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The research was conducted in the Republic of Sakha (Yakutia) from 2015 to 2020. Cryogenic-taiga-leached soils with low humus content are common in Central Yakutia. The use of biological products of associative bacteria is an environmentally friendly way to increase crop yields and improve soil fertility. The effect of pre-sowing inoculation of oat seeds with various biological preparations of associative bacteria: Mizorin, Agrophile, Rizoagrin, Mobilin, Flavobacterin was studied.As a control, a variant without inoculation was investigated. The responsiveness of the culture to the use of biological preparations was noted: inoculation of seeds contributed to the formation of oat grain yield. In the experimental variants, a significant increase in the yield of oat grain was noted — up to 2 t/ha in the variant with the use of the preparation mobilin. Inoculation of oat seeds by strains of associative bacteria affected the biochemical composition of oats. The largest number of grains was formed in the mobilin variant – 58 pcs., in the control variant – 51 pcs. In comparison with the variant without inoculation, the humus content in the arable layer of cryogenic-taiga-leached soil in the variant with mizorin is 3.20%, and with the Yakut strain No. 1 - 3.00% (in the control variant – 2.87%). Thus, the use of the studied biological products based on strains of associative bacteria had a positive effect on both the growth and development of plants and the yield of oat grain.

Technical condition surveys of a number of multi-purpose industrial facilities have shown that the hydrological conditions of the occupied sites often change in the course of operation. This is especially often observed in oil refining and petrochemical industries, the distinguishing feature of which is high water consumption for cleaning the machines and for general cleaning; with a low culture of the facility operation, water often flows out of the main water conduits, and when the drainage systems are disturbed, basement soils are steeped and plant territories are watered. This was observed even at sites where, at the time of the construction of the facility, the groundwater was buried deep enough and did not affect the surveyed building. Monitoring one of the processing plants made it possible to identify the source of flooding and investigate the nature of the change in the groundwater surface after long-term operation of the facility. The results of this work are given in this article.

In Russia most of the thermal units in petrochemistry are still being built with the use of piece ceramic refractories. Analysis of causes of frequent destruction of thermal units lining operated in contact with a carbon-containing medium indicates a corrosive process leading to the failure of the liner material due to the formation of soot carbon by the Bell reaction. Even high-alumina cements used for synthesizing heat-resistant dry mixtures intended to work in contact with a carbon-containing medium should not contain more than 0.1% each of Fe2O3 and SiO2 oxides.