An analysis of yield dynamics in Peredovik sunflower variety in the conditions of the North Caucasus Region

The results of observations for 1971–2002 were used to analyze the long-term trends yield and duration growing season in sunflower variety Peredovik. regression analysis has shown that decreases with increase sum temperatures above 15 °C. was negatively associated sums precipitation May–August, positively April. According differences, main factor influencing variability hydrothermal coefficient period 20 °C, second spring precipitation. possible presence a non-linear trend dynamics is not related weather climate conditions been revealed. With sustained tendency last 30 years towards an decrease April, will keep shortening decreasing.