TY JOUR TI PECULIARITIES OF LEAF DEVELOPMENT OF WORLD COLLECTION WHEAT SAMPLES OF RUSSIAN INSTITUTE OF PLANT GROWING IN THE STEPPE ZONE OF ORENBURG URALS KW wheat KW variety KW ecotype KW leaf KW amount KW steppe zone JO Vestnik of Kazan State Agrarian University AU Samuilov, F.. AU Timoshenkova, T.A. PY 2017 IS 12 PB Kazan state agrarian University