TY JOUR TI AFTEREFFECT OF VARIETIES AND HYBRIDS OF SPRING RAPE, GROWN ON DIFFERENT BACKGROUNDS OF MINERAL NUTRITION, ON SPRING WHEAT OF EKADA 70 VARIETY KW hybrids KW varieties KW productivity KW aftereffect KW humus KW nitrogen KW phosphorus KW potassium KW spring wheat KW gluten. JO Vestnik of Kazan State Agrarian University AU Karimov , A.. AU Safiollin, F.N. AU Minnullin, G.. PY 2015 IS 10 PB Kazan state agrarian University