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日本长野县1980年矮化砧树栽培面积突破一千公顷占苹果总面积10%以上,今后仍有急剧增加的趋势。该县采用 M_(26)、M_9矮化性强的砧木进行高密栽植。这种高密栽植之所以能顺利地不断地发展,是由于该县受积雪等影响较少,加之生产者掌握了高密栽培技术要点的缘故。矮密栽培取得了良好成效,有很大面积5～6年生的矮化果树,均实现了早期丰产、提高品质和节省劳力的目的。其中高产的亩产
In 1980, the area of dwarfing anvil trees in Nagano Prefecture in Japan exceeded 1,000 hectares, accounting for more than 10% of the total area of apple trees, and there is still a sharp increase in the future. The county uses M_ (26), M_9 dwarfing rootstock for high density planting. The reason why such high-density planting can smoothly and continuously develop is that the county is less affected by snow cover and the like, and producers have mastered the key points of high-density cultivation techniques. Dwarf cultivation has achieved good results, a large area of 5 to 6 years of dwarfed fruit trees, have achieved early harvest, improve quality and save labor purposes. One of the high yield of mu produce