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矮化密植栽培是当前国内外苹果生产的总趋势。朝阳地区,近几年发展的密植(2.5×4m)苹果树已超过1500万株。对这些树应如何整形已成为亟待解决的问题。据此,1987年以来,我
Dwarf and dense cultivation is the current trend of apple production at home and abroad. Chaoyang area, in recent years the development of dense planting (2.5 × 4m) apple trees have more than 15 million. How to shape these trees has become an urgent problem to be solved. Accordingly, since 1987, I