@INBOOK {KOLAWOLE:2002, title = {Differential response of cowpea lines to application of P fertilizer}, author = {Kolawole, G. and Tian, G. and Singh, B. }, year = {2002}, type = {Challenges and opportunities for enhancing sustainable cowpea production:}, pages = {319--328}, note = {Proceedings of the World Cowpea Conference III held at the International Institute of Tropical Agriculture (IITA), Ibadan, Nigeria, 4-8 September 2000}, }