A, deciduous tree logo
1, tree height, straight trunk, street tree trunk height 2.0-3.5m, Yin Ting trunk height1.8-2.0m;
2.DBH 5- 15cm；
3, the main branches are evenly distributed, the crown is full and symmetrical, and the branches and leaves are healthy;
4. The root system is developed and healthy.
Second, how to cultivate the trunk of seedlings?
1, pruning
Select excellent tree species for field planting. Pruning should start in the second year, cutting off the old branches and dead branches at the lower end of the seedlings, as well as the pests and competitive branches at the upper end. If the seedlings are small, you can temporarily retain the top advantage, which is convenient for later drying.
Pay attention to pruning, and the height under the branches of the tree should not exceed 1/3 of the height of the tree, so as to maintain a reasonable proportion of dry height. After pruning, the overall tree shape of seedlings will appear, and the aesthetics will gradually improve.
When pruning, the cutter should be disinfected in advance, and the incision should be smooth, and the notch width should not exceed 1/4 of the trunk width at the same position. In order to prevent the infection of diseases and insect pests, the wounds of seedlings need to be disinfected after pruning.
2. Trunk modeling
When raising seedlings, we should pay attention to the standards of vertical stem and trunk shaping. There are two kinds of seedlings used in the market: full crown seedlings and truncated seedlings. Now full crown seedling is a trend. In the process of cultivation, the natural tree shape of seedlings should be maintained, that is, the original trunk of seedlings should be maintained, and it should not be cut off or made into other shapes in the subsequent growth process. Here, it is enough to keep the saplings growing naturally and the trunk upright without bending or deformation.
Truncated seedlings are also commonly used seedlings. Transplanted seedlings are mainly cultivated by cutting. First of all, we should keep the natural form of transplanted seedlings and cultivate healthy roots. When the trunk grows to a certain extent, it will be cut off. Multiple relays are required. When the height of the seedling trunk reaches 1.5 meters, it will be cut down again. Then, we will keep strong branches and cultivate the height of the trunk to more than 2.5 meters, so that the seedlings can grow tall and smooth.
3, defect adjustment
In the process of seedling growth, some trunk problems will occur, such as trunk bending, trunk damage and knot scar. If a similar situation is found, it should be adjusted in time to change the growth morphology of seedlings.
For the curved trunk, 3 ~ 5 vertical wounds can be cut on the inner side to reach the xylem, so that in order to heal the wounds, the curved part of the trunk of the tree will grow inward and grow in the opposite direction to the curved part, and the trunk will gradually straighten. This method can be done/kloc-0 times or more according to the situation until the trunk of the seedling is completely straight.
If the trunk of a seedling is damaged by external force, machinery or man-made, it will be scarred and should be cured in time to make the trunk perfect. First of all, the impurities and sundries in the seedling wound should be removed to make the wound edge smooth and tidy, and then disinfectant should be applied. If the bark of the injured part is still there, closely connect the fallen part with the trunk, then cover it with a film and bind it with a rope, which can promote wound healing and make the surface of the injured part smooth.