Published in Scientific Papers. Series B, Horticulture, Vol. LXIII, Issue 1
Written by Valentin PANCHEV, Kalinka KOUZMOVA, Valeria IVANOVA, Nikolay PANAYOTOV
The main aim of the present study was to establish the phenological development of seedlings of the widely spread linden species in Bulgaria - Tilia plathyphyllos Scop. in dependence on the environmental conditions. The seeds on 75 and 90 days after flowering were applied for propagation. The beginning and mass appearance following phenological stage as sprouting, cotyledons, first true leaf and third true leaf were recordered. The average daily temperature and sum of rainfall during the vegetation period were calculated. The relations between phenological behaviours and investigated elements of climatic conditions were determinate. The correlations between the average daily temperature on one hand and periods between different stages of seedling development on the other hand were calculated. The regressions analysis between duration of different phenophases and average daily temperature were also done. The significance of the environmental conditions on the phenological development, especially for sprouting and appearing first true leaf was established.
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