1. Allison, F.E., 1973. Soil Organic Matter and its Role in Crop Production. Elsevier, New York
2. Effects of amendments on physical properties of soil under rainfed cultivation;Anjaiah;Int. Agrophys.,1987
3. Blake, G.R., Hartge, K.H., 1986. Bulk density. In: Klute, A. (Ed.), Methods of Soil Analysis, Part 1. Physical and Mineralogical Methods, 2nd edn. ASA, SSSA, Madison, USA, p 363
4. Bouwer, H. 1986. Intake rate: cylinder infiltrometer. In: Klute, A. (Ed.), Methods of Soil Analysis, Part 1, Physical and Mineralogical Methods, 2nd edn. ASA, SSSA, Madison, USA, p. 825
5. FDALR, 1985. Reconnaissance soil survey of Anambra State, Nigeria. Soils Report, FDALR, Kaduna