Research was carried out to identify changes in energy costs and the stability of the optimal parameters of a trailed sprayer when changing the numerical values of factors affecting its operation, to determine the possibility of stable operation in various conditions. The work was carried out using the example of a trailed sprayer for a 4K4a tractor, type MTZ-82, with an engine power of 80 hp. (optimal working width – 32 m, speed – 10 km/h, wheel diameter – 2 m, tank volume – 5000 l, wheel profile width – 0.2 m, sprayer weight distribution coefficient on its support wheels – 0.83) at changing the following operating conditions of the unit: cultivated field area from 1 to 101 hectares, paddock length from 0.1 to 1.1 km, soil density from 1.1 to 1.7 g/cm3, tanker productivity from 100 to 700 l/min , grain yield from 15 to 70 c/ha, seasonal volume of work per unit from 100 to 3600 ha, application rate of preparations from 50 to 330 l/ha, number of weeds per unit field area from 10 to 460 pcs/ m2. With an increase in the numerical values of the first four of the listed factors that determine the operating conditions of the sprayer, the total energy costs decreased by 200...2800 MJ/ha, an increase in the values of the indicators of the other four factors of the system led to an increase in the total energy costs by 300...5300 MJ/ha. At the same time, the optimal parameters of the sprayer remained unchanged regardless of the variation in the factors under consideration.

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