@ARTICLE {UDO:2017, title = {Physiological and morphological changes associated with recurrent selection for low nitrogen tolerance in maize}, author = {Udo, E. F. and Ajala, S. and Olaniyan, A. *}, journal = {Euphytica}, year = {2017}, volume = {213}, number = {140}, pages = {1--13}, issn = {0014-2336}, note = {WAHub; CRP Maize; Maize; Published online 17 June 2017}, doi = {10.1007/s10681-017-1928-y}, }