TY JOUR TI RESULTS OF EXPERIMENTAL STUDIES USING PIERCER-MILLING CHISEL PLOUGH KW tractor KW k-700a KW pm6x4p KW slitting KW soil preparation KW load KW piercer-milling chisel plough KW piercing depth JO Vestnik of Omsk SAU AU SHCHITOV, S.V. AU BUMBAR, I.V. AU KRIVUTSA, Z.F. AU POLIKUTINA, E.S. AU SURIN, R.O. PY 2025 IS 57 PB FSBEI HE Omsk SAU