Assessment of Dithionite and Oxalate Extractable Iron and Aluminium Oxides on a Landscape on Basement Complex Soil in South-Western Nigeria


The study investigats the morphological, physical and chemical characteristic of a toposequence on basement complex in Ejioku area, south-western Nigeria on latitude 07°28.675'N; and longitude 004°07.219'E; 180 m above sea level at the upper slope. It terminates at the valley bottom on latitude 07°28.756'N; and longitude 004°07.229'E; 175 m above sea level. The topography of the site is moderately slope (not greater than 10%). The aim is to examine the two forms of sesquioxides (crystalline-dithionite extractible Fe & Al and amorphous-oxalate Fe & Al) and their distribution on the toposequence. The crystalline form of Fe oxide dominates all the positions and ranges from 7.2 g/kg at the valley bottom to 444.3 g/kg at the crest compared to the amorphous forms that range from 2.7 g/kg to 10.9 g/kg. The crystalline and amorphous aluminium oxide contents of the soils are low (2.9 g/kg - 43.3 g/kg and 1.3 g/kg - 8.7 g/kg respectively). There is significant negative relationship between Fed and Fed/Feo (r =-0.15; P < 0.01; n = 16). There is also a correlation between Feo and Ald (r = 0.63; P < 0.01; n = 16), FeO and FeO/Fed (r = 0.44; P < 0.01; n = 16), signifying a high level of weathering. The relatively high amount of Fed virtually at all the horizons indicates that the crystalline and less active forms of the oxides exist more on the landscape and may be responsible for the non-availability of some nutrient like phosphorus that may be sorbed to their crystals lattice. All forms of Al in the soils are low especially, the oxalate extractable forms, when compare with the dithionite extractable forms. However, there is a significant correlation between Ald and Feo/Fed (r = 0.57; P < 0.01). As a result of high accumulation of crystalline form of Fe and Al oxide with increasing depth, most especially, at the crest/upper slope, there is greater amount of concretions, nodules and plinthites which will lead to further deterioration of the soil for agricultural purposes.

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Olatunji, O. , Oyeyiola, Y. and Oyediran, G. (2015) Assessment of Dithionite and Oxalate Extractable Iron and Aluminium Oxides on a Landscape on Basement Complex Soil in South-Western Nigeria. Open Journal of Soil Science, 5, 266-275. doi: 10.4236/ojss.2015.511025.

Conflicts of Interest

The authors declare no conflicts of interest.


[1] Juo, A.S.R., Moormann, F.R. and Maduakor, H.O. (1974) Forms and Pedogenetic Distribution of Extractable Iron and Aluminum of P, Fed, and Ald in Selected Soils of Nigeria. Geoderma, 11, 167-179.
[2] Ogunkunle, A.O. (1987) Influence of Micro Topography and Sampling on the Variability of Some Chemical Properties in Southern Nigeria. Tropical Agriculture (Trinidad), 64, 111-114.
[3] Fasina, A.S., Omolayo, F.O., Falodun, A.A. and Ajayi, O.S. (2007) Granitic Derived Soils in Humid Forest of South-Western Nigeria—Genesis Classification and Sustainable Management. American-Eurasian journal of Agiculture and Environmental Science, 2, 189-195.
[4] Ojanuga, A.G. (1978) Genesis of Soils in the Metamorphic Forest Region of South-Western Nigeria. Pedolomorphic Pedologie xxviii, 1, 105-117.
[5] Onweremadu, E.U., Omeke, J., Onyia, V.N., Aguand, C.M. and Onwubiko, N.C. (2007) Inter-Horizon Variability in Phosphorus-Sorption Capability of Sesquioxide-Rich Soils Southeastern Nigeria. Journal of American Science, 3, 43-48.
[6] Guertal, W.R. (1994) The Pedologic Nature of Weathered Rock. In: Cremeens, D.L., et al., Eds., Whole Regolith Pedology, SSSA, Madison, 21-40.
[7] Ainsworth, C.C. and Sumner, M.E. (1985) Effect of Aluminum Substitution in Goethite on Phosphorus Adsorption. II. Rate of Adsorption. Soil Science Society of American Journal, 49, 1149-1153.
[8] Agbenin, J.O. (2003) Extractable Iron and Aluminum Effects on Phosphate Sorption in a Savanna Alfisol. Soil Science Society of American Journal, 67, 589-595.
[9] Udo, E.J. (1980) Profile Distribution of Iron Sesquioxides Contents in Selected Nigeria Soils. Journal of Agricultural Science, 95, 191-198.
[10] Torrent, J., Barron, V. and Schwertmann, U. (1990) Phosphate Adsorption and Desorption by Goethites Differing in Crystal Morphology. Soil Science Society of American Journal, 54, 1007-1012.
[11] Angers, D.A. and Chenu, C. (1998) Dynamics of Soil Aggregation and Carbon Sequestration. In: Lal, R., Kimble, J.M., Follett, R.F. and Stewart, B.A., Eds., Soil Processes and the Carbon Cycle, Advances in Soil Science, CRC Press, 199-206.
[12] Yaro, D.T. (2006) The Position of Plinthites in a Landscape and Its Effects on Soil Properties. PhD Thesis, Ahmadu Bello University, Zaria, 241.
[13] Okusami, T.A. and Oyediran, G.O. (1985) Slope-Soil Relationship on an Aberrant Toposequence in Ife Area of South-Western Nigeria: Variability in Soil Properties. Ife Journal of Agriculture, 7, 1-15.
[14] Amusan, A.A. and Ashaye, T.I. (1991) Granitic-Gneisis Derived Soils in Humid Forest Tropical South Western Nigeria I: Genesis and Classification. Ife Journal of Agriculture, 13, 1-10.
[15] Smyth, A.J. and Montgomery, R.F. (1962) Soil and Land Use in Central Western Nigeria. Govt. Press, Ibadan.
[16] Mehlich, A. (1984) Mehlich-III Soil Test Extractant: A Modification of Mehlich II Extractant. Communication in Soil Science and Plant Analysis, 15, 1409-1416.
[17] Murphy, J. and Riley, J.P. (1962) A Modified Single Solution Method for the Determination of Phosphate in Natural Waters. Analytica Chimica Acta, 27, 31-36.
[18] Jackson, M.L., Lim, C.H. and Zelazny, L.W. (1986) Oxides, Hydroxides and Aluminosilicates. In: Klute, A., Ed., Methods of Soil Analysis, Part 1, Physical and Mineralogical Methods, 2nd Edition, Agronomy Monogram 9, ASA and SSSA, Madison, 101-150.
[19] McKeague, J.A. (1978) Manual on Soil Sampling and Methods of Analysis. 2nd Edition, Canadian Society of Soil Science, Ottawa, 212 p.
[20] Gee, G.W. and Or, D. (2002) Particle Size Analysis. In: Dane, J.H. and Topp, G.C., Eds., Methods of Soil Analysis, Part 4, Physical Methods, Soils Science Society of America, Book Series No. 5, Madison, 255-293.
[21] Nelson, D.W. and Sommers, L.E. (1982) Total Carbon, Organic Carbon and Organic Matter. In: Page, A.L., Miller, R.H. and Kenney, D.R., Eds., Methods of Soil Analysis, Part 2, American Society of Agronomy, Madison, 539-579.
[22] Soil Survey Staff (2006) Keys to Soil Taxonomy. 9th Edition, US Department of Agriculture, NRCS, Washington DC, 281.
[23] Fitzpatrick, R.W. and Schwertmann, U. (1982) Al-Substituted Goethite: An Indicator of Pedogenic and Other Weathering Environments in South Africa. Geoderma, 27, 335-347.
[24] Akinremi, O.O., Armisen, N., Kashemand, A. and Janzen, H.H. (2003) Evaluation of Analytical Methods for Total P in Organic Amendments. Communications in Soil Science and Plant Analysis, 34, 2987-2997.
[25] Simard, R.R., Beauchemin, S. and Haygarth, P.M. (2000) Potential for Preferential Pathways of Phosphorus Transport. Journal of Environmental Quality, 29, 97-105.
[26] FAO-ISRIC-ISSS (Food and Agriculture Organization of the United Nations, International Soil Reference and Information Centre, International Society for Soil Science) (2006) World Reference Base for Soil Resources. Report No. 103, FAO, Rome.
[27] Buol, S.W., Hole, F.D. and McCracken, R.J. (1980) Soil Genesis and Classification. Iowa State University Press, Ames, 404 p.
[28] Obi, J.C., Akinbola, G.E. and Anozie, H.I. (2009) Distribution of Dithionite and Oxalate Extractable Iron Oxides of a Catena in the Basement Complex of South-Western Nigeria. Nigeria Journal of Soil Science, 19, 100-119.
[29] Ashaye, T.I. (1969) Sesquioxide Status and Particle Size Distribution in Twelve Nigerian Soils Derived from Sandstones. African Soils Journal, 14, 85-96.
[30] Ibia, T.O. (2001) Forms of Fe and Al in Soil Particles of Inland Flood Plains of South-Eastern Nigeria. Proceeding of the 27th Annual Conference of the Soil Science Society of Nigeria, Calabar, 5-9 November 2001, 165-168.
[31] Obigbesan, G.O. (2001) Plant Mineral Nutrition in Nigeria: My Experience. In: Akorodon, M.O., Ed., Agronomy in Nigeria, Department of Agronomy, University of Ibadan, Ibadan, 188-194.

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