Seasonal evolution impact on Montepulciano grape ripening

In an environmental background characterized by climate change, the seasonal trend increasingly affects qualitative and quantitative expression of vineyards. The sugar concentration, titratable acidity, ratio sugar/acids yield were related with heat accumulation (growing degree days accumulation), calculated in different period grapevine cycle. 21.5 °Babo threshold has been reached Montepulciano grapes various years (2007-2019) even 40 difference. Over a 13 years, was influenced thermal evolution between March to July. relationship high coefficient determination (R 2 0.74) obtained acidity. According this forecasting model, increases 100 degree-days from June correspond reduction about 0.85 g/l acidity must at harvest associated increase 0.75 sugars acids. July correlated Montepulciano, is decrease 1.86 t/ha. crucial for grape quality Montepulciano.