Soil Organic Carbon Pool Assessment and Chemical Evaluation of Soils in Akure North and South Local Government Area of Ondo State
Aggregate soil carbon distribution and stock in the soil in the form of a carbon pool is important for soil fertility and sequestration. The amount of carbon pool and other nutrients statues of the soil are to benefit plants, animal and the environment in the long run. This study was carried out at Akure North and South Local Government; the study area is one of the 18 Local Government Areas of Ondo State in the Southwest geo-political zone of Nigeria. The sites were divided into Map Grids and geo-referenced with Global Positioning System (GPS). Horizons were designated and morphological description carried out on the field. Pedons were characterized and classified according to USDA soil taxonomy. The local government area shares boundaries with; Ikere Local Government (LG) in the North, Ise Orun LG in the northwest, Ifedore LG in the northeast Akure South LG in the East, Ose LG in the South East, and Owo LG in the South. SOC-pool at Federal College of Agriculture topsoil horizon A2 is significantly higher than all horizons, 67.83 th⁻¹. The chemical properties of the pedons have shown that the soil is very strongly acidic to neutral reaction (4.68 – 6.73). The nutrients status of the soil topsoil A1 and A2 generally indicates that the soils have a low potential for retaining plant nutrients, and therefore call for adequate soil management.
 Brady, N.C and Weil, R.R. (2002): Micronutrients and other trace elements. In the nature and properties of soils. 13th edition. Pearson education, Inc and Dorling Kindersley (India) publishing Inc. limited South India. Pp. 655-683
 Lal, R. (2009): Soil carbon sequestration for climate change mitigation and food security. In: Souvenir, Platinum Jubilee Symposium on Soil Science in Meeting the Challenges to Food Security and Environmental Quality. Indian Society of Soil Science, New Delhi, pp. 39–46.
 Soil Survey Staff, (1996): Soil Survey Laboratory Manual. Soil Survey Investigations Report. No. 4. Version 3.0
 IPCC, (2006): The Intergovernmental Panel on Climate Change Supplement to the IPCC Guidelines for National Greenhouse Gas
 Schoeneberger et al., (2002): Survey Laboratory Methods Manual (Soil Survey Staff, 2004) publications, Soil Survey Staff, 1998;
 Benedict, O. U. (2015). Comparative Effects of Lime, Poultry Manure and Npk Compound Fertilizer on Soil Physicochemical Properties and Yield of Maize in an Ultisol of Southeastern Nigeria (Doctoral dissertation).
 Udoh, E.J., Ibia, T.O., Ano, A.O and Esu, I.E. (2009): Manual of Soil and Water Analysis, Sibon Books Ltd. Flat 15, Block 6, Fourth Avenue, Festac, Lagos.
 Walkley, A. (1947): A critical examination of a rapid method for determining organic carbon in soils - effect of variations in digestion conditions and of inorganic soil constituents. Soil Sci. 63:251-264.
 Bray, R.H and Kurtz, LT. (1945). Determination of total organic and available forms of phosphate soils. Soil Science 59:225-229.
 Bremner J.M (1996). Total Nitrogen. In: Sparks, D.L (Ed). Methods of Soil Analysis, Part 3. Chemical Methods, American Society of Soil Science, Book Series 5, Madison, Wisconsin, USA. Pp 1085-1121.
 Gartley, Karen. 1995. Recommended Soluble Salts Tests. p. 70-75. In J. Thomas Sims and A. Wolf (eds.) Recommended Soil Testing Procedures for the Northeastern United States. Northeast Regional Bulletin #493. Agricultural Experiment Station, University of Delaware, Newark, DE.
 Chude, V. O., Malgwi, W. B., Amapu, I. Y., and Ano, O. A. (2011). Manual on Soil Fertility Assessment for Federal Fertilizer Department (FFD) Abuja, Nigeria. Ethiopian Journal of Natural Resources, 4(2), 199-215.
 Young, A. (1980): Tropical Soils and Soil Survey. Cambridge University Press, New York: Pp. 468
 Aruleba. J. O. and Ogunkunle, A.O. (2006). Characterization, classification and suitability
 Greenland D. J., Wild A. and Adam D, (1992). Organic matter dynamics in soils of the tropics from myth to complex reality. In: myths and science of soils of the tropics. (Eds Lar R, Sanchez Pa) SSSA Spec Publication no. 29, SSSA & ASA, Madison, WI. 17-33
 Osodeke, V.E., Nwotiti, I.L. and Nuga, B.O. (2005): Sesquioxide Distribution along Topo-Sequence in Umudike Area of Southeastern Nigeria. Electronic Journal of environmental, Agricultural and food chemistry.4 (6):1117-1124.
 Smith, J.L and J.W. Doran.1996 measurement and use of pH and electric conductivity for soil quality analysis Page169-185 In J.W. Doran and A.J. Jones (ed) Method of assessing soil quality. Soil society of America. Spec.Publication.49.SSSA, Madison
 Thomas, G. W. (1996). Soil pH and soil acidity. Methods of soil analysis: part 3 chemical methods, 5, 475-490.