3Van O. Effect of initial tree quality on yield [J]. Acta Hortieulturae, 1978,65 : 123-127.
4Sadowski A, Mackiewicz M, Dziuban R. Growth and early bearing of apple trees as affected by the type of nursery trees used for planting [J]. Acta Horticulturae,2007,732 : 447-455.
5Canada Nursery Landscape Association. Canada standard for nursery stock [S/OL]. [2010-09-20]. http://www. canadanursery.com/Page. asp? PageID=924&ContentID=841.
6American Nursery & Landscape Association. ANSI Z60. 1-2004 American standard for nursery stock [S/OL]. [2011- 02-24]. http://hort. ufl. edu/woody/americanstandard. shtml.
7Hewitt A,Watson G. Bare root liner production can alter tree root architecture [J]. Journal of Environmental Horticulture, 2009,27 (2) : 99-104.
8Bubcin T. The use of benzyl adenine in orchard fruit growing: A mini review [J]. Plant Growth Regulation, 2000, 32: 381- 390.
