Wertheim 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.?
[2]
Buler Z,Mika A,Treder W,et al.Influence of new training systems of dwarf and semidwarf apple trees on yield,its quality and canopy illumination[J].Acta Horticulturae,2001,557:253-259.?