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大官杨,作为一个优良树种,在六十年代和七十年代初期,我省曾大力推广,十多年后的今天,大部逐渐成材,但也有相当一部分未能达到速生丰产的目的,需要改造和提高。根据鄢陵县林科所的研究,利用大官杨的采伐根茬改接毛白杨,是一条经济、简便的办法。其具体做法是:1、对生长不良的大官杨进行皆伐改造或结合采伐更新,于春季二、三月份树芽未荫发之前,在根桩地际以下15—20厘米处,选择通顺的主根或侧根,锯断后削平锯口,做为砧木。选择毛白杨优良类型一年生的条子为接穗,接穗长20厘米,一头削成斜面。2、嫁接时期以二、三月
As a fine tree species, in the sixties and early seventies, the governor Yang promoted vigorously in our province. Most of the ten years later, most of the trees have been gradually turned into materials. However, quite a few of them failed to achieve the goal of fast-growing and high-yielding crops. Transformation and improvement. According to Yanling County Forestry Branch of the study, the use of large Yang harvesting stubble poplar, is an economical and simple way. The specific approach is: 1, poor growth of the high-yang for clear cutting or combined with cutting and regeneration in the spring in February and March before the tree buds are not shade, the root of the pile in the following 15-20 cm below the ground, select the fluent Of the main root or lateral root, sawing flattened kerf, as rootstock. Selection of excellent types of white poplar good annuals for the scion, scion 20 cm long, a beveled slope. 2, grafting period in February and March