The investigation was carried out between October – December, 2004 in the Botanical garden of School of Technology, Kano with the aim to assess the influence of phosphorus fertilizer (P205) at 50kg/ha – recommended dose on the development of root nodules in two legumes, cowpea and soybean commonly grown in Kano State. The study involved Completely Randomized Design (CRD) with four replications on 100m2 land splitted into four beds, two each for cowpea and soybean allocated for treatment and control respectively. Result of the nodules count obtained in soybean and cowpea have both shown significant (P