With the growth of chestnuts, tree holes are enlarged every year. The method is to open an annular groove with a depth of 80 ~ 100 cm and a width of 50 ~ 60 cm with the outer edge of the planting hole as the boundary. When digging, separate the subsoil from the topsoil, then fill the topsoil and fertilizer at the bottom, and cover the rest with the leadership. Fertilization: organic fertilizer is mainly used in the circle, with 20 ~ 30 kg of organic fertilizer applied to young trees and 50 kg of phosphate fertilizer applied to fruit trees at last. In the final fruiting period, 20 kg of nitrogen fertilizer per mu is applied to the trees during the growth of spring shoots, and 20-30 kg of compound fertilizer per mu is applied 20-30 days before harvesting. Irrigation: chestnuts are drought-tolerant, but they must be timely and appropriate. Irrigation capacity is high and stable. The main water requirements of chestnut are in germination stage, new shoot growth stage, fruit volume increase stage and after harvest to before freezing.

2. Pruning of young chestnut trees: the tree shape popularized in chestnut production is mainly happy, and its shaping method is to cut short the trunk at a height of 50-60 cm to promote the young trees to grow far branches in the shaping zone, select 2-3 branches with good angles and strong growth as the main branches, select the second main branch in the following year, and leave 2-4 edges on 1 main branch. Commonly used pruning methods include short cutting, thinning, slow release, coring and so on. Pruning of mature fruiting trees mainly includes the selection, preservation and cultivation of fruiting mother branches and fruiting branch groups, as well as the retraction and renewal of perennial branches.