Rop R. Optimization of technological elements of winter rape seeds cultivation in Western Forest Steppe area of Ukraine

The thesis represents the results of studies, which were conducted in the Western Forest Steppe of Ukraine, regarding the lows of productive properties formation and sowing qualities of winter rape sorts which have different geographical origin and ecotype in conditions of different levels of mineral nutrition of plants, seeding rates of seeds, the usage of growth regulators in the pre-treatment of seeds and root feeding fertilization of plants and protection of root collar plant from freezing. It was found out that the soil-climatic conditions of the zone on gray forest soils, partically gleyed, high potential of winter rape seed production (3.5-4.0 t ha-1) can be realized on the basis of optimized elements of growth technology, which includes: high-productive sorts of Cheremosh, Senator Ljuks, Chempion of Ukraine, level of mineral nutrition of plant N120P135K240, quota of seeds sowing 1.0-1.3 million similar seeds per ha, pre-sowing seed treatment by protectant Vitavaks 200 FF, 34 % v.s.k. (2.5 l t-1) with growth controller Vimpel-K (500 g t-1) and autumn foliar application in the phase of power socket 5-6 pieces of Vympel (1000 g ha-1), agro-technical protection of plants in seeds crops from freezing. It was defined the effect of studied elements of technology on the germination of seeds, the accumulation of sugars, winter persistence of plants, indicator of crops structure elements, persistence to diseases, percentage of reproduction and exit of certified seeds, weight of 1000 seeds energy of germination and their laboratory similarity.