@ARTICLE {KANG:1976, title = {Response of flooded rice grown on a vertisol from northern Nigeria to zinc sources and methods of application}, author = {Kang, B. T. and Okoro, E. }, journal = {Plant and Soil}, year = {1976}, month = {February}, volume = {44}, number = {1}, pages = {15--25}, issn = {0032-079X}, doi = {10.1007/bf00016951}, }