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国外近几十年,国内近十几年,梨树栽培业上最重大的变革要首推密植栽培。密植栽培,不仅仅是栽殖密度的改变,而且围绕栽植密度的变化,树下树上各项管理,特别是修剪制度,也必须相应改革。自七十年代中期以来,我国所发展的梨树,几乎都是密植的乔砧梨树。栽植密度较过去增加了3～4倍,乃至更多。对于这些乔砧密植(简称乔密,以下同)梨树的修剪,既不可沿用过去稀植梨树的传统方法,也不能机械搬
In recent decades, nearly 10 years in the country, the most significant change in the cultivation of pear trees should be the focus of intensive cultivation. Close planting, not only changes in planting density, but also around the planting density changes, trees under the tree management, especially the pruning system, must also be the corresponding reform. Since the mid-1970s, most of the pear trees developed in our country are densely populated by Qiao anvil pear tree. Planting density increased by 3 to 4 times over the past, and even more. For the pruning of these anvil plants (Qiao Mi, the same below), the traditional methods of thinning pear trees can not be used either mechanically or mechanically