@INBOOK {MOORMANN: 1986, title = {Present land use and cropping systems in Africa}, author = {Moormann, F. R. and Juo, A. S. R. }, year = {1986}, type = {The Wetlands aamd Rice in sub-Saharan Africa edited by A.S.R. Juo and J.A. Lowe}, pages = {187--194}, }