@ARTICLE {HILL:1990, title = {Sweet potato root and biomass production with and without nitrogen fertilization}, author = {Hill, W. A. and Dodo, H. W. and Hahn, S. K. and Mulongoy, K. and Adeyeye, S. O. }, journal = {Agronomy Journal}, year = {1990}, volume = {82}, number = {6}, pages = {1120--1122}, issn = {0002-1962}, note = {RTB; Root and Tuber; Sweetpotato}, }