Abstract

Assessment of agrometeorological conditions in South Bulgaria agricultural lands is more complicated because they are located in different climatic zones. From this point of view the observed tendencies of changes in this region are various, too. During the last few decades, in many stations in South Bulgaria there is a statistically significant tendency of increasing the average annual air temperature. Regarding precipitation, it is observed an increase with more than 10%, especially in the autumn-winter period and not during active vegetation season. In this case, hot summer and insufficient precipitation during the critical periods of spring crops development require contemporary assessment of agro-climatic conditions in the area. The purpose of the present study is to assess the conditions for cultivation of spring and second crops in Southern Bulgaria. For this aim are used follow basic indices - De Martonne aridity index (JDM); Selyaninov’s hydro-thermal coefficient (HTC); Balance of atmospheric humidification (BAH); beginning, end and duration of the growing season. Statistically significant trends of change have been identified. The researches cover the period 1961-2015. The results will be used for microclimatic zoning of conditions for growing of spring crops.

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