1, plastic
After the first year, trim the lateral branches that compete with the main branch and the lower branches; in the second and third years, repair the thick competition branches and trim a few lower branches; pruning branches every four years until they form 6 meters. Before the closure of canopy, the dry and young trees of the poplar are young. Before the light conditions in the forest are still good, the pruning or no pruning is less. Try to retain the large canopy to increase the photosynthetic area, but the competition branches must be removed. ) Choose only one; if the leading branch is dead and broken, it should stand on one side instead of the trunk to grow and grow into a new central leadership.
2, pruning
Trim the lower branches of the trunk at a proper time to gradually increase branching points. 1-3 years, a small amount of pruning. For 4-5 years, trim to 1/3 of the height of the tree. After 6 years, the pruning branches reach 1/2-1/3 of the height of the tree until 6 meters. For some trunks are very short, but the tree has grown up, can no longer be cultivated into a single tree, you can also cultivate the main branch of the branch as the main branch, increase the branch year by year, was dry type. After the poplar is closed, the trunk is 8-10 cm thick, and the dying twigs at the lower part of the canopy are removed. The canopy retains a dry height of 2/3, and the upper twigs only have to trim extra-thick branches and card neck branches. The large branch should be divided into two times to avoid excessive wounds. Trimming method. Trim to close to the tree trunk for pruning. The cut must be smooth, and it must not be left to scratch or tear the bark. Shearing can heal in those years; twigs are often erupted at the trimming and excision of the plastic trim, and should be wiped out in time at the end of spring and early summer. When pruning branches, for small branches, fast axe or machete are usually used to close the tree trunk and shave from bottom to top to keep the incisions smooth and tidy and to facilitate wound healing; for thicker branches, saws are preferred. Saw from the bottom up, then saw it from the top down to avoid tearing the bark, causing rough cuts and cracks.
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