First, the pruning time
The pruning of deciduous trees and shrubs should be carried out after defoliation and before germination in the following year. Trees with severe bleeding (such as birch, walnut, Pterocarya stenoptera, Acer truncatum, Platanus acerifolia, etc. ) must be carried out in the growing season without bleeding, otherwise a large amount of juice from the wound will cause serious damage to the plant. Tree species should be seen after flowering.
Second, the principle of pruning
1. The height of branch points of street trees should be neat, and the height of branch points of the same tree species on the same road should be consistent, which does not hinder the passage of vehicles and pedestrians. Generally, 2.5 -4 meters is appropriate.
2. For tree species with obvious trunk, the central main branch should be protected from damage. Trees whose principal axes are not obvious should be pruned according to their characteristics, such as locust trees and willow trees, and trimmed into umbrella-shaped or steamed bread-shaped, so that the trees are neat and beautiful.
3. For the trees with lines on them, the trees can be happy to make them grow to both sides, so as to avoid the contradiction between trees and lines. Trim the drooping branches in time to avoid affecting the driving of vehicles and pedestrians.
4. Newly planted street trees should be properly pruned after one year, so as to expand the root system of Sophora japonica and prevent lodging.
5. For Sophora japonica, if the crown is aging, pests and diseases are serious or other injuries have no future, but the trunk is still strong, all the trunks can be cut off from above the branch point to make it grow new branches, commonly known as "wiping the head to update". This method is suitable for non-spindle tree species.
Three. Matters needing attention in pruning
1. For pruning tasks with large pruning amount, high technical requirements and long construction period, make detailed pruning plans (including time, personnel arrangement, tool preparation, construction progress, branch treatment, site safety, etc.). ) should be made before construction.
2. Pay attention to the weather changes when pruning, and choose windless and sunny weather for construction.
3. Before pruning, technicians should comprehensively and carefully observe the growth habit, tree shape and surrounding environmental conditions of the whole Sophora japonica tree, so as to comprehensively consider the pruning essentials and prune it in the order of "from base to tip, from inside to outside" to avoid blind pruning, resulting in errors or missed pruning.
4. For the pruned branches, the principle of "removing the weak and retaining the strong" should be followed, and the branches with diseases and insect pests, withered branches, perforated branches, arched branches, crossed branches, overlapping branches and branches with too small angle should be pruned, so as to achieve the purposes of ventilation, light transmission, reduction of cross contradiction with air lines and reduction of diseases and insect pests.
5. The direction and angle of branches should be determined according to the growth habit of the whole tree and the characteristics of its surrounding environment.
6. When pruning, special attention should be paid to the relationship between the incision and the new bud, that is, the slope is opposite to the direction of the new bud, its upper end is flush with the bud end, and its lower end is flush with the bud waist. You can visit this website to gain more experience in raising seedlings. Some of the things summarized above are very good. You can see more.
7. Trim accurately, steadily and quickly, and avoid splitting branches.
8. When cutting thick side branches, you should first use a saw to cut them into 1/3 to 2/5 from bottom to top below the base of the thick branches, and then cut them from top to bottom slightly in front of the base to avoid splitting the trunk.
9. After pruning, apply protective agent to the wound in time. (such as yellow paint, lead oil, waxing, etc. )
10. When pruning, special attention should be paid to the safety of staff, people around and vehicles.