La distribuzione fogliare di un antitraspirante naturale per il miglioramento qualitativo delle produzioni viticole

In recent decades the increasing trend in global temperatures has affected the accumulation of sugars in the berries and then the alcohol degree in wines. The purpose of this study was to evaluate the effect of a natural anti-traspirant on the physiology and quality of the Sangiovese grapes , with particular focus towards the balance between technological and phenolic maturity. The use of vegetal anti-traspirant allows to limit transpiration by increasing the resistance to the passage of water vapor, with a consequent increase in the leaf water potential and improvement of the water status of the vine. Applications around veraison delay the maturation leading to a decrease of the sugar content, and an increase of the polyphenolic substances. The results show that the application reduced transpiration, stomatal conductance and photosynthesis by carrying out more the film-forming effect in the warmer months and driest vintage (2015). Overall, the treatment decreased the sugar content and raised the polyphenolic anthocyanins and improved the balance between technological and phenolic maturity, compared to untreated control.