论文部分内容阅读
近年来,杂交杨树受到了广大农民的欢迎。如何进行合理修枝,促进杨树速生丰产,是当前生产中急待解决的课题。为了实现合理修枝及速生丰产的愿望,现将杂交杨树的修枝经验介绍如下: 1、修枝强度 (1) 当年新栽树的修枝:把树苗(2年生以上大苗)侧枝由1/2处剪掉,下余枝条的部分使之发芽,形成新树冠。这样可调整新植幼树体内水份的供需矛盾,减少水份蒸发,有利于成活。凡是当年发出的枝条,不分什么部位,应尽量保留,加大营养面积,促使根系生长,翌年再进行修枝控侧。 (2) 3—4年生幼树的修枝:其树冠应占树高的2/3。 (3) 5—6年生以上大树的修枝:使树冠占
In recent years, hybrid poplar has been welcomed by farmers. How to conduct reasonable pruning and promote poplar fast-growing and yielding is an urgent issue in current production. In order to achieve the goal of reasonable pruning and fast growing, the pruning experience of hybrid poplar now is introduced as follows: 1. Pruning strength (1) Newly pruned branches of the year: the saplings (2 years old and above) / 2 cut off, the remaining part of the branches so that germination, the formation of a new crown. This can adjust the contradiction between supply and demand of water in the new plantation tree to reduce the evaporation of water is conducive to survival. Where branches were issued that year, regardless of what position, should try to retain, increase the area of nutrition, to promote root growth, pruning and then control the following year. (2) Pruning of 3-4 year old saplings: their canopy should account for 2/3 of the tree height. (3) 5 - 6 years old or more tree pruning: the canopy accounted for