@ARTICLE {SHIWACHI:2004, title = {Nutrient deficiency symptoms in yams (Dioscorea spp.)}, author = {Shiwachi, H. and Okonkwo, C. and Asiedu, R. }, journal = {Japanese Journal of Tropical Agriculture}, year = {2004}, volume = {48}, number = {2}, pages = {73--74}, note = {RTB; Root and Tuber; Yam}, }