Published in Scientific Papers. Series A. Agronomy, Vol. LXVII, Issue 1
Written by Veska GEORGIEVA, Valentin KAZANDJIEV, Stoyan GEORGIEV, Stephan RASHEV, Daniela VALKOVA, Gallina MIHOVA, Dragomr VALCHEV, Vesselina DOBREVA
Assessment of agro-climatic resources of the agricultural regions relates to the biological requirements of the crops and the applied agricultural techniques. Agro meteorological conditions determine 65-80% of the potential productivity of agricultural crops. In the years after 2000, unfavorable tendencies in the values of meteorological elements, as well as an increase in the frequency of extreme weather events, are a fact. These features of the weather create risky conditions for the cultivation of sunflower in some areas of traditional producers of this crop. The aim of this study is the assessment of the agro-climatic conditions for the cultivation of sunflower in Bulgaria. A comparative analysis and evaluation of the agro-climatic conditions for growing sunflowers in three locations - Chirpan, Karnobat and G. Toshevo and their influence on the growth, development and productivity of sunflowers was made. The experimental fields are located in two climatic sub-regions of the European-continental climatic region - moderately continental (G. Toshevo) and transitionally continental (Chirpan and Karnobat) regions. The new climatic norms of the meteorological elements for the period 1991-2020 were used in the comparative analysis.
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