Abstract:

This article analyses a prominent problem which there are lowyield, low-seed ratio and high empty bundle ratio in our Chinese Chestnut production and seeks for the theory why it appears in Chinese Chestnut.Chinese Chestnut(Castanea mollissima BI.) originated in China.Our output is the first position in world production and occupy one-fourth to one-third in whole world output(being 9.3×10⁴t in 1988, whole world output was 45.6×10⁴ t in the year). But our yield per area is lower.There are different reasons for low-yield production, among which high empty-bundle ratio is the main cause.So, the article reviews the mechanism of Chinese Chestnut Empty-Bundle result from embryo tissue, nutrients and hormone level.The results showthat the mechanism of Empty-Bundle is due to innormal embryo tissue or being unable to bear normaly or lacking B, P mineral nutrient element and hormone balance.Whiletime the article points out measures to solve Chinese Chestnut's Empty-Bundle and raise its the output, such as increasing fertilizer in soil and sprying nutrient element on leaf; removing superfluous male flowers to adjust the proportion of femate flower and male flower selecting pollenizer and fine breeds and strains.

Key words: Chinese Chestnut, Empty-Bundle, Embry o tissue, Nutrient, Hormone level