1 Castanea henryi likes light and is drought-resistant and requires good drainage. Less pests and diseases, fast growth. Widely distributed in the south of the southern slope of Qinling Mountains and north of Wuling Mountains in China, not produced in Taiwan Province Province and Hainan. Born in hilly and mountainous areas at an altitude of 100- 1800 meters, it is common in deciduous or evergreen mixed forests.
2? Young leaves are densely covered with gray or gray-yellow stellate hairs on the back, and there are sparse single hairs on the midvein and lateral veins. The hairs of growing leaves gradually fall off and become hairless. The flower and fruit period is the same as that of Castanea henryi. The type specimens were collected from Emei Mountain, Sichuan. Born in the forest at an altitude of 1000- 1500m. It may be a natural hybrid of chestnut and Castanea henryi. When digging holes for planting, it is advisable to dig holes with a length of 80 cm, a width of 80 cm and a height of 80 cm in the fertilizer bed for early propagation, and at the same time control the planting density of each mu of field. The row spacing of 4×4 meters should be adopted at the initial stage of planting, and the ratio of main varieties to non-main varieties is about 4: 1. In the winter of the following year, the holes should be deepened and expanded, and about 50 kilograms of organic fertilizer should be added to each Castanea henryi, and 65,438 calcium, magnesium and phosphorus fertilizers should be applied. Then apply quick-acting fertilizer once in April-May to accelerate the growth of rootstocks. At the same time, suitable scions are selected for popularization and reproduction, and the proportion of varieties and the configuration of pollination trees are reasonably controlled.
3? Castanea henryi can be pruned three times a year after grafting for two or three years. When pruning, cut off the trunk at the height of 50-60 cm, select 3-4 main branches with suitable growth direction for cultivation, control the opening angle of pruning at 50-60 degrees, and pay attention to timely coring and adjusting the nutrient distribution of the tree, isolate the top advantage, promote the formation of low-stem and short-crown shape, further improve the ventilation conditions in the crown, promote early fruiting and high yield, and prolong the full fruiting period. Gravel loam with weak acidity and more organic matter is the most suitable growth environment. Shallow tillage should be applied in spring and autumn, base fertilizer should be applied in late autumn and early winter, and topdressing should be applied in spring and summer. When there is more organic matter in the soil, weeds grow easily. Therefore, intertillage and chemical weeding should be carried out in time to keep the soil fertile and loose.
4? The main pests of Castanea henryi are chestnut gall wasp, chestnut elephant, chestnut cutting weevil, Castanea henryi moth, scale insect and so on. Reasonable planting and pruning and appropriate sparse planting can inhibit the occurrence of pests and diseases. Pruning branches of pests and diseases in winter, especially in chestnut forest which is seriously damaged by chestnut gall wasps, has obvious control effect, and moderate pruning obviously reduces the population density of scale insects that can overwinter on branches in winter. Deep ploughing in autumn and winter, burying weeds in the soil and wintering places for pests can obviously reduce the harm of pruning elephants, chestnut elephants and chestnut moths.