Management measures of planting and cultivating Chinese Chestnut in Spring

Spring is the period of flower bud differentiation, spring bud sprouting and flowering of Castanea mollissima. In order to ensure yield and harvest, management should be strengthened. Water it. Spring is the period of concentrated construction of various organs of Castanea mollissima. Metabolism and nutrition are in urgent need of water. Irrigation before sprouting in early spring can promote the formation of female flowers and is beneficial to the growth of branches. Local Chinese chestnut is mostly planted in mountainous and hilly areas, with thin soil layer and poor soil moisture conservation performance, so it is necessary to cover grass to preserve soil moisture. Wipe the buds. When the buds sprout, erase the excessive buds in the middle and lower part of the strong branches, leaving 4-5 large buds and 2-3 buds in the medium branches. Sprouting is carried out according to the principle of removing, leaving, densifying and sparse. Pick the heart. Some branches grow obviously in two years after grafting, which will inhibit the growth of other branches and affect the formation of tree crown. When the new shoot is 20 cm long, remove the tip 1 cm 2 cm; when the secondary and tertiary shoot length 30 cm, remove the tip 7 cm 10 cm. In this way, the young trees can form more fruiting mother branches and increase the number of female flowers. Go male. Without artificial control, the ratio of male flowers to female flowers is usually 20-50 ∶ 1. Too many male flowers will consume a lot of nutrients and reduce the yield. Therefore, it is necessary to remove most of the male inflorescences when they are 2 cm long, leaving only 3-5 inflorescences at the top of the shoot, so that the ratio of male to female flowers is about 5 ∶ 1. In addition, the application of potassium fertilizer was also beneficial to inhibit the overgrowth of male inflorescences. Fertilize. For high yield of Chinese chestnut, in addition to conventional application of nitrogen, phosphorus and potassium fertilizer, emphasis should be placed on boron fertilizer and zinc fertilizer. Master the mixture of 0.2% borax and 0.2% zinc sulfate when the female inflorescence appears, once every 7 days, 2 times in a row.