Agrobiological properties of some native technical grape varieties of Samukh district

The Samukh region has favorable soil and climatic conditions for growing valuable crops and is one of the regions producing a large number of grapes. For the first time in the Samukh region, the mechanical composition of technical grape varieties was studied: Bayanshir, Gara Serme, Gezel Gara, Khemesher, Shirvanshakhi, Tavkveri, Terbash, Madrasa, Rkatsiteli, Shemakhi marandisi. Among the studied varieties, the yield index of Bayanshire and Rkatsiteli varieties, which yielded 13 kg of yield from one bush, was superior to other varieties. The highest indicator for the average weight of the bunch was in the Gezel Gara variety (483.0±9.95 g), and the lowest was in the Terbash variety (225.0±10.23 g). In one bunch, the smallest number of berries was in the Gara gezel variety (65.8 pcs), and the largest number was in the Shirvanshahi variety (125 pcs). A smaller number of berries per 100 g had the Gezel Gara variety (11.6±0.36), and the Madras variety had a greater number of berries (37.5±0.21). The varieties Tavkveri (90.5±1.17) and Madrasa (90.0±0.91) had a high percentage of pulp in berries. As a result of the work carried out, it was found that the lowest juice yield was in the Shirvanshahi variety (82.8±1.46%), and the highest was in the Gezel Gara variety (86.0±1.38%). The lowest sugar content is in the Gezel Gara variety (16.0±0.65 g/cm3), and the highest in the Bayanshire variety (19.3±0.53 g/cm3). The Rkatsiteli variety had a high acidity (7.5±0.34 g/dm3), and the lowest acidity was found in the Bayanshire variety (5.8±0.20 g/dm3).