Published in Scientific Papers. Series B, Horticulture, Vol. LXVIII, Issue 1
Written by Boryana STEFANOVA, Petko MINKOV, Georgi POPSKI, Teodora MIHOVA
For the period 2019-2022, the phenological manifestations were studied of the Serbian plum cultivars such as 'Čačanska rana’, 'Čačanska najbolja’, 'Čačanska lepotica’, 'Čačanska rodna’, and 'Valjevka’ and their response to climatic factors such as temperature, rainfall, relative air humidity in RIMSA-Troyan. The trees are grown on light gray forest soil, under non-irrigated conditions, with tillage between the inter-row spacing. The phenophases were studied, such as the beginning of flowering, end of flowering, and fruit ripening periods. The earliest flowering began in 2019 for 'Čačanska rodna’ cultivar (28.03.), and the latest flowering began on 6.04.2019 for 'Kyustendilska plum’. In the following years, spring temperatures delayed the vegetation onset and the beginning of flowering was around 07.04 for 'Čačanska lepotica’, followed by 'Čačanska rodna’ (10.04.) and 'Čačanska najbolja’ (12.04). The latest end of flowering was reported on 7-8 May 2022 ('Valjevka’ and 'Kyustendilska plum’). For the entire study period, the phase from flowering to harvest maturity was shortened. To obtain favorable conditions for growth and fruit-bearing in the Central Balkan Mountain region, the introduced Serbian cultivars require changes in cultivation technology and adaptation to changes in the global climate.
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