TY JOUR TI Models of spring wheat variety, adapted to the forest-steppe zone of the Urals of Orenburg KW spring wheat KW variety KW biotype KW the relationship with the morphological and physiological characteristics KW sustainability KW productivity KW model. JO Vestnik of Kazan State Agrarian University AU Mukhitov, L.. AU Samuilov, F.. PY 2013 IS 8 PB Kazan state agrarian University