Prediction of “véraison” of Six Varieties of Grape by Berry Softening Curve Monitored on Vines by Nondestructive Vibration Method

Key Points

• The aim is to predict the maturation stage (véraison) of grape varieties by assessing berry softening over time.
• Measured third resonance frequency (f3) during the maturation process of six grape varieties.
• Utilized a non-destructive vibration method on vines.
• Monitored changes from immature to mature stages.
• The f3 frequency decreased as the berries matured.
• The decrease in f3 was approximated by an inverse sigmoid equation.