The thesis theoretically summarizes the developments on the task set for the study and proposes a scientifically grounded development of the influence of methods of applying the growth regulator Vermiodis at different seeding rates of winter rape seeds on the formation of productivity in the conditions of the Western Forest-Steppe. The introduction reflects the relevance of the topic, the connection of the work with scientific programs, the purpose and objectives of the research, the object, subject, research methods, and the working hypothesis formed on their basis. The scientific novelty and practical significance of the results are highlighted, In the first chapter of the qualification work "State and directions of scientific research on the influence of elements of cultivation technology on the formation of winter rape productivity" (review of scientific literature), an analytical review of literary sources of domestic and foreign authors on the state and prospects of rape production, the use of plant growth and development regulators and the use of optimal seeding rates in agrotechnologies for growing winter rape was carried out. Attention is focused on insufficiently studied issues that require research in the Western Forest-Steppe zone. The second section "Conditions, material and methods of research" presents the soil and climatic conditions of the research site, the experimental scheme andthe main methods of scientific work. The characteristics of the studied variety, hybrid and growth regulator are given. In the third chapter "Peculiarities of growth and development of winter rape plants in the autumn growing season, depending on the methods of application of growth regulators and seeding rates" it was investigated that the use of Vermiyodis growth regulator in the technologies of winter rape cultivation in pre-sowing seed treatment and one- and two-time spraying of plants during the growing season, at the established optimal seeding rates, contributed to the activation of plant growth and development, increase in yield and improvement of seed quality. Laboratory studies have established that the use of Vermiodis at a dose of 5 l/t increased the germination energy of winter rape seeds of the Mercedes hybrid by 4.5%, Cheremosh by 4.1% and provided a higher percentage of laboratory germination of seeds, respectively, by 2.7% and 2.6%. It was found that the highest field germination rate of 89.6-90.0%, which is 4.6-5.0% more than the control,was in the variant where pre-sowing treatment of winter rape seeds of Cheremosh variety with a growth regulator was carried out at a seeding rate of 0.8 million seed units/ha. In the Mercedes hybrid, the highest rates were observed at a sowing rate of 0.6 million seed units/ha and amounted to 89.5-90.4%, which is 5.6-6.5% more than the control. In these variants, the height of plants of the Cheremosh variety at the time of termination of the autumn vegetation was 28.3-28.5 cm (3.4-3.6 cm more); the length of the root system was 14.1-14.2 cm (+3.6-3.7 cm); the air-dry weight of plants was 20.0-20.3 g (+7.2-7.4 g); the height of the root neck above thesoil level was 2.3-2.4 cm (0.2-0.1 cm less) compared to the control. In the Mercedes hybrid, the height of plants was 26.1-26.7 cm (3.5-4.5 cm more), the length of the root collar was 13.4-13.7 cm (+3.4-3.7 cm), the height of the root collar above the soil level was 2.2-2.3 cm (0.1-0.2 cm less) compared to the control. During the pre-sowing treatment of winter rape seeds with Vermiodis
regulator, increased resistance of plants to overwintering was established. In the Cheremosh variety at a sowing rate of 0.8 million seed units/ha, plant mortalityduring this period was 4.6-5.6% (4.7-3.6% less), in the Mercedes hybrid at a sowing rate of 0.6 million seed units/ha - 4.3-5.2% (4.3-5.0% less). In the fourth chapter "Influence of growth regulator and sowing rates on the growth and development of winter rape plants in the spring-summer growing season" it was determined that the use of the growth regulator Vermiodis, especially in the variant of pre-sowing treatment and double spraying, provided an extension of the growing season of winter rape by 1-5 days. The longest vegetation period of Cheremosh variety lasted 311 days (+5 days) at a sowing rate of 0.8 million seed units/ha, and of Mercedes hybrid - 315 days (+4 days) at a sowing rate of 0.6 million seed units/ha.The best indicators of photosynthetic activity were found when using the growth regulator Vermiyodis in the variant of pre-sowing seed treatment and double spraying of plants with it during the growing season at the seeding rate of Cheremosh variety 0.8 and hybrid Mercedes 0.6 million sche.n./ha: in the flowering phase, the largest leaf area of winter rape variety Cheremosh was 43.9 thousand m2/ha, which is 9.4 thousand m2/ha more than in the control; hybrid Mercedes - 43.7 thousand m2/ha, or +7.0 thousand m2/ha.
