6Wertheim S J, Wagenmakers P S, Bootsma J H, et al. Orchard systems for apple and pear: conditions for success[J]. Acta Horticulturae, 2001,557 : 209-227.
7Buler Z, Mika A, Treder W, et al. lntfluence of new training systems of dwarf and semidwarf apple trees on yield,its quality and canopy illumination[J]. Acta Horticulturac, 2001,557: 253-259.
8Widmer A, Krebs C. Influence of planting densiy and tree form on yield fruit quality of ‘Colden Delicious' and‘Royal Cala' applcs [J]. Acta Horticulturae, 2001,557 : 235-241.
9Caruso T, Ciovannini D, Marra F P, et al. Planting density-, aboveground dry matter partitioning and fnit quality in greenhouse grown‘ Flon daprince' peach (Prunvs persica L. Batseh) trees trained to ‘ Free standing Tatura' [J]. Hort Sci Biotechnol, 1999,74 : 547-552.
10Ellis S W, Grindle M. Effect of osmotic stress on yield and polyolcontent of dicarboximide sensitive and resistant strains of Neurospora crassa [J]. Mycol Res,1981,95:457-464.
