@INBOOK {CARSKY:2004, title = {The ability to fix N is not the only key to delivery of the benefits of BNF to farmers: experience of IITA in the savannas of Africa}, author = {Carsky, R. and Sanginga, P. and Schulz, S. and Douthwaite, B. and Manyong, V. and Diels, J. and Vanlauwe, B. and Keatinge, J. }, editor = {Serraj, R. }, year = {2004}, type = {Symbiotic nitrogen fixation: prospects for enhanced application in tropical agriculture}, pages = {145--161}, publisher = {Science}, address = {Enfield, USA}, }