Abstract: This study was conducted using soils from nine selected locations (Agege, Amassoma, Bakolori, Nsukka, Onne, Olupano, the polytechnic Ibadan, University
of Ibadan and Zaria) to determine the effect of some nutrients and rhizobium on the nodulation of cowpea [Vigna unguiculata (L.) Walp]. Four greenhouse experiments
were conducted. The treatments consisted of control, boron, zinc, copper, managanese, combination of micronutrients, combination of micronutrients + Nitrogen (all
with inoculant) and Combination of micronutrients – inoculant. The control for the third greenhouse experiment was without micronutrients and inoculant. The fourth
greenhouse experiment was on effect of NPK on nodulation and growth of cowpea. The greenhouse experiments were laid out in Completely Randomized Design and
replicated four times. The results revealed that the inoculant had no significant effect generally on nodulation in all the soils both in the greenhouse. Agege soil had the
highest number of nodules, nodule weight and nodule volume while Bakolori recorded the least (p>0.05). The treatment Combinations without the inoculant had the
highest nodule weight (0.69 g/plt), zinc (1.29 g/plt) and boron (1.92 g/plt). After seven weeks of four greenhouse experiments, the nodulation was very low despite
additions of nutrients.
Keywords: Greenhouse, micronutrients, nodulation, organic matter, treatments.jaerem NEW Torunana J. M. A 25A
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