The comparative analysis of the productivity indicators of several less-cultivated technical grape (Vitis vinifera L.) cultivars in comparison with the standard cultivar Ag Aldara was the focus of this study conducted in the Nakhchivan Region of Azerbaijan. The results revealed that in the studied grape cultivars, the main productivity indicators were relatively high, ranging from 73.7% to 84.8%. However, except for the cultivar AgKalampur (51.0%), the proportion of two-clustered shoots was quite low in other grape cultivars. In certain cultivars, the total number of fruitful shoots ranged from 10.6% (Khatmi) to 23.5%, having an association with the biological traits of Eastern grape cultivars. The average number of clusters per fruitful shoot ranged between 1.15 and 1.60, and the highest fertility coefficients varied from 0.84 to 1.35 clusters per shoot based on genotypes. Although the fertility coefficient of the buds on the canes with load was considerably low, the large size of the clusters ranged from 237 to 285 g. This ensured that, on average, the vineyards established with the studied grape cultivars yielded between 24.3 and 31.2 tons per hectare.
Grape (V. vinifera L.), cultivars, ecological farming, productivity indicators, fertility coefficients, vine, shoots, buds, clusters
The results based on the comparative analysis of less cultivated technical grape (V. vinifera L.) cultivars in the Nakhchivan Region of Azerbaijan revealed that the productivity indicators were quite high.