High yield planting techniques of Castanea mollissima

1. Fertilizing pre-anthesis fertilizer in spring can apply 300 ~ 400 grams of urea and 200 ~ 300 grams of calcium, and 6 ~ 7 grams of borax per square meter. During the expansion period of July fruit bracts, the plant applied 0.7 ~ 1 kg of strong fruit fertilizer and three-element compound fertilizer. From June to October, 5 grams of borax solution and 5 grams of paclobutrazol were applied per square meter. Once every 30 days, 3 ~ 4 times. After fruit harvest, overwintering fertilizer was applied again, 40 ~ 50 kg of pig, cattle manure or soil fertilizer, 0.7 ~ 1.5 kg of calcium magnesium phosphate fertilizer. In addition, 0.2% borax solution, 0.3% urea and 0.2% potassium dihydrogen phosphate mixture were sprayed twice every 10 days to improve the fruit setting rate. The mixture of 0.3% urea, 0.2% potassium dihydrogen phosphate and mancozeb was sprayed every 20 days to promote the growth and development of branches, leaves and fruits. 10PPm2 and 4Mel D solution were sprayed once after fruit harvest to promote flower bud differentiation and nutrient accumulation. Second, trim the chestnut and enjoy the light. The overgrowing elongated branches and dense thin and weak branches should be removed in time to make the trees ventilated and transparent, and the work of controlling and wiping them should be done well in spring to promote secondary shoots. The male inflorescences which are too dense and weak should be cut off as soon as possible, and the fruiting branches with female flowers can be truncated or coring at 3 ~ 4 nodes above the female inflorescence. Wangding chestnut trees which do not blossom for many years or only have male flowers can use wire constriction to bind the main branch 1 ~ 2 times, or use spiral ring cutting to promote the number of flowers and the formation of female flowers. The hanging of the iron wire was carried out from August to September and released before the tree sprouted in the following year. Circumcision or engraving was performed in 9-10 months, and the xylem should not be injured. 3. Castanea mollissima is a cross-pollinated fruit tree of the same plant. More than two pollinated varieties should be planted in the orchard to facilitate pollination. When the variety is single, it can be pollinated artificially to protect fruit, and the male flowers are collected before 10:00 or after 3 pm on a rainless day. When there are many trees or tall trees, they can be pollinated by shaking 3 ~ 4 times starch in the crown with gauze bags and pollinated once every 3 ~ 4 days, twice in a row. When the chestnut has more fruit, the fruit should be thinned in time, and the ratio of leaf to fruit should be controlled at 20:1 ~ 25:1. 1 ~ 2 bracts can be left on the medium and short fruit branches, 2 ~ 3 bracts on the flower and fruit branches, the middle fruit with strong growth, the apex fruit on the short fruit branch, and small, deformed, overdense, disease and insect pests and empty bracts.