The winter pruning is a very important ampelotechnic measure in the vineyard representing a basis for a new wine quality vintage. In our own vineyard with 'Rebula' grapevine variety a triple block study with three treatments was conducted in 2015. A single guyot with a horizontally bound cane (EG), a single guyot with an arch-shaped cane (L) and a cordone speronato (CS) were introduced. We wanted to determine the impact of the modified training system on the quantity and quality of the ‘Rebula’ grape and wine. At the beginning of the growing season, we recorded a vine growth and fertility potential. Significant differences were observed in the number of buds per vine, where CS and L had a significantly higher number of all buds than EG, while the difference in fertile and unfertile buds among treatment were not noticeable. L had 20% higher number of the inflorescences than the other two treatments. During the growth season, all the ampelotechnic measures were conducted. At harvest, no significant differences in the grape quality among treatments were observed. Significant differences among treatments were found in alcohol content of the wine (11.4 vol.% at CS, 10.4 vol.% at EG and L), total extract content (CS 21.6 g/l; EG and L approx. 20.2 g/l), reducing sugars (CS 1.17 g/l; EG and L approx. 0.8 g/l), total acidity (CS 4.7 g/l; EG and L approx. 5.3 g/l), and volatile acidity (CS 0.09 g/l; EG and L approx. 0,065 g/l). Among organic acids, a significant difference in the tartaric acid content (CS 2.4 g/l; EG and L approx. 2.8 g/l) was recorded, only. The study was conducted only in vintage 2015 and for obtaining a better knowledge regarding the impact of modified training system on ‘Rebula’ grape and wine quality it should be done at least three consecutive vintages.
|
