This study is based on the work of Dr. D.G. Mudimu, Senior Lecturer, University of Zimbabwe. It has benefited from the contributions of K. Isherwood (consultant, FAO), J. Poulisse and T. van den Bergen (FAO).
Background photograph (maize): FAO Mediabase, FAO/20355/ P. Diana.
Other photographs: FAO Mediabase, FAO/17720/A. Conti (cotton), FAO/5215/C. Fraser (tobacco); and EcoPort (sugar cane E. van Wik).
