THE INFLUENCE OF CLIMATIC FACTORS ON THE VARIABILITY OF SUNFLOWER AGRONOMIC CHARACTERS IN AZOV OF ROSTOV REGION
A comparative analysis of indicators of daily average temperatures and rainfall were conducted in the area of the Azov of Rostov Region from January 2004 to September 2011. The warming trend at the 2С and a decrease in rainfall is installed. The optimal values of the hydrothermal coefficient (HTC) were determined. Sunflower reaches maximum performance and yield plant height at a value of HTC 0.8. Sunflower yield decreases at higher HTC. This is due to the development of diseases, which at high soil humidity and high temperature can significantly reduce the yield of this crop. Selective forms of sunflower are reaching maximum of crop and hight in that conditions. Oilseeds, despite the range of average HTC during the vegetation period is stable.