，有少数不能形成有效八核胚囊以及幼胚发育中途天折，造成空篷。试验表明，在板栗雌雄蕊原基分化期（４月中旬）、胚珠形成期（５月中旬）和双受精作用前后（６月中、下旬）的三个时期供给外源营养元素，能有效地控制空篷的发生。
Chestnut in the double fertilization effect is completed, the primary endosperm cells split free nuclei circle, no longer continue to divide, the zygote (fertilized egg) the development of the required organic matter failed to get from the endosperm cells, can not develop into embryos, a few can not form an effective Eight nucleus embryo sac and embryonic development halfway day, resulting in empty canopies. The results showed that the supply of exogenous nutrients in three stages of chestnut stamen differentiation (middle April), ovule formation (mid May) and double fertilization (middle and late June) could effectively Control the occurrence of canopies.