Awol AssefaHabtamu Sirie2025-08-312025-08-312024-08https://etd.aau.edu.et/handle/123456789/7242Sorghum [Sorghum bicolor (L.) Moench; 2n = 20] is the fifth most important crop planted worldwide, after maize, rice, wheat, and barley. It is mostly farmed in semi-arid tropical regions for food and fodder .Sorghum is a significant food crop in Central America, South Asia, and Africa (Sorghum bicolor (L.) Moench, Poaceae). Due to the striga species' ability to parasitize new crops or types and adapt to changing environmental conditions, the problem caused by infestation is predicted to get worse. Is it possible to enrich the soil to lessen striga weed's effects on yellow sorghum growth and yield? This study's main goal was to determine how different inorganic fertilizer concentrations affected the growth and yield of sorghum bicolor while striga hermonthica was present. To develop effective strategies to mitigate the effect of striga weed on the productivity of yellow sorghum. Ha: There are differences in the effects of varying fertilizer application concentrations on striga hermonthica infestation as well as on sorghum bicolor growth and production. One of the main production barriers in Ethiopia's sorghum-growing regions is Striga hermonthica (Del.) Benth (Scrophulariacae), which is made worse by the region's intrinsic low soil fertility, recurring droughts, and ongoing grain monoculture. Two varieties of Sorghum bicolor Bachete and wagere stratified with different ratings of fertilizer 0, 25, 50, and 100% fertilizer. Growth parameters were plant height, leaf number, internodal length, root collar diameter, seed number, seed weight, panicle size, and biomass were determined. The treatments were laid out under RCBD with three replications. Improved sorghum variety Wagere adapted to the area was used. The treatments (T) were (T1) no fertilizer +striga +Bachete variety as control (T2) 25% fertilizer +striga +Bachete variety (T3) 50% fertilizer +striga +Bachete variety (T4) 100% fertilizer+striga+Bachete variety (T5), no fertilizer+striga+Wagere variety (T6) 25% fertilizer+striga+Wagere variety (T7) 50% fertilizer+striga+Wagere variety (T8) 100% fertilizer+striga+Wagere variety. According to the current results, the maximum average grain yield and total biomass, head weight, and plant height were recorded prominently in plots treated with inorganic fertilizer. Generally, this experiment showed that productivity of sorghum is considerably higher when farmers use integrated soil fertility management options. Furthermore, integrated use of inorganic fertilizers vii proved to be highly effective in terms of reducing Striga incidence, both in terms of reduced seed density in the soil and decreased infection in sorghum. Based on the results obtained, it is concluded that application of inorganic fertilizer significantly (p ≤ 0.05) improved almost all the early growth performances and yield components of S. bicolor. I will recommend local farmers use inorganic fertilizer and a striga-resistant variety of sorghum wagere to enhance crop productivity. The weed causes considerable reduction of early growth and yield performances of yellow sorghum grown in semi-arid, non-fertile areas of East Gojjam, Amhara Regional State.en-USAgronomic PracticesSorghumStrigaYield ComponentThesis