TY JOUR TI ECONOMIC EFFICIENCY OF USING AN ADVANCED CIRCULAR SPRINKLER ON SLOPES KW wide-range sprinkler machine "Kuban-LK1" KW sloping lands KW surface runoff KW traction properties KW sliding propellers KW productivity KW modernization KW flow control device KW rod divider KW drainage irrigation KW rain intensity KW bearing capacity of the soil KW economic effect KW payback period JO MOSCOW ECONOMIC JOURNAL AU Ryazantsev, A.I. AU Evseev, E.Y. AU Turapin, S.S. AU Kostovarova, I.A. AU Shlenov, S.L. AU Travkin, V.S. PY 2025 IS 10 PB Electronic science