Abstract
The soils in Khana area, Rivers State, were classified using the USDA Soil Taxonomy Classification System. Seven soil pedons were sampled, focusing on genetic horizons, along three transects and on five major land-use types. All pedons displayed Cambic subsurface horizons beneath epipedons. USDA Soil classification of pedons in Khana area are mainly Inceptisols and Ultisols. Soil pH ranged from moderately acidic (5.7 – 6.9) across various pedons. Total Nitrogen content varied significantly (p < 0.05), with cultivated land having the lowest (0.4g/kg) and forested soil having the highest (2.3g/kg) surface horizon values. Exchangeable bases (Potassium, Magnesium, Calcium, Sodium) also varied significantly (p < 0.05), spanning from 0.28 - 2.00 cmol/kg; 0.01 - 1.96 cmol/kg; 0.50 - 2.00 cmol/kg; and 0.25 - 1.64 cmol/kg for Potassium, Magnesium, Calcium, and Sodium, respectively. Bulk density, saturated hydraulic conductivity, and mean weight diameter differed significantly (P < 0.05) among land-use types. Saturated hydraulic conductivity ranged from 1.0 - 54.0 cm/hr, bulk density from 1.64 – 1.59 g/cm³, and mean weight diameter from 1.677 – 0.597. Particle size distribution ranged from 437.0 - 787.0 g/kg; 137.0 - 300 g/kg; and 46.0 - 350.0 g/kg for sand, silt, and clay fractions, respectively. Clay content increased with depth. Among the pedons, four were generally Ultisols (Typic Hapludolls), while three (from Eeke, Taabaa, and Okwale communities) were Inceptisols (Arenic Eutrudepts). Overall, this study provides insight into the soil properties of Khana area, enabling recommendations for optimized crop cultivation, and soil management in poorly drained subsoil regions.
References
Abam, T. K. S. (2001). Regional hydrological research perspectives in the Niger Delta. Hydrological sciences journal, 46(1), 13-25. Adekola, O., & Mitchell, G. (2011). The Niger Delta wetlands: threats to ecosystem services, their importance to dependent communities and possible management measures. International Journal of Biodiversity Science, Ecosystem Services & Management, 7(1), 50-68. Adhikari, K., & Hartemink, A. E. (2016). Linking soils to ecosystem services—A global review. Geoderma, 262, 101-111. Ahn, P.M. (1970). West African Soils. Oxford University Press. Ely House, London, W.I. 1970, Andrews, S. S., Karlen, D. L., & Cambardella, C. A. (2004). The soil management assessment framework: a quantitative soil quality evaluation method. Soil Science Society of America Journal, 68(6), 1945-1962. Black, G.R and Hartge, K.H. (1986). Bulk density. In: klute, A (ed.) Methods of Soil Analysis. Part I. Physical and Mineralogical Methods. Agron. Monogr. 9. 2nd ed. ASA and SSSA. Madison. Brevik, E. C., Calzolari, C., Miller, B. A., Pereira, P., Kabala, C., Baumgarten, A., & Jordán, A. (2016). Soil mapping, classification, and pedologic modeling: History and future directions. Geoderma, 264, 256-274. Esu Ejemot, I. (2010). Soil Characterisation, Classification and Survey. 232. Gee, G. W. & Or, D. (2002). Particle size analysis. In: J. H. Dane & G. C. Topp (eds.) Methods of soil analysis, part 4, Physical methods. Soil Science Society of American Book series. No 5 ASA and SSSA, Maidson, Wisconsin: 255-293. Kamalu, O. J., Udom, B. E., Omenihu, A. A. (2017). Assessment of soil quality in representative pedons of the Sombreiro Warri Deltaic plain of the Niger Delta Nigeria. International Journal of Agriculture and Earth science Vol. 3. No. 5. ISSN 2489-0081 Needam, B.G. Wokocha,C. C. & Kamalu O. J. (2020). Land use Change Detection of Khana Local government area of Rivers State Using Remote Sensing and GIS. International Journal of Advances in Scientific Research and Engineering, 06(12), 01–08. https://doi.org/10.31695/ijasre.2020.33743 Njoku, J. D. (2013). Agro-Ecological Assessment of Soil Quality of a River Watershed in the Niger Delta Region of Nigeria. J. Environ. Earth Sci, 3, 48-56. Rayment, G.E. & Higginson, F.R. (1992). Australian Laboratory Handbook of soil & water chemical methods, Melbourne, Inkata press. (Australian Soil & Land Survey Handbooks Vol. 3) Soil Survey Staff - NRCS/USDA. (2014). Keys to soil taxonomy. Soil Conservation Service, 12, http://www.nrcs.usda.gov/Internet/FSE_DOCUMENTS/nrcs142p2_051546.pdf Soil Survey Staff. 1999. Soil taxonomy: A basic system of soil classification for making and interpreting soil surveys. 2nd edition. Natural Resources Conservation Service. U.S. Department of Agriculture Handbook 436. Tuttle, M. L., Charpentier, R. R., Brownfield, M. E. (1999) The Niger Delta petroleum system: Niger Delta province, Nigeria, Cameroon, and Equatorial Guinea, Africa. United States geologic survey. Retrieved 6 March 2015. Udoh, B. T., Esu, I. E., Ibia, T. O., Onweremadu, E. U., & Unyienyin, S. E. (2013). Agricultural potential of the beach ridge soils of the Niger Delta, Nigeria. Ugwa, I. K., Orimoloye, J. R., Kamalu, O. J., & Obazuaye, E. (2017). Morpho-Physical Properties and Related Management Implications of Some Inceptisols in Two Ecological Zones of Southern Nigeria. Futo Journal Series (FUTOJNLS), 3(1), 258–272. www.futojnls.org Zabbey, N., Giadom, F. D., & Babatunde, B. B. (2019). Nigerian coastal environments. In World seas: An environmental evaluation (pp. 835-854). Academic Press.
