Published in Scientific Papers. Series A. Agronomy, Vol. LXVI, Issue 2
Written by Atanas SEVOV, Veska GEORGIEVA
Climatic changes in recent years have adversely affected the development of a number of crops. Especially the spring ones suffer, since the development phases in which the yield is formed take place during the periods most strongly influenced by climate change. In the present study, the different climate components during the period 1991-2020 that most strongly influence sunflower development are characterized. It was established that the unfavorable trends of changes in agrometeorological conditions in the studied area are related to a decrease in summer precipitation and an increase in temperatures during the same period. As a result, the last two months of the sunflower growing season are in a moisture deficit. Temperatures in the region during the studied period have increased, with positive deviations in all months, except for December. No differences were recorded in the dates of the transition of the air temperature through 5oC. During the researched period, they increased by 167oC compared to the previous one. During the studied period, precipitation in summer decreased at the expense of its increase in autumn, compared to the previous one.
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