TY JOUR TI THE PRODUCTIVITY OF SPRING WHEAT DEPENDING ON WAYS OF BASIC SOIL CULTIVATION AND FERTILIZERS KW wheat KW yield KW protein KW fertilizers KW agricultural technology KW efficiency JO Bulletin Samara State Agricultural Academy AU Bakaeva, N.P. AU Saltykova, O.L. PY 2019 IS 4 PB Samara State Agrarian University