The grapevine (Vitis vinifera L.) of the 'Refošk' variety is a local and domesticated variety traditionally grown also in the winegrowing district Kras. The most typical breeding form in the Karst is the higher production form, the so-called Karst latnik, however, due to the numerous shortcomings of the latnik itself (expensive reinforcement, covering of young stock and shading of grapes, the emergence of diseases, difficult protection, etc.), new forms of cultivation are already being introduced, most often Guyot, which give excellent results. In order to avoid excessive evaporation of water from the soil, the Karst wine-growing region recommends tillage or soil loosening up to five times a year. The prevalence of the grape production of the 'Refošk' variety and wine production of teran PTP wine in the Kras in the period from 2006 to 2020 was determined using data from the Register of Grape and Wine Growers and the Archives of Institute of agriculture and forestry Nova Gorica. According to the obtained data, we evaluated the average quality of grapes and wine from the 'Refošk' variety. The variety 'Refošk' covers 75 % of the Kras winegrowing district. In the last decade, the production of the 'Refošk' variety in the Kras has decreased for 7%. The average quality of grapes of the 'Refošk' variety in the period 2006-2020 could be described as: average weight of 100 berries around 222.2 g, average sugar content 16 °Brix, 14.7 g/l total acidity and 8.8 g/l average malic acid content. In the period 2006-2020, the highest average alcohol content of 11.9 vol.% was in the selected Teran PTP wine, followed by Refošk wine with 11.7 vol.% and teran PTP with 11.6 vol. %. The highest average lactic acid content in the recorded period was in the selected Teran PTP wine (2.2 g/l), followed by the Teran PTP wine (2.1 g/l). In the period 2006-2020, Refošk wine had the highest average content of reducing sugars (3.6 g/l), followed by selected Teran PTP wine with 1.6 g/l and Teran PTP with 1.5 g/l.
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