In 2019, nearby village Planina in Vipava valley, we studied the growth, yield and the quality of the grapes and wines of four different combinations of rootstocks and clones of the 'Rebula' variety. In the experiment clones SI-32 and SI-34 of 'Rebula' variety and rootstocks SO4 and 420A were studied. At growth evaluation, we counted at combination SI-32 SO4 the lowest number (1,3) of unfertile and the greatest number of fertile (10,8) shoots per vine. At this combination we also measured the highest weight of cut wood (0,50 kg/vine) at winter pruning, therefore was defined as the most vigorous. The highest weight (165 g) of individual bunch was measured at combination SI-34 420 A, while the highest yield per vine (3,03 kg) at SI-32 SO4. At the SI-32 SO4 combination we also measured the highest sugars content (86 °Oe) in the grapes, while the lowest (81 °Oe) at SI-34 SO4. The highest total acidity in grapes (6,0 g/l) was measured at SI-34 420A, while the lowest (5,3 g/l) at SI-32 SO4. The highest content of the alcohol (11,8 vol%) was measured in the wine of SI-32 SO4, while the lowest (11,0 vol.%) at SI-34 SO4. The highest content of total acidity (5,7 g/l) was measured in the SI-32 42A, while the lowest (4,3 g/l) at SI-34 420A. The results of mesurements of the sugar-free extract stand out with the highest content (16,6 g/l) at the combination SI-32 SO4. We should remind that these results are just for one year and for the exact results the same experiment should be done at least one more time.
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