International Journal of Soil Science1816-4978xxxx-xxxxAcademic Journals Inc.10.3923/ijss.2021.1.12IrenO.B.UdohD.J.EdieneV.F.AkiE.E.12021161Background and Objective: Most of the soils of South-eastern Nigeria are strongly acidic. Liming these soils for profitable crop production requires the assessment of the soil properties and then developing model equations for calculating liming rates. This study aimed to assess the soil properties and then develop model equations and curves for quick calculations of liming rates. Materials and Methods: Soil samples were collected at 40 different locations in Cross River and Akwa Ibom States and analyzed. An incubation study was also performed to monitor changes in pH bi-weekly in the laboratory. Neutralization curves were constructed by plotting a maximum rise in pH against lime rates. Results: The soils were separated into particle-size classes, A (sandy clay loam and clay soils) and B (sandy loam and loamy sand soils). Soil properties were higher for group A than B. Multiple regression equations created provided several equations for calculating Lime Requirements (LR). The equations were: Group-A: LR = 0.33+0.28ΔpHxOM+0.18ΔpHxclay [R^{2} = 0.855]. Group-B: LR = 0.98+0.58Δ pHxOM [R^{2} = 0.552]. Conclusion: Over-liming can generate alkaline conditions that may create solubility problems. Therefore, both the regression equations and the curves are useful tools for quick determinations of lime requirement.]]>Iren, O.B., D.J. Udoh, U.O. Ufot and J.N. Chukwuemeka,2016Telfairia Occidentalis) performance in an ultisol of Southeastern Nigeria.]]>Amedee, G. and M. Peech,1976Uchida, R.S. and N.V. Hue,2007Iren, O.B. and I.J. Ibanga, 2008Iren, O.B. and U.C. Amalu,2012Elaeis guineensis, Jacq) plantations in cross river state, Nigeria.]]>Bello, O.S. and A.E. Udofia,2013Iren, O.B. and I.D. Uwah,2018Talinum fructicosum (L.) Juss.) in an ultisol of southeast Nigeria.]]>Udoh, D.J., O.B. Iren and J.E. Jonathan,2016Opala, P.A., M. Odendo and F.N. Muyekho,2018Russel, E.W.,1973Sanchez, P.A.,1976Shoemaker, H.E., E.O. Mclean and P.F. Pratt,1961Jones, J.B.,2001Nelson, D.W. and L.E. Sommers,1983Nelson, D.W. and L.E. Sommers,1980Bray, R.A. and L.T. Kurtz,1945Murphy, J. and J.P. Riley,1962Aitken, R.L., P.W. Moody and T. Dickson,1995Rowell, D.L., 1994Ibanga, I.J., N.B. Umoh and O.B. Iren,2008Millaleo, R., M. Reyes-Diaz, A.G. Ivanov, M.L. Mora and M. Alberdi,2010Brady, N.C. and R.R. Weil,1999