1. Ali, M., 1990. Pigeonpea: cropping systems. In: Nene, Y.L., Hall, S.D., Sheila, V.K. (Eds.), The Pigeonpea. CAB International, Wallingford UK and ICRISAT, Hyderabad, India, pp. 279–302
2. Araki, S., 1993. The effect of burning, ash fertilization and soil organic matter on productivity of the Chitemene shifting cultivation in northern Zambia. In: Mulongoy, K., Merckz, R. (Eds.), Soil Organic Matter Dynamics and Sustainability of Tropical Agriculture. Leuven, Belgium, Leuven, pp. 367–375
3. Ashby, J., Sperling, L., 1994. Institutionalising participatory, client-driven research and technology development in agriculture. Agricultural Administration (Research and Extension) Network Paper 49. ODI: London, UK, 21 pp
4. Organic matter in soil particle size and density fractions from maize and legume cropping systems;Barrios;Soil Biol. Biochem.,1996
5. Biomass production, N accumulation, symbiotic effectiveness and mineralization of green manures in relation to yield of wetland rice;Beri;Trop. Agric.,1989