MBONU, O. A. (2003). Spatial Variability of Some Soil vol.11:42-46.Physical Properties of an Alfisol. Afri. J. of Agric. Res., vol. 1(1&2):77-82.
Abstract:
The spatial variability of some soil physical properties of a loamy sand alfisol in Ibadan (3°61E and 6°81 N) in the northernmost part of the rainforest zone of Nigeria, was evaluated. Undisturbed soil samples were taken at 3m apart and at 0-5, 5-10, 10-20, 20-30 and 30-60cm depths, for determination of bulk density, macro porosity, total porosity, saturated hydraulic conductivity and moisture characteristics. Disturbed samples were also collected from the same points for particle size analysis. Correlation coefficient(r) arid regression equations were detem7ined for some properties Coefficients of variability (CV) ranged between 0.3 and 3.7, 0.8 and 8.0, 4.5 and 33.0, 0.9 and 3.4, 0.58 and 6.8 and 19.6 end 34.6% for sand ,clay and silt contents, bulk density, total porosity and saturated hydraullic conductivity respectively. The CV for moisture contents increased with decreasing moisture potentials. There were very low correlation coefficient (r) values between saturated hydraullic conductivities and macro potosity (r=0.14) and total porosity (r = 0.32).