TY JOUR TI EARLY AND SREDNERANNY GRADES OF SPRING-SOWN SOFT FIELD OF THE SIBERIAN SELECTION, STRONG ON QUALITY OF GRAIN, AS INITIAL MATERIAL FOR SELECTION KW JO Agrarian Bulletin of the AU Kazak, A.A. AU Loginov, Y.P. PY 2018 IS 178 PB Ural State Agrarian University