TY JOUR TI PROTEIN AND ITS FRACTIONAL COMPOSITION IN GRAIN OF SPRING WHEATDEPENDING ON TILLAGE SYSTEMS AND WEED INFESTATION OF CROPS KW wheat KW protein KW fractional KW system KW subtype KW spring JO Bulletin Samara State Agricultural Academy AU Bakaeva, N.P. AU Saltykova, O.L. PY 2017 IS 2 PB Samara State Agrarian University