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通过环剥摘叶法和石蜡切片法对苹果梨花芽分化研究表明，苹果梨花芽生理分化期为短枝停长后１～３周（６月中旬），形态分化始期为短枝停长后３～４周（６月下旬），直到果实进入第２个迅速生长期前，持续近３０天。
The study on flower bud differentiation of apple pear by girdling method and paraffin section method showed that the physiological differentiation period of apple pear flower bud was 1 ~ 3 weeks (mid-June) ~ 4 weeks (late June) until the fruit enters the second rapid growing period lasting nearly 30 days.