TY JOUR TI The size of under-ear interstice and productivity of spring soft wheat varieties of different ecological groups in the forest-steppe of Orenburg region KW variety KW wheat KW ecotype KW interstice KW assessment of stability KW productivity. JO Vestnik of Kazan State Agrarian University AU Mukhitov, L.. AU Samuilov, F.. PY 2014 IS 9 PB Kazan state agrarian University