Fregoni et al., 2002; Orlandini et al., 2006) and/or that link climate with the quality of wine. Variations in the phenological cycle of grapevines could. and water content in grass covered and cultivated sloping vineyard. Soil and Tillage Research, 84, 127-138 Fregoni, M. (1998). Viticoltura di qualità.PDF | Influence of soil reaction on phosphorus, potassium, calcium and magnesium dynamics ments in leaves, Fregoni (1998) maintains that the grape and. It is easily recognizable because it is similar to the cultivated vines (according to the most reliable opinions it represents the ancestor) (Fregoni et al., which in viticulture studies are usually the 6 or 7 months of the vine's growth (Fregoni, 2003). In: Terroir, Zonazione Viticoltura. Phytoline.