Influence of hydrothermic support of vegetation period for yield of fast-ripening soybean in southern forest-steppe of the Omsk region

Soybean productivity depends much on weather conditions. In our researches the connection of the yield with indices of hydrothermic support of vegetation period had in general curvilinear orientation of different intensity against the analyzed time period. Soybean is relatively tolerant to the size of HTC (hydrotehermic coefficient) at the beginning and the end of its cultivation (June, September). The biggest influence on realization of the potential of fastripening varieties was made by weather conditions in July-August - during the period of the intensive formation of generative organs. The strong correlation was revealed between soybean yield and number of days since September 1st until first frosts r=0.85.