@ARTICLE {ASADU:2002a, title = {Comparative evaluation of the contributions of soil physicochemical properties to variations in the yields of four major staple food crops in eastern Nigeria}, author = {Asadu, C. * and Dixon, A. and Okechukwu, R. }, journal = {Soils and Tillage Research}, year = {2002}, volume = {65}, number = {2}, pages = {141--155}, issn = {0167-1987}, }