TY JOUR TI TRIBOTECHNICAL PROPERTY STUDIES DISKS OF PLOUGHSHARES OF SOWING MACHINES KW operability KW sowing machines KW resource KW ploughshare discs KW tribotechnical properties KW wear KW friction coefficient JO Bulletin of Belgorod State Technological University named after. V. G. Shukhov AU Pastukhov, A.G. AU Timashov, E.P. AU Minasyan, A.G. AU Volkov, M.I. PY 2026 IS 11 PB Belgorod State Technological University named after V.G. Shukhov