@ARTICLE {OHIRI:1990, title = {Tillage effects on cassava (Manihot esculenta) production and some soil properties}, author = {Ohiri, A. C. and Ezumah, H. C. }, journal = {Soil Tillage Research}, year = {1990}, volume = {17}, pages = {221--229}, note = {RTB; Root and Tuber; Cassava}, }