@MANUAL {ONGOM:2024k, title = {Standard Operating Procedure (SOP) for site selection and field layout for cowpea}, author = {Ongom, P. O. and Togola, A. and Fatokun, C. and Mohammed, S. B. and Boukar, O. }, year = {2024}, organization = {International Institute of Tropical Agriculture}, address = {Ibadan, Nigeria}, note = {WAHub; Science Area BPB; CRP Grain Legumes; Cowpea; 8p.; Learning material}, }