Muhammad, A, BA Gambo, and ND Ibrahim. “Response of Onion (<i>Allium cepa</I> L.) to Irrigation Intervals and Plant Density in Zuru, Northern Guinea Savanna of Nigeria”. Nigerian Journal of Basic and Applied Sciences 19, no. 2 (February 18, 2012). Accessed August 19, 2026. https://www.ajol.info/index.php/njbas/article/view/73920.