The relevance of this work is to improve agronomic measures for growing winter wheat in the eastern part of the Northern Steppe in order to increase the level of crop productivity while reducing the production costs. The aim of the research was to optimize new, more advanced agronomic measures for growing winter wheat on the basis of differentiated use of mineral fertilizers, growth regulators and microbiological preparations that will ensure better adaptation of plants to arid steppe conditions and promote sustainable grain yields. The scientific novelty of the results is to establish relationships between individual agronomic measures and determine their impact on the growth and development of winter wheat plants during the growing season in order to stabilize grain production with high economic efficiency in the eastern part of the Northern Steppe. In the course of experimental studies, it was found that the biometric parameters of winter wheat plants of different breeding centers reflected their response to climate change, which occurred during the years of research. Thus, one of the important factors influencing the resistance of plants to adverse wintering conditions is the depth of the tillering node. On average, over the years of research, the depth of the tillering node in winter wheat plants of different varieties ranged from 3,0 to 3,8 cm. The largest number of nodal roots was formed by plants of the varieties Bohynia (+ 0,8 pcs. to St), Oleksiivka (+0,9 pcs. to St) and Fermers’ka (+ 1,2 pcs. to St). The lowest indicators were in the varieties Natalka (4,6 pcs./1 plant.), Pryvablyva (4,7 pcs./1 plant.), Zhuravka (4,6 pcs./1 plant.) and Zhytnytsia (4,8 pcs./1 plant). The tillering coefficient of winter wheat plants on average over the years of research varied from 2,4 to 4,0 depending on the variety. It was determined that the tillering coefficient significantly depended on the nutrition background and on the option of using the growth regulator Humisol-plus. Thus, on the background of mineral nutrition N30Р30К30 on the variants of autumn treatment of crops with Humisol-plus was used, the same tillering coefficients were obtained, which amounted to 4,8, which is 0,2 higher than the control. Variants with spring spraying of crops contributed to the formation of the highest tillering coefficients on this background of nutrition, which exceeded the control by 0,5, and variants with autumn spraying by 0,3. On the background of N20P20K20, the same pattern can be traced, but the variants with autumn spraying formed tillering coefficients, which were inferior to the control variant. The use of Humisol-plus for spring spraying crops increased the tillering rate from 0,3 to 0,4. It was found that inoculation of seeds with microbiological preparations had a positive effect not only on the formation of biometric parameters of winter wheat plants, but also improved physiological processes, such as the accumulation of chlorophyll in the leaves. Conditions of autumn vegetation of winter plants in the years of research contributed to the increase of chlorophyll content in the vegetative parts of plants. Among the options were those where the drug Melanoriz was added GumiFriend or HelpRost. Studies have shown that the yield level in the control variants, regardless of the nutrition background, was the same, i.e. not a significant difference between the doses of mineral fertilizers, on average over the years, did not increase the productivity of winter wheat plants. The introduction of Humisol-plus growth regulator into the technological process significantly increased the level of productivity and, depending on the background, provided almost the same indicators, but in different variants. Thus, the highest indicator on the background of N30P30K30 was the option where the fertilizer was applied Humisol-plus in the soil under pre-sowing cultivation (3,0 l/ha) + seed treatment (1 l/t) + 2 fertilizations in spring in the phases of tillering and stem elongation (0,5 l/ha) – 9,20 t/ha, and on the background of N20P20K20 – option where the seeds were treated Humisol-plus (1 l/t) + 2 fertilization in spring in the phases of tillering and stem elongation (0,5 l/ha) – 9,07 t/ha. Studies have shown that the use of microbiological drugs in the technology of growing winter wheat stimulates the development of plants during the growing season, and, as a consequence, increases the structure of the crop. Along with the variants where seed inoculation was used, the variants with spraying of crops also affected the length of the ear, providing an increase to the control variant by 4,1 %, due to spraying of crops in the tillering phase and 6,9 % – when spraying crops in the stem elongation phase with GumiFriend. It was found that over the years of research, the most significant increase in yield was by inoculation of seeds with Melanoriz (12,49 %, according to the control).
