PRODUCTIVITY OF WINTER WHEAT VARIETIES DEPENDING ON TERMS OF SOWING IN THE CONDITIONS OF NORTHERN PART OF THE LEFT BANK STEPPE OF UKRAINE

Abstract

Thus, the optimal conditions for the northern part of the Left Bank steppe of Ukraine sowing dates should be considered 10-th – 20-th of September. For most varieties sowing on September the 20-th contributed to greater performance of their genetic potential in terms of productivity. The stated regularity of productivity loss have been stated at a deviation from the optimum sowing time to earlier (September the 10-th) and later (1-st and 10-th of October). Sowing in the later periods in most years leads to greater yield reduction than at early sowing.