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The aim of this study was to compare newly released June-bearing strawberry cultivars ('Quicky', 'Sandra', 'Lofty', 'Nadja' and 'Aprica') in terms of their phenology, vegetative growth, productivity and fruit quality to identify their potential for wider cultivation. A field study was conducted in a strawberry plantation established in July 2020 in double rows on beds covered with black polyethylene foil (Šid, Serbia). The cultivars were evaluated in 2021-2022 for their flowering and ripening time, productivity, plant growth, biometrical and nutritional fruit traits (soluble solids content-SSC, total acids-TAs, vitamin C, total anthocyanins-TACY, total phenolics-TPC and total antioxidant capacity-TAC). The cultivar 'Quicky' started to ripen earliest, while 'Aprica' was the latest in both experimental years. The number of branch crowns per plant was significantly higher in 'Sandra' and 'Lofty', whereby 'Sandra' had also the highest number of leaves per rosette (41.5) in comparison with the other tested cultivars. The cultivar 'Aprica' was superior in terms of productivity (1061 g/plant and 4.67 kg/m 2), fruit weight (29.9 g) and fruit shape index (1.15). Contrary to this, 'Nadja' was the least productive cultivar (608 g/plant and 2.68 kg/m 2). The cultivars 'Lofty' and 'Sandra' showed the highest SSC values and were also characterized by a considerably high level of TPC (1.29 mg GAE eq g-1 FW) and TACY (24.4 mg pg-3-g eq 100 g-1 FW), respectively. Variability among the tested cultivars could serve as an important criterion for the selection of new high-performing cultivars for a given growing region.

The objective of this study was to determine and compare the content of total anthocyanins (TACY), total phenolics (TPC) and total antioxidant activity (TAA) of the fruit of 'Bluecrop' highbush blueberry grown under different nutrient management practices in a soilless production system. A field study was carried out in a highbush blueberry plantation situated near Belgrade (Serbia), during the period of 2016-2017. The orchard was planted in the spring of 2016 in 50 l polypropylene pots with 5-year-old nursery plants. Each pot was filled with the mix of pine sawdust (60%), white peat (30%) and perlite (10%), and placed at a distance of 0.8 m within the row and 3.0 m between the rows (4,170 bushes ha-1 ). The following fertilizer treatments were evaluated: 1. organic fertilizers (Org); 2. mineral fertilizers (Min) and 3. a combination of organic and mineral fertilizers (Org-Min). Soluble NPK fertilizers were applied with irrigation water, whereas granulated mineral and pelleted organic fertilizers were mixed with the substrate. Fruit samples were collected in triplicate at the beginning of ripening, full maturity and the end of the harvest season. No significant effect of harvest time on each of the tested parameters was observed, whereas the content of TACY did not even differ under various fertilizer treatments. TPC in the fruit significantly increased in Org and Org-Min treatments (139.8 and 139.3 mg eq GA 100 g-1 FW, respectively) compared to Min treatment (122.7 mg eq GA 100 g-1 FW), while a considerably high TAA level was found only in berries under Org-Min treatment (0.53 mg asc g-1 FW).