Nitrogen Fertilization Effect on Grain Sorghum (Sorghum bicolor L. Moench) Yield, Yield Components and Witchweed (Striga hermonthica (Del.) Benth) Infestation in Northern Ethiopia

Gebrelibanos Gebremariam and Dereje Assefa

International Journal of Agricultural Research 10 ( 1 ): 14 - 23 , 2015