Institute of Agriculture

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Author: search.filters.author.Poposka, HristinaHas files: No

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    A comparative analysis of sensory and chemical properties of grape rakija from different Macedonian producers
    (University of Banja Luka, 2026-03-05)
    Rajchin, Viktor
    ;
    Gjosheva Kovachevikj Marija
    ;
    Korunovska, Biljana
    ;
    Beleski, Klime
    ;
    Taseska-gjorgjijevski Milena
    Rakija is a strong alcoholic beverage, deeply rooted in Macedonian cultural heritage, where quality varies significantly between industrial, small-scale, and traditional home producers. This study evaluated sensory and chemical differences among three types of producers using 30 samples of rakija from grapes (10 per group). The chemical analysis included gas chromatography (GC) for volatile compounds and analytical methods for alcohol content, specific gravity, and extract. The sensory analysis was performed by a trained panel (6 assessors) following OIV 100-point scoring scale. Spearman’s rank correlation was used for statistical data analysis. Sensory results revealed greater variability in odour and taste (CV 14–29%). Isobutanol showed a significant negative correlation with quality (ρ = -0.43 to -0.46, p < 0.017), while extreme variability in esters (CV >100%, ethyl acetate up to 5,654 mg/L) and furfural (CV 383%) was detected. In contrast, the extract content positively influenced the balance (ρ = 0.43–0.50, p < 0.017) in all of the samples. Between the producer’s groups, the traditional samples had more unpleasant aromas due to improper distillation and fermentation, as confirmed by the chemical analysis results where ethyl acetate reached up to 5,654 mg/L. Routine sensory-chemical correlations can aid quality assessment, linking traditional heritage with modern distillation methods in Macedonian rakija production.
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    INFLUENCE OF FOLIAR FERTILIZING ON YIELD AND QUALITY OF THE TABLE GRAPE cvs. CARDINAL AND AFUS ALI
    (Ss. Cyril and Methodius University, Faculty of Agricultural Sciences and Food, Skopje, 2016)
    Poposka, Hristina
    During three consecutive years (2012-2014) an experiment has been conducted with an aim to determine the influence of the foliar fertilization on yield and quality of table grapes, cvs. Cardinal and Afus ali. The experimental site has been established in Tikvesko Vinogorje, at vineyards of AD ,,Goce Delcev,, location’s Trstenik, Kavadarci. The experiment has been conducted according the method of random block system with seven variants and three repetitions. The foliar fertilizers with different nutrient contents were applied in concentration of 0.5 %, four times during the growing period, at the stages: before and after blooming, buckshot berries and verasion. The following characteristics were investigated: content of macro and micro nutrients in leafs and shoots, yield, mechanical analyse of grape grains and chemical properties of must. On the base of the results gained, we can bring the following conclusion: foliar fertilization with a different content of macro and micro nutrients, aplicated in the same concentration and growing stages, showed biological justification in terms of increasing the content of macro and micro elements in the leaves and shoots, yield and the quality of the grape cardinal and afus ali. In both studied varieties the highest average yields has been achieved in variant 4 (Polyfeed GG 18-9-27 + 2MgO + ME). With the cultivar cardinal, the average yield is 5,23 kg/vine and 17,01 t/ha, which is significantly higher than control variant with increasing index of 25 %. The highest average yields with variety afus ali were 5,23 kg/vine and 20,66 t/ha, with a statistically significant difference from the control variant, on the level of probability P≤0,05 and P≤0,01, with increasing of 28 %. Foliar application of this fertilizer on both varieties leaded to the highest content of macro and microelements in the leaves and shoots, best grapes quality and the highest sugar content in the must.