Sharaf , A. and Omer, A. 2026. The impact of drum rotational speed and feeding rate on the performance of a wheat threshing machine Productivity Energy, and cost. Sana’a University Journal of Applied Sciences and Technology . 4, 3 (Mar. 2026), 1831–1843. DOI:https://doi.org/10.59628/jast.v4i3.2204.