Spring jujube tree management
First, tree management 1, young trees dry shaping. Properly set early dry, low dry is conducive to early formation, early results. Generally should be 2 to 3 years after planting, when the tree height is more than 1 to 1.2 meters, it shall be dried, the height shall be about 80 centimeters, and all the following secondary branches or short sections shall be removed from the fixed position. 2, the results of tree pruning. Follow the principle of “trimming trees and shaping them with branches†to solve the main problems of ventilation and light transmission, and carry out moderate double cuts on the peripheral jujube branches, so that the annual growth of jujube heads is maintained at about 30 centimeters per year. After pruning, The total number of buds in jujube heads should be 1/8 to 1/6 of the entire tree. Second, under the tree management 1, fertilization. Spring fertilization includes the application of base fertilizer in early spring and quick-applied fertilizer in late spring. In the late spring, the quick-to-apply fertilizer was mainly nitrogen fertilizer, and it was carried out before and after germination in April to May. Each topdressing urea 0.5 ~ 1 kg, superphosphate 2 kg, young trees reduce it. 2, spring ploughing. Ploughing in the spring is carried out after the soil is thawed. The depth of ploughing is 30 to 40 cm. The depth from the trunk should be shallow to avoid breaking the big roots. 3, spring irrigation. In general irrigation, the hole irrigation and furrow irrigation are adopted. In the north, the irrigation is better during the germination period, and it is best to combine with topdressing. Third, pest control 1, scraping bark, spray lime sulfur mixture. It is best to scrape the old bark in winter and freeze the overwintering eggs. In early March, the whole tree was sprayed with 5 Baume of lime sulfur to eliminate the source of the disease. 2. Wrap plastic aprons or apply shellac. In the middle and late March of the middle of the year, a 6-10 cm wide plastic tape or glue on the lower part of the trunk was placed to prevent the insects from jujube and other pests from entering the tree.
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