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Increasing the wear resistance of parts of tillage working implements and increasing their resource is an urgent problem. A decrease in the resource of tillage working implements occurs due to uneven wear of their parts and soil features. Accelerated wear of working surfaces reduces the quality of soil cultivation, increases the traction resistance of tillage machinery and thereby allows to an increase in the energy intensity of soil cultivation technology.The article presents the mathematical models developed by the authors that describe the process of interaction of the soil with the surface of parts of soil-cultivating working implements during their surfacing with hard alloys. The developed mathematical models make it possible to predict the values of traction resistance, the magnitude and rate of wear of the tillage working implements. The results of experimental studies confirm the adequacy of the developed mathematical models and indicate that the deposition of hard-facing from hard alloys of certain sizes and configurations on the working surfaces of the parts of soil-cultivating working implements ensures their wear resistance when working in an abrasive soil environment. The results of experimental studies of a plowing unit consisting of tractor MTZ-920 tractor and plow PLN-3-35 for sod-medium podzol, medium loamy (light loamy) soils on moraine loam showed that the wear resistance of the deposited share is 2.54 times higher than the wear resistance of the standard ( serial) plowshares without surfacing.

In many countries of the world with high climate humidity, grass seeds after their harvesting cannot be preserved without artificial drying. The artificial drying process is associated with high energy costs, and its regimes should not reduce the sowing quality of seeds. Therefore, it is of particular importance to determine the most suitable drying regimes for seeds. For this purpose, for the conditions of seed farms in the North-West of the Russian Federation, experimental studies were performed to obtain information on the parameters and modes of drying seeds of perennial grasses for their various initial states and conditions. Experimental studies were performed on a rotary dryer during the drying of meadow fescue seeds. The experimental data were analyzed in Microsoft Excel 2010 using the methods of mathematical statistics. The obtained mathematical dependencies made it possible to establish that the effective modes of drying the seeds of the studied culture are provided during their layer-by-layer unloading from the drying chamber. Moreover, the lower layer of seeds should be unloaded every 2.5 hours of drying, while adding to the upper layer of the drying chamber a new volume of seeds equal to the unloaded one.

The indicators of the feed output and, in general, the profitability of animal husbandry rely on the effectiveness of forage harvesters. Models depicting the performance and fuel use of forage harvesters were received resulting from the analysis of the fuctioning indicators. An effectiveness ratio was suggested for a comparative analysis of their effectiveness. It considers the relationship between performance and fuel use while harvesting grasses of different yields. Three forage harvesters: Jaguar-840, Jaguar-690 and Maral-125 are analyzed in this article when selecting grass windrows dried to a moisture content of 65%. Comparative analysis of the concerned forage harvesters revealed that the fullest loading of the Jaguar-840 and Jaguar-690 harvesters is achieved with a yield of grass more than 17.5 t/ha, and the Maral-125 combine harvester-with a yield of grass more than 10 t / ha. If the grass yield is up to 7 t / ha, the fuel rate of the harvesters is almost the same. Its changes occurs along a decreasing exponential curve with an increase in the yield of grass. The highest effectiveness ratio, equal to 33.54 (ha / shift)×(t / l), during silage preparation, has a Jaguar-840 forage harvester with a grass yield of 10.0-20.0 t / ha. The lowest effectiveness ratio is 5.63 (ha / shift)×(t / l), has Maral-125 harvester in the grass cutting with a yield of 25.0-30.0 t / ha.

05.20.01 Технологии и средства механизации сельского хозяйства (технические науки) 05.20.01 Technologies and means of mechanization of agriculture (technical sciences) ОБОСНОВАНИЕ РАЗМЕРА КОМБИНИРОВАННОГО АГРЕГАТА ДЛЯ ОБРАБОТКИ ПОЧВЫ И ПОСЕВА SUBSTANTIATION OF THE SIZE OF A COMBINED DEVICE FOR TILLAGE AND SOWING