Slovenia has undoubtedly suitable location for table grapes production, but nevertheless there is still no data on grapevine varieties that were suitable for Slovenian conditions. In the three-year experiment (2014-2016) many grapevine varieties were studied, among which, 18 varieties planted on Pouzelca (Vipava) and Meranovo (Maribor) have received more attention. At the edible maturity of the studied table grapes, a berries size and weight, but also a content of total and individual sugars and acids were measured. Taking into account the obtained data of the same variety cultivated in different locations, the edible maturity of grape produced in Vipavska dolina was reached at least a week earlier than in Meranovo. Among studied varieties in Vipavska dolina, an above average quality was reached by varieties 'Presentabil', 'Prima' and 'Muscat blue', while in Meranovo by 'Arkadia', 'Fromuosa albae', 'Palatina', 'Nero' and 'Muscat blue'. However, most of the varieties are interspecific hybrids, that lower susceptibility to fungal diseases and therefore less use of fungicides were expected. Table grape production in Slovenia will need to pay more attention in next future, because the obtained results are only preliminary, and enthusiasts, growers of table grapes need them urgently.
COBISS.SI-ID: 8643193
The quality parameters of 20 different table grape cultivars, planted in Vipavska dolina were monitored in a three-year (2014-2016) experiment. At edible maturity the morphometric characteristics of the grape berries were measured, more precisely the contents of sugars, organic acids and vitamin C were analyzed with high performance liquid chromatography (HPLC), while the total phenolic contents were determined spectrophotometrically. The cultivars 'Muscat Italy', 'Cardinal' and 'Victoria showed the highest berry weight (7.3 to 9.1 g), while the cultivar 'Perlette' had berries with the lowest weight (2.1 g). The significantly lowest CIRG index (1.0-1.3) was ascribed to the cultivars 'Muscat Italy,' 'Perlette', 'Victoria', but the highest to 'Muscat Hamburg' (5.2) and 'Perlon' (4,8). Grape berries of the cultivar 'Muscat Blue' (147.3 g / kg) showed the highest content of total sugars, followed by 'Nero' (133.3 g/kg), while the lowest sugar content was measured in the ‘Michele palieri ' cultivar (75.9 g/kg). The lowest content of total analyzed organic acids was analyzed in the berries of the cultivars 'Nero' (6.8 g/kg) and 'Queen of vineyard' (6.8 g/kg), but the highest in those of 'Muscat Hamburg' (11.1 g/kg), 'Ribol' (10.8 g/kg) and 'Perlette" (10.5 g/kg). The cultivar 'Panse Precoce' had the significantly highest content of vitamin C (9.5g/kg). The calculated ratio among sugars and acids shows that grape berries of cultivars 'Michele palieri', 'Lival' and 'Muscat Italy' have a rather sour taste, while the berries of the cultivar 'Ora' have a sweet taste. The cultivars 'Nero', 'Esther', 'Muscat Blue' and 'Ribol' outstood in total phenolic contents. Based on our results, we can conclude that the introduced resistant cultivars have grape berries with a highly preferable chemical quality in comparison to other susceptible cultivars.
COBISS.SI-ID: 8720249