1. Association of Official Analytical Chemists (AOAC), 1965. Official Methods of Analysis, 11th Edition. AOAC, Washington, DC, USA.
2. A comparative characterization of two foot-slope soils in Nsukka area of eastern Nigeria;Asadu;Soil Sci.,1990
3. Asadu, C.L.A., Bosah, C.S., 2002. A comparative study of the soils of the upper coal measure residua under cropped-grass-forest land continuum in eastern Nigeria. East Afr. Agric. For. J., in press.
4. Asadu, C.L.A., Dixon, A.G.O., 2000. A comparison of the changes in properties of soils of virgin forest and previously cultivated land due to seven crop combinations. Paper Presented at the Annual Conference of the Soil Science Society of Nigeria, Ibadan, 30 October–3 November 2000.
5. Food crop yields and soil properties under population pressure in sub-Saharan Africa: the case of cassava in southeast Nigeria;Asadu;Outlook Agric.,1997