@ARTICLE {LAL:1978, title = {No-till farming after various grasses and leguminous cover crops in tropical alfisol; I: crop performance}, author = {Lal, R. and Wilson, G. F. and Okigbo, B. }, journal = {Field Crops Research}, year = {1978}, volume = {1}, number = {1}, pages = {71--84}, issn = {0378-4290}, }