Gateri, M. W., R. Nyankanga, J. Ambuko, and A. W. Muriuki. “Optimizing Nitrogen Application in Onion (Allium Cepa L.): Influence of Rate and Time of Topdressing on Growth, Yield and Quality”. New Perspectives in International Plant and Soil Research Vol. 1 (August 22, 2019): 102-120. Accessed June 19, 2026. https://stm1.bookpi.org/index.php/npipsr-v1/article/view/317.