%0 Journal Article %T ESTIMATION OF OPERATING COSTS WHEN USING A COMBINED IRRIGATION SYSTEM %A Travkin, V.S. %A Mischenko, N.A. %A Evseev, E.Y. %A Travkina, A.R. %K irrigation, sprinkler irrigation, center-pivot irrigation machine, combined irrigation system, land utilization coefficient, operating costs, direct operating costs %J MOSCOW ECONOMIC JOURNAL %D 2026 %N 11 %P 17 %I Electronic science