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Nodulation, Nitrogen Fixation and Productivity of Cowpea (Vigna unguiculata) Varieties as Influenced by Rhizobial Inoculation and Phosphorus Application on Farmers’ Fields in Minna, Southern Guinea Savanna of Nigeria. 2018 by O.A. Adediran, A. O. Osunde, A. Bala, M. Dianda, H. Ibrahim, O. O. Olufajo and J. A. Oladiran.