Adekiya, A.O., Agbede, T.M., Ojeniyi, S.O., Ewulo, B.S., 2014. Influence of tillage and poultry manure on soil properties and cormel yield of cocoyam. Proceedings of the International Soil Tillage Research Organisation (ISTRO) Nigeria Symposium, November 3-6 2014, Akure, Nigeria, pp. 280-291
Adeyemo, A.J., Akingbola, O.O., Ojeniyi, S.O., 2019. Effects of poultry manure on soil infiltration, organic matter contents and maize performance on two contrasting degraded Alfisols in south-western Nigeria. International Journal of Recycling of Organic Waste in Agriculture 8: 73-80.
https://doi.org/10.1007/s40093-019-0273-7
Adubasim, C.V., Igwenagu, C.M., Josiah, G.O., Obalum, S.E., Okonkwo, U.M., Uzoh, I.M., Sato, S., 2018. Substitution of manure source and aerator in nursery media on sandy-loam topsoil and their fertility indices 4 months after formulation. International Journal of Recycling of Organic Waste in Agriculture 7(4): 305-312.
https://doi.org/10.1007/s40093-018-0216-8
Amorim, H.C., Ashworth, A.J., Zinn, Y.L., Saauer, T.J., 2022. Soil organic carbon and nutrients affected by tree species and poultry litter in a 17-year agroforestry site. Agronomy 12(3): 641.
https://doi.org/10.3390/agronomy12030641
Azuka, C.V. and Idu, M.C., 2021. Effect of organic manures application on soil physicochemical properties of coarse-textured Ultisol and okra productivity in Nsukka, southeastern Nigeria. Agricultural Science Digest.
https://doi.org/10.18805/ag.D-326
Bhadha, J.H., Capasso, J.M., Khatiwada, R., Swanson, S., LaBorde, C., 2017. Raising soil organic matter content to improve water holding capacity. UF/IFAS Extension 2017; Series SL447. University of Florida (UF) & Institute of Food and Agricultural Sciences (IFAS).
https://doi.org/10.32473/edis-ss661-2017
Chukwuma, C.C., Oraegbunam, C.J., Ndzeshala, S.D., Uchida, Y., Ugwu, V.U., Obalum, S.E., Igwe, C.A., 2024. Phosphorus mineralization in two lithologically dissimilar tropical soils as influenced by animal manure type and amendment-to-sampling time interval. Communications in Soil Science and Plant Analysis 55(5): 707-722.
https://doi.org/10.1080/00103624.2023.2276269
Echiegu, E.A., Eya, O.R., Ugwu, S.N., Ugwuishiwu, B., 2016. Evaluation of effluent from the University of Nigeria, Nsukka wastewater treatment plant for irrigation purposes. American Journal of Environmental Sciences 12(2): 122-130.
https://doi.org/10.3844/ajessp.2016.122.130
Eusufzai, M.K. and Fujii, K., 2012. Effect of organic matter amendment on hydraulic and pore characteristics of a clay loam soil. Open Journal of Soil Science 02(04): 372-381. https://doi.org/10.4236/ojss.2012.24044
Ezeaku, V.I., Obalum, S.E., Ezeaku, P.I., Igwe, C.A., 2020. Influence of granulometric composition and organic matter management on soil stability against water erosion in Southeastern Nigeria. Nigerian Journal of Soil Science 30(2): 103-112.
https://doi.org/10.36265/njss.2020.300213
Ezenne, G.I., Obalum, S.E., Tanner, J., 2019. Physical-hydraulic properties of tropical sandy-loam soil in response to rice-husk dust and cattle dung amendments and surface mulching. Hydrological Sciences Journal 64(14): 1746-1754.
https://doi.org/10.1080/02626667.2019.1662909
Grossman, R. and Reinsch, T., 2002. Bulk Density and Linear Extensibility. Soil Science Society of America (SSSA) Book Series.
https://doi.org/10.2136/sssabookser5.4.c9
Han, S.H., An, J.Y., Hwang, J., Kim, S.B., Park, B.B., 2016. The effects of organic manure and inorganic fertilizer on the growth and nutrient concentrations of yellow poplar in a nursery system. Forest Science and Technology Volume 12, 2016.
https://doi.org/10.1080/21580103.2015.113
Igwe, C.A., Nwite, J.C., Agharanya, K.U., Watanabe, Y., Obalum, S.E., Okebalama, C.B., Wakatsuki, T., 2013. Aggregate-associated soil organic carbon and total nitrogen following amendment of puddled and sawah-managed rice soils in southeastern Nigeria. Archives of Agronomy and Soil Science. 59(6): 859-874.
https://doi.org/10.1080/03650340.2012.684877
Klute, A. and Dirksen, C., 1986. Hydraulic conductivity and diffusivity. In: Klute, A., (Ed.), Methods of Soil Analysis Part 1 (pp. 694-783), Madison WI American Society of Agronomy, 271. https://doi.org/10.2136/sssabookser5.1.2ed.c28
Kumar, M.B. and Nair, P.K.R., 2011. Carbon Sequestration Potential of Agroforestry Systems: Opportunities and Challenges. Springer Dordrecht Heidelberg, London
Lal, Rattan, 2020. Soil organic matter and water retention. Agronomy Journal 112(5): 3265-3277.
https://doi.org/10.1002/agj2.20282
Li, J.T., Zhong, X.L., Wang, F., Zhao, O.G., 2011. Effect of poultry litter and livestock manure on soil physical and biological indicators in a rice-wheat rotation system. Plant, Soil and Environment 57(8): 351-356
Li, Y., Feng, G., Tewolde, H., Zhang, F., Yan, C., Yang, M., 2021. Soil aggregation and water holding capacity of soil amended with agro-industrial byproducts and poultry litter. Journal of Soils and Sediments. 21: 1127-35.
https://doi.org/10.1007/s11368-020-02837-3
Maillard, E. and Angers, D., 2013. Animal manure application and soil organic carbon stocks: a meta-analysis. Global Change Biology 20(2): 666-679.
https://doi.org/10.1111/gcb.12438
Nnadi, A.L., Nnanna, P.I., Onyia, V.N., Obalum, S.E., Igwe, C.A., 2020. Growth and yield responses of high-density coverage sweet potato to liming and fertilizer combinations for sandy-loam Ultisols at Nsukka, southeastern Nigeria. In: Climate-Smart Soil Management, Soil Health/Quality and Land Management: Synergies for Sustainable Ecosystem Services (pp. 263-269). Proceedings of the 44th Annual Conference of Soil Science Society of Nigeria (SSSN), 16-20 March 2020 [Colloquia SSSN 44], Enugu State University of Science & Technology, Enugu, Enugu State, Nigeria
Nwite, J.N. and Alu, M.O., 2019. Evaluation of different rates of poultry manure on soil properties and grain yield of maize (Zea mays L.) in a Typic Haplustult in Abakaliki, southeastern Nigeria. Global Journal of Agricultural Research 6(4): 24-35
Obalum, S., Eyibio, N., Azuka, C., Igwe, C., Obi, M., 2020a. Soil hydraulic properties and runoff losses as affected by cattle dung and surface mulch for sandy-loam Ultisols at Nsukka, southeastern Nigeria. In: Climate-Smart Soil Management, Soil Health/Quality and Land Management: Synergies for Sustainable Ecosystem Services (Book of Abstracts, p. 204), the 44th Annual Conference of Soil Science Society of Nigeria (SSSN), 16-20 March 2020, Enugu State University of Science & Technology, Enugu, Enugu State, Nigeria
Obalum, S.E., Ofem, K.I., Nwamba, D.C., Joseph, P.O., Edeh, I.G., Amalu, U.C., Igwe, C.A., 2024. Aggregate stability responses of three derived-savannah soils to poultry-droppings manure at different pulverisation-to-sampling time intervals. Applied Environmental Biotechnology 9(1): 38-51. http://doi.org/10.26789/AEB.2024.01.005
Obalum, S.E. and Azuka, C.V., 2021. Quantitative dimensions to systematic implementation of irrigation technology in tropical African agriculture. In: Eze, S.C., Obalum, S.E., (eds), Handbook of Practical Agriculture: A Production of the Faculty of Agriculture, University of Nigeria, Nsukka, 2nd edn (pp 108-119), University of Nigeria Press Limited, Nsukka, Nigeria
Obalum, S.E., Chibuike, G.U., Peth, S., Ouyang, Y., 2017. Soil organic matter as sole indicator of soil degradation. Environmental Monitoring and Assessment 189(4): 176. https://doi.org/10.1007/s10661-017-5881-y
Obalum, S.E., Igwe, C.A., Hermansah, Obi, M.E., Wakatsuki, T., 2011a. Using selected structural indices to pinpoint the field moisture capacity of some coarse-textured agricultural soils in southeastern Nigeria. Journal of Tropical Soils 16(2): 151-159.
https://doi.org/10.5400/jts.2011.16.2.151
Obalum, S.E., Igwe, C.A., Obi, M.E., 2012. Soil moisture dynamics under rainfed sorghum and soybean on contrasting tillage-mulch seedbeds in a mineral sandy loam at derived savanna of south-eastern Nigeria. Archives of Agronomy and Soil Science 58(11): 1205-1227. https://doi.org/10.1080/03650340.2011.575065
Obalum, S.E., Nwite, J.C., Oppong, J., Igwe, C.A., Wakatsuki, T., 2011b. Comparative topsoil characterization of sawah rice fields in selected inland valleys around Bida, north-central Nigeria: textural, structural and hydrophysical properties. Paddy and Water Environment 9(3): 291-299. https://doi.org/10.1007/s10333-010-0233-3
Obalum, S.E. and Obi, M.E., 2013. Moisture characteristics and their point pedotransfer functions for coarse-textured tropical soils differing in structural degradation status. Hydrological Processes 27(19): 2731-2735.
https://doi.org/10.1002/hyp.9398
Obalum, S.E. and Obi, M.E., 2014. Measured versus estimated total porosity along structure-stability gradients of coarse-textured tropical soils with low-activity clay. Environmental Earth Sciences 72(6): 1953-1963.
https://doi.org/10.1007/s12665-014-3102-3
Obalum, S.E., Ogumba, P.O., Uzoh, I.M., 2020b. Influence of tillage-seedbed and manure-NPK-micronutrient management options on selected soil properties of sandy-loam Ultisols evaluated using sweet potato. Nigerian Journal of Soil Science 30(3): 117-125
Obi, M.E. and Ebo, P.O., 1995. The effect of organic and inorganic amendments on soil physical properties and maize production in a severely degraded sandy soil in southern Nigeria. Bioresource Technology 51: 117-123
Oguike, P.C., Onwuka, B.M., Obalum, S.E., 2023. Soil organic matter control of water transmission properties of coarse-textured soils under contrasting land-use types in tropical rainforest. International Journal of Hydrology Science and Technology 16(1): 93-106.
https://doi.org/10.1504/IJHST.2022.10046853
Ogunezi, K.C., Okebalama, C.B., Obalum, S.E., 2019. Optimum poultry droppings rate for coarse-loamy Ultisols based on soil macro-aggregation and fertility indices and evaluation using cucumber (Cucumis sativus). Presented under Understanding Nigerian Soils for Sustainable Food & Nutrition Security and Healthy Environment, the 43rd Annual Conference of Soil Science Society of Nigeria (SSSN), 15-19 Jul. 2019, University of Agriculture, Makurdi, Benue State, Nigeria
Onah, C.J., Nnadi, A.L., Eyibio, N.U., Obi, J.O., Orah, A.I., Amuji, C.F., Obalum, S.E., 2023. Off-season heavy application of poultry manure to droughty-acid soils under heavily protective organic mulch later burnt to ash improves their productivity. West African Journal of Applied Ecology 31(1): 23-36
Onunwa, A.O., Nwite, J.C., Igwe, C.A., Okebalama, C.B., Udegbunam, O.N., 2016. Performance evaluation of tillage methods and organic amendments on selected soil properties and maize-cowpea intercrop in Ultisol, Southeastern Nigeria. International Journal of Agriculture and Biosciences 5(5): 306-311
Opala, P.A., Okalebo, J.R., Othieno, C.O., 2012. Effects of organic and inorganic materials on soil acidity and phosphorus availability in a soil incubation study. International Scholarly Research Notices, Volume 2012, Article ID 597216.
https://doi.org/10.5402/2012/597216
Rayne, N. and Aula, L., 2020. Livestock manure and the impacts on soil health: A review. Soil Systems. (4): 64.
https://doi.org/10.3390/soilsystems4040064
Sheppard, J., Hoyle, F., Murphy, D., 2022. Fact sheets: water repellency. Accessed 08 April 2022, from https://soilquality.org.au/factsheets/water-repellency
Sparks, D.L., (Ed) 1996. Methods of Soil Analysis Part 3: Chemical Methods. Soil Science Society of America (SSSA), Inc. Madison, WI
Suja, G. and Sreekkumar, J., 2014. Implications of organic management on yield, tuber quality and soil health in yams in the humid tropics. International Journal of Plant Production 8(3): 291-310
Uzoh, I.M., Obalum, S.E., Ene, J., 2015. Mineralization rate constants, half-lives and effects of two organic amendments on maize yield and carbon-nitrogen status of loamy Ultisol in southeastern Nigeria. Agro-Science 14(3): 35-40.
http://dx.doi.org/10.4314/as.v14i3.7
Wanniarachchi, D., Cheema, M., Thomas, R., Kavanagh, V., Galagedara, L., 2019. Impacts of soil amendments on the hydraulic conductivity of Boreal Agricultural Podzols. Agriculture 9(6): 133. https://doi.org/10.3390/agriculture9060133
Yang, X., Chen, X., Yang, X., 2019. Effect of organic matter on phosphorus adsorption and desorption in a black soil from Northeast China. Soil and Tillage Research 187: 85-91. https://doi.org/10.1016/j.still.2018.11.016
Yu, W., Ding, X., Xue, S., Li, S., Liao, X., Wang, R., 2013. Effects of organic-matter application on phosphorus adsorption of three soil parent materials. Journal of Soil Science and Plant Nutrition 13(4): 1003-1017.
https://doi.org/10.4067/S0718-95162013005000079
Zhou, M., Liu, C., Wang, J., Meng, Q., Yuan, Y., Ma, X., Liu, X., Zhu, Y., 2020. Soil aggregates stability and storage of soil organic carbon respond to cropping systems on black soils of Northeast China. Science Republic 10: 265.
https://doi.org/10.1038/s41598-019-57193-1