@INPROCEEDINGS {KAMARA:2002, title = {Nitrogen use efficiency of some maize genotypes improved or selected for tolerance to low nitrogen and drought stress}, author = {Kamara, A. and Menkir, A. and Sanginga, P. }, booktitle = {Proceedings}, year = {2002}, location = {Witzenhausen, Germany}, note = {Conference on Challenges to organic farming and sustainable land use in the tropics and subtropics, 9-11 October}, }