2Jackson DI.Lombard PB.Environmental and management practices affecting grape composition and wine quality -areview.Am.J.Enol.Vitic.,44,1993.
3Morinaga,Yakushiji,Koshita.Effect of fruit load levels on root activity,vegetative growth and sugar accumulation in berries of grapevine.Acta Hort.512:ISHS 2000.