@ARTICLE {MANYONG:2001, title = {Fertilizer use and definition of farmer domains for impact-oriented research in the northern Guinea savanna of Nigeria}, author = {Manyong, V. and Makinde, K. and Sanginga, N. and Vanlauwe, B. and Diels, J. }, journal = {Nutrient Cycling in Agroecosystems}, year = {2001}, volume = {59}, number = {2}, pages = {129--141}, issn = {1385-1314}, url = {http://link.springer.com/article/10.1023/A:1017522022663}, doi = {10.1023/a:1017522022663}, }