Assessment of the dynamics of the main agrochemical indicators of irrigated chestnut soils under risk farming conditions in Stavropol

Irrigation is an important element of agricultural production in the arid conditions of the Stavropol Territory. The combination of irrigation, chemicalization and complex mechanization provides highly productive use of land that requires specific scientific support. The purpose of the research is to identify differences in the dynamics of the main agrochemical indicators (organic matter, pH, mobile phosphorus, mobile potassium) on irrigated and non-irrigated chestnut soils. The object of research is chestnut soils located in an extremely arid climatic zone of the Stavropol Territory. The data of complex monitoring of soil fertility in the Apanasenkovsky district were used as the source material. The data for the period from 1991 to 2020 were prepared by the staff of the State Center for Agrochemical Service “Stavropolsky”. The content of soil organic matter was determined by the Tyurin method in the modification of CINAO. Mobile compounds of phosphorus and potassium were determined by the Machigin method in the modification of CINAO. The value of the hydrogen pH index of the aqueous suspension was determined by the potentiometric method. The content of organic matter in chestnut soils increased from 1.8 to 2.0–2.1% both on irrigated and non-irrigated lands. A tendency to leaching of irrigated lands by 0.2 units has been revealed; therefore, in this case, it is recommended to use chemical ameliorants. Moreover, on irrigation, an increase in the content of mobile phosphorus (from 0.8 to 4.0 mg/kg) compared to non-irrigated areas was revealed. The reason for this is the increased doses of phosphorus-containing fertilizers applied during irrigation. During the study period, the content of mobile potassium increased from 77 to 93 mg/kg irrigated chestnut soils compared to non-irrigated ones. The negative dynamics in the content of mobile potassium on irrigation was revealed. It amounted to 364 mg/kg (as of 2020), which is lower than the data of the previous survey period by 81 mk/kg. Particular attention should be paid to the use of potash fertilizers since there is increased removal of this element, despite the high potash potential of chestnut soils in the arid zone of the Stavropol Territory.

Formation of technological schemes during working off steeply inclined layers

Purpose. Creation of technological schemes ofdevelopment of steeply inclined layers in the conditions of the formation of edges of deep iron ore pits during the development of deep steeply dipping deposits in order to determine the width of the working platform. The research of the methodology consists in the development of new technological schemes and the use of existing schemes for the development of benches in the conditions of steeply dipping deposits. The next step is determining the width of the working platform, depending on the layout of the main equipment and the sequence of working off the bench. At the same time, the selected equipment allows to determine the parameters of the working platform of bench. For selecting the equipment, four options of equipment were distinguished according to the averaged parameters of modern mining machines, i.e. the method of averaging indicators was used. Findings. New technological schemes have been developed, as well as existing technological schemes have been used to substantiate the width of the working platform during the formation of steeply inclined layers on the deep edges of pits during the development of deep iron ore deposits. A technique was created that allows you to preliminarily determine the width of the working platform using a nomogram that takes into account the height of the bench, one of the options of equipment that can be used in the development of the bench and the scheme of development. The originality. Graphic dependencies were established for determining the width of the steeply inclined layer. These dependencies will be used during the development of the pit edge. Based on the obtained dependencies, taking into account the formation of technological schemes, it is possible to determine in advance what the width of the bench. Also, the complex mechanization (options 1-4) and the scheme with different heights of the bench are used, which allows to determine the most promising schemes of development, and in the future the rate of change in the level of areas of the steeply inclined layer. Practical implications. The possibility was established by a graphical method to determine the optimal width of the working platform or layer on a separate horizon or within a block, using complex mechanization. The results allow to prepare data (mining flowsheet bench (s), a width platform (layer) by selecting the equipment suitable to work on the bench with the corresponding parameters) for further design of the staged development of steeply inclined layers of deep open pits.

Study of the continuous mode of mixing feed components in a mixing plant

The article discusses the problem of developing means that can increase the efficiency of mecha-nization of the process of preparing liquid feed in animal husbandry. Design bureaus, research and technological institutes for mechanization and electrification of agriculture have developed new progressive technologies, as well as kits, units, machines and apparatus for animal husbandry and fodder production. On the basis of this technique, complex mechanization of farms is being intro-duced and livestock complexes with industrial production technology are being created. But recent-ly, the widespread use of domestic machines for the preparation of liquid feed mixtures has not been presented. Therefore, an experimental setup that combines three functions: a batcher, a pump and a mixer is proposed. It ultimately allows to obtain a mixture of good quality. The article pro-vides a program and research methodology for the setup. For this, a special test bench has been de-veloped. It makes possible to determine the parameters of the mixture quality and the specific con-sumption of electrical energy. As a search for the optimal combination of factors for the optimiza-tion criteria: the degree of homogeneity and the specific consumption of electrical energy, plan 32 was chosen. Experimental studies have shown the range of supply of the installation at different speeds of rotation of the impeller shaft. Mixing studies have confirmed the effectiveness of the de-sign of the plant and its components: dispenser, pump and mixer. With the help of experimental planning methods, the main factors influencing the mixing process are identified, and the optimal parameters of the mixture quality are determined. According to the studies of the continuous intro-duction of components in an experimental setup for the preparation of liquid feed mixtures, it was obtained that the optimal combinations of factors would be the water temperature t = 26 ... 38 oC and the rotation frequency n = 1500 ... 1650 min-1, while the degree of homogeneity reaches Θ = 94,6% and unit costs of electric energy Eel = 0.198 kWh / t.d. h.

TECHNOLOGICAL METHODS OF INCREASING WEAR RESISTANCE AND DURABILITY OF DETAILS

Improving the reliability and service life of machines, components, units is an important factor in reducing the cost of restoration, downtime of equipment in repair, reducing the number of spare parts. The introduction of the latest technologies of agricultural production, as well as constant modern improvement, the complexity of agricultural machinery is a natural result of its development. Parts restoration technologies are among the most resource-saving, because compared to the manufacture of new parts costs are reduced by up to 70%. The main source of resource savings is the cost of materials. At longtime use of machines wear of details is followed by decrease in operational indicators, causes deterioration of quality of products. The tractor PTO shaft is subjected to significant static and dynamic loads. The high wear rate is due to constant friction with the grafting disc, gear, inner bearing rings. The production of a new power take-off shaft requires significant costs, so the development of new technological processes of repair and restoration is relevant. It is rational at restoration of the previous sizes and return of a detail of normal mechanical properties. The remanufactured part is consuming its life, like a new part, and may exceed the service life of the new part. With the increase in the equipment of agricultural production with more advanced equipment, the conduct of complex mechanization and increasing the efficiency of the use of equipment, repair production is developing and changing. The development of the field of restoration of worn parts is based on close cooperation of repair production with branch and basic science, and achievement of scientific and technical progress. A promising direction of restoration technology in the organizational plan is the deepening of the method of group restoration technology - the creation of a unified group equipment for the restoration of surfaces. It is established that the majority of details of the restored cars are rejected at the expense of insignificant wear of working surfaces, making no more than 1% of initial weight of details. Experiments and practice show that the repair of agricultural machinery is technically impossible to avoid. Most worn parts have a high residual value: their restoration consumes 20-30 times less metal and materials than the manufacture of new ones, which is economically feasible. Problems are considered: the choice of technological process of restoration, the choice of technological equipment, tools.

CURRENT STATE AND PROBLEMS OF DEVELOPMENT OF THE TECHNICAL BASIS OF AGRICULTURE

Agriculture is the central link in the agro-industrial complex, an important source of income and an instrument for ensuring the country's food security. In modern research works, the fundamentals of the development of the technical base of the agricultural economy sector have not been practically revealed. Issues related to the formation and functioning of the agricultural machinery market remain unresolved. In this regard, the search for solutions to the problem of complex mechanization of agriculture is becoming especially relevant in modern conditions. The scientific novelty of the work is to justify the need to improve technical equipment and practical recommendations for the development of the innovative base of agriculture. Provisions that determine the scientific novelty of the study are: to identify the main trends in the changes in the elements of the material and technical base of agriculture in the Republic of Tatarstan and to reveal the necessary modernization and innovative development of the technical base. The practical potential of the research results is to increase the economic efficiency of the technical base of agriculture in the republic. Theoretical and practical results of the study can be recommended for use in the formation of programs for the development of technical equipment of the republican agrarian sector, planning of agricultural production, economic analysis of the economic activity of agricultural enterprises and organizations. Not only the development of the agro-industrial complex as a whole, but also the improvement of the quality of life of the population and its provision with food products depend on the efficiency of using the technical base. The most important agricultural sector in our country is crop production, which produces about 60% of this type of product. The priority area for agricultural development is stable technical support for business development. The solution to this problem largely depends on the use of structural elements of the technical base, on the conditions of its operation and reproduction, on susceptibility to various innovations and on high adaptability to a changing external environment.

Features and problems of formation of the system for utilization of agricultural equipment "Agricultural recycling" in AIC

In the agro-industrial complex of Russia, the share of the main types of agricultural machinery with a service life of more than 10 years is: for tractors — 61 %, grain harvesters — 47, forage harvesters — 42 %. Due to the extremely low provision of the Russian agro-industrial complex with modern tractors, the energy supply per 100 hectares of sown area is 150 hp. with technologically required 300–350 hp. On cattle farms, the level of complex mechanization of technological processes has decreased by 23 . Within the standard period, no more than 20–25 % of technological equipment is used and only 5–8 % meet modern requirements. The problem of updating the park of domestic agricultural machinery and livestock equipment can be considered only in a single complex with the disposal of these machines and equipment.

MODELING OF POTATO MILL SEPARATION PROCESSES IN A DRUM SEPARATOR

In order to successfully enter Ukraine into the western markets, it is necessary to ensure the competitiveness of its products, which is achieved through the complex mechanization of technological processes, reduction of labor costs, increase in yield and quality of the products obtained. The most common method of mechanized harvesting of potatoes is the erosion of the tuber layer with its subsequent destruction and the separation of tubers from heap, which contains vegetable impurities, soil tubers and stones. The most difficult is the separation from the tubers of solid soil clumps and stones. Attempts have been made to overcome this problem by placing potatoes on well-sown sandy soils with the help of special agrotechnical techniques that reduce, to some extent, the number of tubers. However, such measures are local, not sufficiently reliable and significantly complicate technology. About 25% of the area occupied by potatoes is heavily clogged with stones, the size of which is close to the size of tubers, and about 40% of the planted potatoes are placed on soils prone to significant lumps. Accordingly, the purpose of the study was to conduct a comparative analysis of technologies and machines for potato harvesting, to develop a model of the process of separation of potato pile in a drum separator. The researches were carried out by technological and structural analysis of technologies and machines for potato harvesting. During the research, the methods of comparison and mathematical modeling of technological processes were used. The information base of the research was the works of Ukrainian and foreign scientists on technologies and machines for potato harvesting. On the basis of the comparative analysis of technologies and machines for potato harvesting, the main processes affecting the agrotechnical indices of the harvesting technique have been identified, a model of the process of separation of potato pile in a drum separator has been developed, which includes the following basic processes: model of sifting of a through fraction of soil from the top layer of pile; heap mixing model; model of destruction of soil lumps on the separator; model kinematic analysis of potato pile in a drum separator; model of sifting of the passable soil fraction from the bottom layer of the pile; model of damage to tubers and other structural and kinematic parameters of the working bodies of the drum separator.