GM 643-16 is an early ripening white wine grape from Germany. It has a short growing season with medium yield potential. Bred at Geisenheim this Vitis vinifera selection is a cross of Ehrenfelser x (Rulander x Gutedel). The selected clone for data analysis was GM 643-16, IC86.8509. The prime name of this variety is Geisenheim 643-16 and the selection has not been released.
Bud Burst Days (July 1=0): Medium 76.00
Flowering Days (July 1=0): Late 119.00
Veraison Rating: Medium 189.00
Harvest 22 Brix Days (July 1=0): Early 226.00
Seasonality (days): Short 156.00
Leaf Area Index (m2/m2): 1.85
Bunches Per Shoot: 2.00
Yield Potential: Medium
Berry Weight (g): 1.13
Total Soluble Solids (° Brix): 22.00
Titratable Acidity (g/L): Medium 4.49
Tartaric Acid (g/L): 5.45
Malic Acid (g/L): 3.55
Tartrate Malate Acid Ratio: Medium 1.54
Anthocyanins (mg/g): Unknown .
Phenolics (au): .
Yeast Assimilable Nitrogen (mg/)L: 273
Potassium (mg/)L: 1,680.00