TY JOUR TI INFLUENCE OF PLOUGH WORKING BODIES KEY PARAMETERS FOR THE QUALITY OF TIERED PLOWING KW soil KW processing KW tiered KW combined KW options KW plow KW depth JO Bulletin Samara State Agricultural Academy AU Erzamaev, M.P. AU Sazonov, D.S. AU Mustyakimov, R.N. AU Strel'cov, S.V. PY 2017 IS 2 PB Samara State Agricultural Academy