ISSN 2285-5785, ISSN CD-ROM 2285-5793, ISSN ONLINE 2285-5807, ISSN-L 2285-5785


Published in Scientific Papers. Series A. Agonomy., Vol. LVI
Written by Veska GEORGIEVA, Valentin KAZANDJIEV

During the last decade climate variability and anomalies become more evident and their impact is more expressive.Appearances are different - sudden changes in weather conditions transitional seasons are becoming shorter with fuzzyborders, dry spells and droughts in combination with forest and field fires. Simultaneously, there are torrential rainsaccompanied by devastating floods that caused significant damage to agriculture. These anomalies affect on theconditions for grow of crops because 90% of the yields depend from weather conditions. The winter wheat has a longvegetation period. Development of wheat crops depends of different combinations from state of basic meteorologicalelements.Main purpose of this paper is to assess the agro-climatic conditions in major grain producing regions of Bulgaria tothe use of agroclimatic potential of each. This investigation covers the period 1981-2010, and refers to occupiedterritories with winter wheat and barley. Data were analyzed for fundamental values of weather elements - maximum,minimum and average daily air temperature (°C), rainfall sum (mm). An assessment of agro-meteorological conditionsduring critical phases of crop values on the main weather elements - sowing winter conditions, water saving, tillering,stem elongation, earing and milk ripening. It is traced as the dynamics of the main meteorological elements and theircomplex effects on growth and development of crops from the calculation of some indices characterizing hydrothermalconditions.

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