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The article analyzes the peculiarities of export activities of small and medium-sized businesses, shows the high involvement of companies belonging to small and medium-sized businesses (SMEs) in the high-tech sector. The contribution of SMEs to the creation of the value of a product/service through the introduction of innovations and their adaptation to different contexts by providing new or niche products that meet the diverse needs of customers is noted. Based on the analysis of the world practice of export activities of SMEs, the author concludes that SMEs can contribute to economic diversification and economic sustainability. This is especially true for resource-rich countries that are particularly sensitive to fluctuations in raw material prices. The emphasis is placed on the analysis of the export activity of Russian SMEs, an insignificant share of SMEs in the total volume of exports in comparison with other countries is highlighted. It is concluded that Russian small and medium-sized businesses are in the process of formation, which makes them vulnerable to the influence of both external and internal threats. It is shown what impact the COVID-19 pandemic had on SMEs. It was emphasized that the main problems for such companies were non-fulfillment of contractual obligations and a sharp decline in demand.

The purpose of fundamental research in agricultural ecology is to solve complex problem of the establishment of patterns of mass transfer in agricultural systems and regulation of these processes in agricultural soil use. The chemical composition of soil is the result of soil-forming processes. The characteristics of the soil-forming material play decisive role. The investigation of the content of macro- and microelements in soils of different types has been quite relevant in recent decades due to their large physiological role in the life of plants and animals and the active transformation of soils during agricultural use. Fertilization is a process of certain soil cultivation and includes a set of measures aimed at the regulation of macro- and microelements, the lack of which can be determined by zonal conditions of soil formation or soil degradation, as a result of irrational agricultural nature management. The paper presents the results of a study of the content of individual macro- and microelements in some types of soils of the Central Black Soil regions. The studies of the aspects of the impact of fertilization existing in the scientific literature are controversial. The consideration of ecologically and economically justified levels of changes in soil properties during cultivation is necessary to control negative transformations of chemical elements in soil and their accumulation in depositing media. A quantitative assessment of the total content of water-soluble salts, their qualitative composition and dynamics under the influence of agrotechnical factors, the study of their spatial differentiation in soil cover allows optimizing the use of fertilizers and increasing the stability of agropedocenoses.