Better fi eld operations are performed result in lower weed contamination of crops, which means less chemical protection is required. This makes a positive eff ect on soil fertility, crop quality and the ecological situation in general. (Research purpose) To study weed circulation in mechanized farm technologies for cereal production and propose ways of reducing the weed content at all stages of cultivation, taking into account the favorable environmental response of the agricultural background. (Materials and methods) The authors have revealed the fundamental criteria for the implementation of fi eld operations based on a multifactorial model of crop cultivation: reduction of the weed content, reduction of soil compaction sites and re-processing, and environmenta response. They have demonstrated weed circulation in traditional cereal production technologies, identifi ed the development dynamics of weeds and their distribution in the agricultural background. (Results and discussion) The authors controlled weed seeds on spring wheat fi elds under production conditions during the harvest seasons of 2016 and 2017. They experimentally found an increased content of miliary weed seeds in the selected threshing products, the mass of which ranged from 5 to 16 grams per m2. The share of weed seeds in grain hopper amounted to 2.9 percent. It was revealed that weed seeds isolated by a combine remain viable after autumn tillage. Transverse tillage increases the area of contamination in 2 times or more. The authors propose a comprehensive system of weed control at all stages of fi eld operations, taking into account the environmental response of the agricultural background. It is shown that the separation and destruction of weed seeds at the harvest stage is of particular importance. The authors present technical and technological solutions to reduce weeds and ensure a favorable ecological situation. (Conclusions) The authors have designed a comprehensive system to reduce weed contamination, thus reducing the overall impact of plant protection remedies by 30 percent.

A significant proportion of the costs and downtime for repairs are on transmission units, and especially on the gearbox (GB). Based on the research results presented in the work, up to 76% of all transmission failures fall on the gearbox of a KamAZ 6540 automobile under ordinary operating conditions. The purpose of the study is to justify the repair and maintenance cycle (RMC) of the gearbox of the KamAZ 6540 automobile, taking into account the pre-repair operating time. The proposed methodology for assessing the pre-repair resource allows you to select the resource elements of the gearbox, taking into account the value of their resource and coefficient of variation. The structure of the RMC proposed in the work provides for: the first current repair during running hours - 125940 km; first overhaul during running hours - 251880 km; second current repair during running hours - 377820 km; second overhaul during running hours - 503760 km. Thus, changing the structure of the gearbox REC allows increasing the gearbox resource from 380 to 500 thousand km.

Thermal recycling and disinfection of waste products in different physical states represent a comprehensive solution to the problem of waste utilization. The utilization of waste materials with high moisture content (more 70…75%) is associated with a need to evaporate a significant volume of water and causes, as a consequence, substantial additional expenses on an energy source. To cut costs related to the utilization of wastes with a high amount of water it is suggested using a coal cleaning product – a coal-water slurry fuel. The direct combustion of incompletely mechanically dehydrated (to 70-75%) wastes with high water content (cake) is an economically efficient process. However, it poses a severe problem of combustion stabilizing. The paper presents outcomes of the research into the stabilization of thermal recycling waste materials with a high level of moisture by means of low-temperature plasma in the adiabatic vortex combustion chamber. To control a burning process in the technology adapter low-temperature plasma is supplied into the base of flame. An output of a plasma generator (power supply source) is estimated as 1 kW power input per 13 kg/h suspension fuel. A dynamic range of heat output for a coal-water slurry fuel and wastes is determined to be 70-100% when generating thermal energy and utilizing wastes with high moisture content by means of low-temperature plasma as a stabilizer of a combustion process. Experimental studies carried out on a machine simulator have proven the efficiency of low-temperature plasma for utilization and disinfection of waste products in commercial farming.

An estimation of the possibility of dehydration of sludge-lignin of the Baikal Pulp and Paper Mill by the freeze-thaw method was carried out. Change of sludge-lignin structure, physicochemical properties and chemical composition after freeze-thaw are shown. Toxicity and chemical composition of the water solution separated from the sludge-lignin during its freeze-thaw is estimated. An increase in the rate of germination of seeds of the cress in the soil with the addition of the frozen-out sludge-lignin in the ratio "sludge-lignin-soil" 1:3-1:4 is shown. Possibility of application and recommendations for the use of freezed out sludge-lignin as an organic fertilizer is considered. Principal possibility of the worm transformation of sludge-lignin, previously dehydrated by the freeze-thaw method, by red Californian worms Eisenia foetida Andrei Bouche (1972) is shown. The issue of prospects for processing this waste in a fertile bio-soil is discussed. The latter can later be used for recultivation of the territory of the sludge accumulator plots of the Baikal Pulp and Paper Mill.

In blast furnace production special refractory compounds are used for sealing of the tap holes and protection of the runners from molten metal and slag,In modern blast furnace d~partments special areas have been developed for the production of these compounds, To evaluate the contamination of the air space in the p~oduction of refractory compounds for the blast furnaces the quantity and composition of harmful substances in two metallurgical combines (I and II) were determined. Table 1 gives the compositions of the prepared compounds, A total of nine compounds were prepared, all of them contained coke and clay, and seven also contained high-temperature pitch.The components other than coke are supplied to the refractory compound area ready for use while the coke was first ground in roll crushers, For the wet compounds moist coke is used and for the dry ones dry.The components are added by the volume method and mixed in mills with water or in heated mixers with pitch.The weight of the powder components is primarily 900-1000 kg and for the tap hole mixture with water in combine I 600-620 kg, The plan of preparation of the compounds is shown in FSg. i.The difference in aggregate forming of the production plan in the combines is that in combine I the dry components are mixed in the mills 7 and the prepared mixture is loaded into the mixture 8. In combine II the components are delivered directly to the mixer 6.The main quantity of the refractory compounds prepared in combine I is normal runner and dry tap hole and in combine II runner and dry tap hole i~ *Deceased.