@INBOOK {POKU:1984a, title = {Effect of tillage and herbicide on cowpea weed control and yield in the subhumid tropics (abstract)}, author = {Poku, J. and Akobundu, I. }, year = {1984}, type = {Abstracts of the 1984 Meeting of the Weed Science Society of America, edited by J.F. Ahrens}, publisher = {Champaign: WSSA}, }