@BOOK {COUPER:1995c, title = {No-till farming in the humid and subhumid tropics of Africa: IITA research guide, No. 3}, author = {Couper, D. C. }, series = {IITA research guide, No. 3}, year = {1995}, month = {July}, publisher = {International Institute of Tropical Agriculture (IITA)}, address = {Ibadan, Nigeria}, note = {26p.}, }