1. Araki S. (1993) Effect on soil organic matter and soil fertility of the chitemene slash-and-burn practice used in northern Zambia. In: Mulongoy K. and Merckx R. (eds) Proceedings: Soil Organic Matter Dynamics and Sustainability of Tropical Agriculture. Wiley-Sayce, Chichester, UK, pp. 367–75.
2. Blackie M. J. (1994) ‘Maize productivity for the 21st century: The African Challenge,’ Outlook on Agriculture 23: 189–95.
3. Blackie M. J. and Jones R. B. (1993) ‘Agronomy and increased maize productivity in eastern and southern Africa.’ Biological Agriculture and Horticulture 9, 147–60.
4. Buddenhagen I. (1992) ‘Prospects and challenges for African agricultural systems: An evolutionary approach,’ Paper presented at the Carter Lecture Series on Sustainability in Africa: Integrating Concepts. University of Florida, Gainsville, USA.
5. Byerlee D., Anandajayasekeram P., Diallo A., Gelaw B., Heisey P. W., Lopez-Pereira M., Mwangi W., Smale M., Tripp R. and Waddington S. (1994) Maize Research in Sub-Saharan Africa: An Overview of Past Impacts and Future Prospects. CIMMYT Economics Working Paper 94–03, Mexico, D. F.