The main component of the technology of growing agricultural crops is the use of high-quality seed material, as well as the use of biological poisons and plant growth regulators, which ensures their proper growth and development, reduces the negative impact of diseases, increases the yield of the cultivated crop and the quality of the obtained products. Therefore, the aim of our study was to analyze the influence of biological preparations Vimpel 2, Oracle multicomplex and their mixture Vimpel 2 + Oracle multicomplex on the sowing qualities the seeds of spring barley plants of varieties the Helios and Sebastian. The sowing quality of seeds spring barley was determined according to the methods prescribed by the state standard of Ukraine in the laboratory of biocontrol of agroecosystems and organic production of the Institute of Agroecology and Environmental Management of NAAN. It was found that seeds spring barley of varieties the Helios and Sebastian contaminated with micromycetes from 10 to 50% under the influence of the studied preparation, their laboratory germination and germination energy were high and ranged from 70% to 98%. At the same time, on the control version, the infection of seeds with micromycetes reached 100%, its laboratory germination and germination energy were significantly lower and amounted to 55% and 60%, respectively. According to the results of the morphometric indicators, it was shown that the sprout plants of spring barley developed more intensively under the influence of the studied preparations: their length was almost 1.5 times greater compared to the control variant. It was established that the pathogenic mycobiota of the seeds spring barley differed significantly under the influence of the biological preparations and biological features of plant varieties. The use of biological preparation the Vimpel 2 and the preparations mixture of Vimpel 2 + Oracle multicomplex significantly increases the resistance of plants spring barley to diseases and stressful situations, which, in turn, will contribute to an increase in the yield of the studied crop and the quality of its seed products. The analyzed indicators of the sowing quality of spring barley seeds make it possible to ensure sowing with high-quality seed material in order to avoid biological contamination of agrocenoses.

During 2021 on the basis of stationary field experiments, which are located in of the Skvyra Research Station of Organic Production (Kyiv region), the Nosivka selection research station (Chernihiv region), the Institute of Vegetable and Melon NAAS (Kharkiv regions) and in a private farm of organic production FOP Shanoilo (Chernihiv region) were studied of the quantitative composition of soil micromycetes under different agricultural crops: winter wheat, oats, rye, barley and onions. The research was conducted on different cultivation technologies: traditional, organic and mixed. Weather conditions during the research vegetation period differed for agrometeorological indicators. The characteristic feature was a contrast of differences in air temperature and unequal distribution of rainfall, which affected the composition of the soil mycobiocenosis. The vegetation period of 2021 in Kyiv region was characterized by sufficiently moist (HTC 1,7), and in Chernihiv and Kharkiv regions drought prevailed (HTC 0,6). Adverse weather conditions such as drought and waterlogging of the soil contributed to changes in the number of mycobiomes of the studied soils. Mycobiota are integral homeostatic components that affect what determines its important functions and the possibility of a continuous cycle substances. It is shown that cultivation technologies depending on the system of fertilizer and crop protection affect the formation of soil mycobiome. The of stationary field experiments that characterized by typical chernozem are more stable and balanced structure of soil microbiocenosis than low-fertile sod-podzolic soils, where the number of major ecological and trophic groups of micromycetes under different crops was twice as lower. It was found that each plant variety has a specific mycobiome of the rhizosphere, depending on the available soil group. It is determined that the number of major ecological and trophic groups inhabiting the rhizosphere of different crops depends from phase development of plant, soil and climatic conditions, soil type, fertilizer system and the cultivation technology and type of crops.