The article discusses the state influence on the development of digital economy of rational nature use in the agro-sector of the region's economy. The indicated sector of the region's economy demonstrates a mismatch between the tasks of the agroindustrial complex restructuring and the current market conditions oriented towards the widespread use of the digital economy elements, introduction of technological innovations and modernization of agricultural production. The modern way trends of the socio-economic system development dictate the need to use a development model that does not cause harm to nature or minimizes it. Realization of this statement can be ensured with a harmonious combination of environmental, innovative and economic components aimed at a balanced nature management. The authors assert that digital transformation of the agricultural sector should be considered as the basis of food security and the maximum production intensification. The key state program aimed at a direct impact implementation on environmental management in the agricultural sector of the region's economy through the digital economy has been analyzed. The conclusion is drawn on the application of this program at the regional level, as well as on a particular example of the experience of the state introducing modern management methods which have a synergistic effect for the real sector of the regional economy. The article presents some particular recommendations that should be paid attention while implementing the elements of the digital economy on the processes of environmental management in the agricultural sector of the region's economy.

In this, work some aspects of the development of the visual system of Nothobranchius guentheri at the main stages of ontogenesis were described for the first time. It was possible to establish that the formation of the visual system occurs similarly to other representatives of the order Cyprinodontiformes, but significantly differs in terms of the individual stages of embryogenesis due to the presence of diapause. In the postembryonic period, there is a further increase in the size of the fish’s eyes and head, to the proportions characteristic of adult fish. The histological structure of the eye in adult N. guentheri practically does not differ from most teleost fish living in the same environmental conditions. The study of the structure of the retina showed the heterogeneity of the thickness of the temporal and nasal areas, which indicates the predominant role of peripheral vision. Morphoanatomical measurements of the body and eyes of N. guentheri showed that their correlation was conservative. This indicates an important role of the visual system for the survival of fish in natural conditions, both for the young and adults. In individuals of the older age group, a decrease in the amount of sodium (Na) and an increase in magnesium (Mg) and calcium (Ca) were found in the eye lens. Such changes in the elemental composition of the lens can be a sign of the initial stage of cataractogenesis and disturbances in the metabolism of lens fibers as a result of aging. This allows us to propose N. guentheri as a model for studying the structure, formation, and aging of the visual and nervous systems.

In the present work, an attempt was made to determine the dynamics of the content of gross forms of heavy metals in long (50 years) field experiments of various agroecosystems on various fertilizer backgrounds. In the ecosystem of the field five-field grain-crop crop rotation, the dynamics of the content of heavy metals was more clearly expressed due to their higher removal due to a higher yield of crops entering the crop rotation, as well as more significant inflows of heavy metals to the soil with mineral fertilizers and manure at a dose of 20 tons / ha per rotation sowing volume. The main sources of heavy metals in the soil are the mineral and especially organic fertilizers. Introduction of mineral and organic fertilizers, even in moderate doses for 10 rotations has contributed to the content of heavy metals in the ploughed layer typical black earth and resulted in exceeding the concentrations of individual elements (Pb, Cd ), having high background values.

Calculated and experimental studies of thermal processes and the efficiency of heat storage of solid thermal storage materials in an electric thermal storage (ETS) were carried out. Changes in the thermo physical properties of selected thermal storage materials depending on temperature are analyzed. The specific heat storage capacity in the temperature range from 50 °C to 650 °C of such materials as magnesite, chamotte, dinas, corundum was estimated. The research was carried out on an electric thermal storage with an electric power of 2.4 kW with heat storage elements made of magnesite. The temperature distribution is obtained in the heat storage element, as well as in the wall of the air channels of the heat storage elements. Measurements of the temperature of the heated air in the channels of heat storage elements and at the exit from the ETS were carried out. Temperature measurements were carried out with chromel-alumel thermocouples in a ceramic shell and chromel-kopel in a heat-resistant fabric cover. As a result of experimental studies, the temperature distribution in the heat storage elements of ETS is obtained. Based on these data it was calculated the amount of stored heat by heat storage elements of ETS for the complete cycle of its operation.

The paper presents the results of the study on the cultivation of lettuce (lactuca sativa kucheryavec odesskiy) in an aquaponics installation using soil in the conditions of closed water supply systems installations developed on the basis of the Russian-Scandinavian aquaculture center of the BiRH Institute of K. G. Razumovsky Moscow State University of Technologies and Management, Moscow. As a result of which, growth and productivity indicators of lettuce in an aquaponics installation were obtained. Hydrochemical studies made it possible to determine the efficiency of consumption of nitrates and phosphates at the maximum plant phytomass and to calculate the optimal power of the hydroponic installation for a given volume of fish tanks.

The article is devoted to the effective mode selection for vacuum honey drying. There were studied an impact of the drying layer thickness and heat flux density on the efficiency of vacuum honey dehydration. Experiments on vacuum drying of honey were carried out at a heat flux density from 2 to 10 kW/m 2 . The dependences of the relative product mass on the vacuum drying process duration were obtained. If a heat flux density increases, the drying time reduces: when a heat flux density was 2, 4 and 6 kW/m 2 , the drying time lasted for 270±10, 240±10 and 225±10 min respectively; while at a heat flux density of 8 and 10 kW/m 2 , the time was 210±10 and 195±10 min, respectively. At the same time, the moisture content of the dehydrated product also changes: an increase in the heat flux density from 2 to 10 kW/m 2 leads to the moisture content changes from 4.5 to 5 %. Experimental studies were carried out on vacuum honey drying at a product layer thickness of 5 to 20 mm. It was established that an increase in the layer thickness entails an increase in the drying time, an increase in the moisture content of the dehydrated product, and a decrease in its quality. However, this increases the productivity of the drying unit. Based on the studies, the following effective modes of vacuum honey drying were determinedheat flux density -4 kW/m 2 , product layer thickness -15 mm. It is advisable to dehydrate honey at a residual pressure of 4±0.5 kPa and at a temperature of 40 °C in the drying chamber. Under these conditions, the drying time is 275±10 minutes, and the organoleptic evaluation of the dry product is 34 points out of 40.

The relative advantages of the tools for the environmental protection have been assessed in the article. From the economical point of view emission taxes, subsidies for abatement of emissions, and market-based permit system are more preferable in comparison with the control and management systems. The control of emissions for each organization can be achieved only in case when the marginal costs of abatement for each pollutant are known, which is unlikely in practice. In case of immiscible pollution, the determination of the marginal costs of organizations to control emissions is not required only for permitting schemes, which gives them an advantage over other tools. The least expensive for achieving a particular purpose in the fight against pollution is the tool of minimum technological requirements for the protection of the environment. The long-term effect of the instrument depends on the net income effect and the effect of technological innovation. Subsidy schemes or alternative methods of initial distribution of market permits at the expense of positive effects of income can increase the size of the industry, which is undesirable from the ecological point of view. In order to neutralize this effect, the organizations of the subsidized industry may be obliged to make one-time payments, the amount of which is the total cost of subsidies. The second way is the induced impact on the pace of technological innovation. Control and management tools have weak incentives for innovation. An emissions tax (or emission control subsidy) will encourage environmentally sound innovation. In the market scheme, emission reductions reduce taxes. Pollution control instruments have different consequences for the distribution of income in the economy and the competitiveness of the economy.

Enrichment of food products with proteins, minerals and dietary fiber is possible by introducing grinding products of some cereal crops into wheat flour, i.e. obtaining composite flour mixtures. To date, there is a need to enrich food products with essential fatty acids, especially Linolenic acid (w-3), the deficiency of which leads to serious disruptions in functioning of the human body. Analysis of the lipid composition of various oilseed crops shows that the composition of flaxseed oil as a source of w-3 demonstrates an absolute advantage. The solution to the problem of flour enrichment with essential fatty acids is currently being solved by using crushed flaxseed cake. However, the use of flaxseed cake has several disadvantages. First of all, as studies have shown, the amount of such flaxseed flour in the composition of the composite mixture should be 15-20% to ensure the required amount in essential fatty acids, which significantly impairs the consumer properties of bread. The use of flax seeds directly will significantly reduce their proportion in the composition of the composite mixture.