Muhammad, A., Gambo, B. and Ibrahim, N. 2012. 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, 2 (Feb. 2012). DOI:https://doi.org/10.4314/njbas.v19i2.