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Iwuafor, E.N.O. ,  Yusuf, A.A. ,  Abaidoo, R.C. ,  Ulufajo, OO ,  Sanginga, Nteranya ,  [Residual benefits of two cowpea genotypes and natural fallow to subsequent maize in the northern Guinea savanna of Nigeria] ,  Residual benefits of two cowpea genotypes and natural fallow to subsequent maize in the northern Guinea savanna of Nigeria

Yusuf, A.A. ,  Iwuafor, E.N.O. ,  Abaidoo, R.C. ,  Olufajo, O.O. ,  Sanginga, Nteranya ,  [Grain legume rotation benefits to maize in the northern Guinea savanna of Nigeria: fixed-nitrogen vs other rotation effects] ,  Grain legume rotation benefits to maize in the northern Guinea savanna of Nigeria: fixed-nitrogen vs other rotation effects