杨树如何修枝（How poplar pruning）.doc

杨树如何修枝（How poplar pruning） The improvement of poplar trunk and crown shape, can increase the length of the trunk and the perfect degree, accelerate the growth of trees, in order to obtain high no section of the wood. Object, pruning 1, with budding success: dry wipe bud dry, then cultivated in xingan. The stock of collateral (lower retention Support Branch) spring all the best repair except. 2, eye injury, dry, successful, except the following lateral branches. 3, it is more ideal to do natural work. Two, the time of pruning After pruning the homework must be trained for new stem. In the absence of joint stem, must not repair except the trunk or branches, tree growth vigor and influence, is not conducive to the stem. Pruning is generally in the success of joint stem that year after the spring (that is to stop the flow of sap in the season), to avoid the occurrence of the phenomenon of liquid flow. Otherwise, the wound healing effect of sap flow. Three, the pruning method There are mainly two kinds of poplar pruning method: One is a pruning (i.e. intensity pruning); Two is the time of pruning (i.e. two pruning). A pruning in good site conditions, and then the new tree vigorous stem height, diameter, parts are ideal, can make the following branches a trim. This period is called bayonet year. Two times in the poor site condition, tree pruning is weak, when the new height of stem. In order to, but the roughness is not ideal, you can first repair the base angle of small branches, retain the horizontal branches; to second years after the new stem, grow new branches, and then lower the horizontal branch of all repair. If the upright branch does not repair in the first year, and after second years, it will leave scars and difficult healing because of the rapid thickening. Methods: with a sharp knife or saw at the base of the collateral (no residual pile) all at once in repair. Has the condition, the wound may be LSSS (or wax) smear, to prevent infection and conducive to wou