Study on transformation technology for chestnut forest of seedling propagation type

Combining with the causes of low yield chestnut forest of seedling propagation type in Hunan,we expounds two aspects of solution with varieties and planting density improvement. The results show that the per unit crown area production of new breeding varieties of Chinese chestnut 7,8,9 and 11 are improved greatly than the Tielitou,Chinese chestnut7 is the highest yield with 502 g / m2 and increased by 40%,other varieties of increased between 20% and 30%. The crown average area of Chinese chestnut 8 is the smallest,and the variances among individuals are small. The fruit number of Chinese chestnut 7 per unit crown area is highest( up to 17),while per fruit weight is smaller( about 12 g). The fruit number of Chinese chestnut 9 and 11 per unit crown area are small,but per fruit weight are bigger( up to 14 g). Chestnut forest density should be with 3 m × 4 m for thinning.