@ARTICLE {GICHURU:1991, title = {Residual effects of natural bush, Cajanus cajan, and Tephrosia candida on the productivity of an acid soil in southeastern Nigeria}, author = {Gichuru, M. }, journal = {Plant and Soil}, year = {1991}, volume = {134}, number = {1}, pages = {31--36}, issn = {0032-079X}, note = {(Also published as Pages 417-422 in Plant-soil interactions at low pH, edited by R.J. Wright, V.C. Baligar, and R.P. Murrmann, Kluwer Academic Publishers, Dordrecht, the Netherlands.)}, }