@ARTICLE {EZUMAH:1987c, title = {Maize-cowpea intercropping as affected by nitrogen fertilization}, author = {Ezumah, H. C. and Nam, N. K. and Walker, P. }, journal = {Agronomy Journal}, year = {1987}, volume = {79}, number = {2}, pages = {275--280}, issn = {0002-1962}, note = {CRP Maize; Maize; CRP Grain Legumes; Cowpea}, doi = {10.2134/agronj1987.00021962007900020020x}, }