Amsalu Yeshaw; Firew Kebede; Abreham Assefa. EVALUATION OF THE EFFECT OF PARTHENIUM (Parthenium Hysterophorus L.) WEED DENSITY ON THE VEGETATIVE GROWTH AND GRAIN YIELD OF TEFF (Eragrostis Tef Zucc. Trotter) IN SHEWA-ROBIT DISTRICT, NORTH SHEWA, ETHIOPIA. ejed 2021, 2, 228-243.