1. Nkwopara, U.N., 2018. Variability in selected soil properties of soils of dissimilar parent materials in the humid tropics. Int. J. Environ. Agric. Biotechnol., 3: 1467-1472.
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2. Nkwopara, U.N. and H. Hu, 2018. Sorption of lead on variable charged soils as affected by temperature and time in three Provinces of China. Int. J. Environ. Agric. Biotechnol., 3: 1486-1492.
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3. Nkwopara, U.N., E.E. Iwuchukwu, N.H. Okoli , A. Osisi, E.E. Ihem and S.U. Onwudike, 2017. Vertical distribution of cadmium in selected soils of varying lithosequences in a humid tropical environment. Int. J. Agric. Rural Dev., 20: 3159-3164.
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4. Ihem, E.E., U.N. Nkwopara, B.N. Ndukwu and S.U. Onwudike, 2017. Macro-aggregate stability of soils under selected parent materials in Imo state, Nigeria. Int. J. Agric. Rural Dev., 20: 3121-3121.
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5. Onwudike, S.U., B.U. Uzoho, E.E. Ihem, C.M. Ahukaemere, U. Nkwopara, I.F. Irokwe and G.I. Echeanyanwu, 2016. Evaluation of the fertility status of selected soils in Mbaise, Imo State southeastern Nigeria using nutrient index method. Agrosearch, 16: 75-86.
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6. Okoli, N.H., B.U. Uzoho, E.U. Onweremadu, U.N. Nkwopara and I.F. Irokwe, 2016. Zinc fractionation of soils of different parent materials and their relationships with some soil properties. Malaysian J. Soil Sci., 20: 49-60.
7. Nkwopara, U.N., N.H. Okoli, A. Osisi, E.E. Ihem, I.I. Ekpe, M.A. Okon and H. Hu, 2016. Effect of some operating variables on adsorption of lead on variable charge soils of southern China. Res. J. Agric. Environ. Manage., 5: 177-186.
8. Nkwopara, U.N., E.T. Eshett, E.U. Onweremadu, E.E. Ihem and B.N. Ndukwu, 2016. Clay mineralogy of selected soils formed under different lithologies in South-eastern Nigeria. FUTO J. Ser., 2: 90-95.
9. Ndukwu, B.N., E.U. Onweremadu, U.N. Nkwopara, C.M. Ahukaemere, E.E. Ihem and L.C. Agim, 2016. Variability of selected soil properties of a river slope in Amaigbo, Southeastern Nigeria. FUTO J. Ser., 2: 8-16.
10. Ahukaemere, C.M., E.U. Onweremadu, B.N. Ndukwu and U.N. Nkwopara, 2016. Properties of soils of contrasting lithosequences in south-eastern Nigeria. FUTO J. Ser., 2: 48-56.
11. Nkwopara, U.N., C.M. Chris-Emenyonu, E.E. Ihem, B.N. Ndukwu and E.U. Onweremadu et al., 2015. Batch studies for the investigation of the mechanism of Pb sorption in selected acid soils of China. Agric. For. Fish., 4: 11-20.
12. Ndukwu, B.N., E.U. Onweremadu, C.M. Ahukaemere, E.E. Ihem, U.N. Nkwopara and D.N. Osujieke, 2015. Distribution and concentration of cadmium in automobile polluted soils in Owerri South-eastern Nigeria. Nig. J. Soil Sci., 25: 135-145.
13. Ihem, E.E., G.E. Osuji, E.U. Onweremadu, B.U. Uzoho and U.N. Nkwopara et al., 2015. Variability in selected properties of crude oil-polluted soils of izombe, Northern Niger Delta Nigeria. Agric. For. Fish., 4: 29-33.
14. Uzoho, B.U., U.N. Nkwopara, E. Ihem, C. Eke, J.C. Odum and S. Onwudike, 2014. Chemical speciation and mobility of cadmium and lead in waste dumpsite in Owerri, Southeastern Nigeria. J. Chem. Biol. Phys. Sci., 4: 1721-1734.
15. Uzoho, B.U., E. Ihem, S. Onwudike, L. Agim and U. Nkwopara et al., 2014. Phosphorus sorption capacity of soils in relation to landuse types in Mbaise, Southeastern Nigeria. J. Chem. Biol. Phys. Sci., 4: 1710-1720.
16. Omeke, J.O., U.N. Nkwopara, E.T. Eshett, S.U. Onwudike and B.U. Uzoho et al., 2014. Properties of soils of dissimilar lithology supporting yam-based cropping system in Southeastern Nigeria. Int. J. Agric. Rural Dev., 17: 1914-1925.
17. Omeke, J.O., U.N. Nkwopara, E.E. Ihem, C. Ahukaemere, B.U. Uzoho, I.U. Opara and H. Hu, 2014. Adsorption of lead on some variable charge soils in China: Effect of initial metal concentration. Int. J. Agric. Rural Dev., 17: 1926-1933.
18. Nkwopara, U.N. and H. Hu, 2014. Organic acids influence on lead adsorption onto variable charge soils in China. Int. J. Dev. Sustain., 2: 2110-2123.
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19. Ihem, E.E., C.M. Ahukaemere, U.N. Nkwopara, C. Chris-Emenyonu, N.H. Okoli and A. Osisi, 2014. Differences in particle size distribution of soils of Northern Niger Delta of Nigeria as affected by crude oil pollution. Int. J. Res. Agric. For., 1: 16-20.
20. Ihem, E.E., G.E. Osuji, E.U. Onweremadu, S.U. Onwudike, U.N. Nkwopara, B.N. Ndukwu and B.U. Uzoho, 2014. Variability in properties of soils under three land use types in a humid tropical environment. Int. J. Dev. Sustainability, 3: 923-930.
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21. Ahukaemere, C.M., U.N. Nkwopara and O.S. Ekpenyong, 2014. Profile distribution of selected essential micronutrient in paddy soils of Abia State, Southeastern Nigeria. Nig. J. Soil Sci., 24: 158-165.
22. Nkwopara, U.N., I. Mohammed, M. Ali, J. Igbal and Q. Fu et al., 2013. Impacts of inorganic ions and temperature on lead adsorption onto variable charge soils. Catena, 109: 103-109.
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23. Nkwopara, U.N., E. Ihem, L. Agim, B. Uzoho, E. Onweremwdu, C. Ahukaemere and H. Hu, 2013. Effect of temperature and mechanism of Pb sorption on selected acid soils of Southern China. Acta Agron. Niger., 13: 43-56.
24. Nkwopara, U.N., J.O. Omeke, E.T. Eshett, E. Ihem, B.N. Ndukwu and S.N. Obasi, 2012. Some physic-chemical characteristics of arable soils around selected oil exploration sites in the Niger Delta region of Nigeria. Int. J. Agric. Rural Dev., 15: 1298-1309.
25. Nkwopara, U.N., J.O. Omeke and S.N. Obasi, 2012. Assessment of Pb concentration of arable soils around oil exploration sites in Niger Delta, Nigeria. Int. J. Agric. Rural Dev., 15: 1247-1252.
26. Nkwopara, U.N., I. Ali, Q. Fu, J. Zhu, G. Jiang and H. Hu, 2012. Sorption of lead on variable-charge soils in China as affected by initial metal concentration, pH and soil properties. J. Food Agric. Environ., 10: 1014-1019.
27. Nkwopara, U.N., E.U. Onweremadu and H. Hu, 2012. Retention of lead in acid soils of Southern China: Impact of inorganic and organic anions. Int. J. Environ. Sci. Eng. Res., 3: 1-9.
28. Duruigbo, C.I., M.O. Ofor, U. Nkwopara and B.N. Ndukwu, 2008. Efficacy of siamweed mulch on soil nutrient status and maize yield in a degraded Isohyperthermic Arenic sandiudult. Int. J. Agric. Rural Dev., 11: 11-15.
29. Nkwopara, U.N., E.T. Eshett, E.U. Onweremadu, C.C. Opara and J.O. Omeke, 2007. Physico-chemical properties of selected soils overlying three parent materials in the humid tropics. Int. J. Agric. Food Syst., 1: 159-164.
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30. Onweremadu, E.U., U. Nkwopara, C. Opara, G. Ihejirika, V. Onyia and M. Ofoh, 2006. Vertical distribution of heavy metals in two soils in Isikwuato, Abia state, Southeastern Nigeria. J. Sustain. Trop. Agric. Res., 18: 17-21.
31. Onweremadu, E.U., C.C. Opara, U. Nkwopara, C.I. Duruigbo and I.I. Ibeawuchi, 2006. Yield response of a cowpea variety on ground seashells on Isohyperthermic Arenic Kandiudult of Owerri, Southeastern Nigera. Int. J. Soil Sci., 1: 251-257.
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