1. Anderson, J.M., Ingram, J.S.I., 1989. Tropical Soil Biology and Fertility: A Handbook of Methods. CAB International, Aberystwyth, UK, p. 171.
2. Effect of intercropping maize and closely spaced Leucaena hedgerows on soil conservation and maize yields on a steep slope at Ntcheu;Banda;Malawi Agrofor. Syst.,1994
3. Benson, T.D., 1997. Spatial and temporal variation in fertilizer recommendations for maize grown by smallholders in Malawi. In: Benson, T. (Ed.), Maize Commodity Team Annual Report 1995/1996, Department of Agricultural Research, Ministry of Agriculture and Irrigation, Chitedze Research Station, Lilongwe, Malawi, pp. 135–144.
4. Green manuring and soil management;Blackshaw;Rhodesian Agric. J.,1921
5. The results of some short-term rotation experiments in Nyasaland;Brown;Rhodesian Agric. J.,1958