@INPROCEEDINGS {ADEJOBI:2002, title = {Determinants of manure use in crop production in northern guinea savanna zone of Nigeria}, author = {Adejobi, A. O. * and Kormawa, P. }, booktitle = {Proceedings}, year = {2002}, publisher = {Witzenhausen, Germany}, note = {Paper presented at: Conference on Challenges to organic farming and sustainable land use in the tropics and subtropics, 9-11 OCtober}, }