Chestnut tree long-term not pruned, left to grow, sloppy management will cause low yield, poor quality. Specifically manifested in the following aspects.

(1) large branches and uneven distribution

Young chestnut tree buds in the axils of the leaves are symmetrical, sprouting to form branches are also symmetrical, forming a plane. As a result, the large branches at the base of live chestnut trees also show a plane, forming parallel and overlapping branches. Because of the strong apical dominance of the branches, often a few big buds in front to give birth to a strong branch, the following side buds to form a weak branch, these weak branches die year by year, the strong branch grows higher and higher, and constantly branching, and finally a lot of big branches, competing with each other to elongate, the formation of a rounded head shape, twigs in the periphery of the circle, the inner chamber of the light is not enough to form a big branch bald, the crown is high, most of the nutrients consumed in the growth of the branch and to maintain the life of the large number of branches in terms of activity, this is an important part of low yield of chestnut trees. This is an important reason for the low yield of chestnut.

(2) peripheral results

Natural growth of chestnut trees, fruiting parts are in the periphery, the inner chamber does not result. The reasons for this are: first, the mixed buds with female flowers are at the top of the branch, that is, the fruiting part is at the top of the branch; second, the mixed buds with female flowers must be a strong growth potential of the branch, the formation of the inner light insufficient weak branches can not be fruiting; third, the branch apical dominance is strong, the growth of the higher and higher, the inner branches of the poor nutritional conditions and the gradual death of the front branch, only the front branch continues to extend, thus forming the internal baldness. The leaves are mainly in the periphery of the crown, and the fruiting part is only the outer circle. From the appearance of the fruit quantity is considerable, in fact, the whole tree yield is very low.

(3) the phenomenon of large and small years is obvious

When the chestnut yield is relatively high, the tree consumes more nutrients, and at the same time the tree is tall and consumes a lot of nutrients in the branches, stems, and root system. Harvest year tree nutrient deficit, flower bud differentiation is seriously affected, the next spring the number of male flowers and not a lot, but can not differentiate female flowers, the formation of female flowers less, so fewer results, lower yield. Following the low yield, but also conducive to tree nutrient accumulation, the next year and make the yield increase, this is the yield of the big and small year phenomenon. General fruit tree management will produce this phenomenon, and chestnut more obvious. In many cases, a year after the harvest will also form two small year, that is, a year can not restore the tree, two consecutive years of low yield, and only after the recovery to the big year, resulting in chestnut can not be high-yield stable yield.

Reasonable pruning of chestnut trees, reduce the number of large branches, control the crown, increase and stabilize the number of fruiting branches, can prevent the appearance of the above phenomenon, so that the three-dimensional results, that is, the results of the live chamber, to overcome the phenomenon of large and small years, to achieve high yield and stable production, so the chestnut tree pruning is very important.