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DR JUSTIN NYAGA PUBLICATIONS

Publications in Scientific journals

  • Leiririo, J.L., Karuri, H., & Nyaga, J. M. (2022). Nematode-based soil food web condition in mung bean under semi-arid conditions, Journal of Agriculture and Food Research. Journal of Agriculture and Food Research, 100465. https://doi.org/10.1016/j.jafr.2022.100465
  • Kemboi,B.,Karuri,H., Nyaga,J. & Kingsbury,A.(2022).Vertical Distribution of Plant-Parasitic Nematodes in Sweet Potato. Journal of Nematology,54(1) -. https://doi.org/10.2478/jofnem-2022-0025
  • Riungu, P. M., Nyaga, J. M., Githaiga, M. N., & Kairo, J. G. (2022). Value Chain and Sustainability of Mangrove Wood Harvesting in Lamu, Kenya. Trees, Forests and People, 100322. https://doi.org/10.1016/j.tfp.2022.100322
  • Koskei EC., Kotut K., Nyaga J. & Oduor SO., (2019). Temporal variation in physico-chemical characteristics, phytoplankton composition and biomass in Lake Solai, Kenya. International Journal of Aquatic Science. Vol 10 issue 2, 101-111.
  • Onipchenko VG., Kopylova NA., Kipkeev AM., Elumeeva TG., Azovsky A., Dudov SV., & Nyaga JM. (2019). Low floristic richness of afro‑alpine vegetation of Mount Kenya is related to its small area. Alpine Botany. https://doi.org/10.1007/s00035-019-00229-z
  • Namu J., A.  Alakonya, H.  Karuri, J.  Nyaga, J.  Masanga and E. Njeri (2019).  Response of Selected Kenyan Rice Cultivars to Infection by Root Knot Nematode (Meloidogyne incognita). Journal of Crop Science and Biotechnology  22: 47-54. https://doi.org/10.1007/s12892-017-0101-0.
  • Namu J.,   H. Karuri, A. Alakonya, Nyaga, J.M, and E. Njeri (2018).  Distribution of parasitic nematodes in Kenyan rice fields and their relation to edaphic factors, rainfall and temperature. Tropical Plant Pathology https://doi.org/10.1007/s40858-017-0194-9
  • Nyaga, J.M, Neff, J.C, Cramer, M.D. 2015. The Contribution of Occult Precipitation to NutrientDeposition on the West Coast of South Africa. PLoS ONE 10(5): e0126225. doi:10.1371/journal.pone.0126225
  • Nyaga, J.M, Cramer, M.D, Neff, J.C. 2013. Nutritional contributions of marine aerosol deposition to coastal strandveld fynbos in west coast South Africa. Atmospheric Environment 81, 625-632
  • Skelton, R.P, Midgley, J.J, Nyaga, J.M, Johnson, S.D, Cramer, M. D. 2012. Is leaf pubescence of Cape Proteaceae a xeromorphic or radiation-protective trait?Australian Journal of Botany, 60, 104-113
  • Musil, C, Nyaga, J.M, Maphangwa, K, Raitt, L. 2010. Responses of dwarf succulent plants, lichens, and soils to experimental climate warming in an arid South African ecosystem. In: Schmiedel, U., Jürgens, N. [Eds.]: Biodiversity in southern Africa. Volume 2: Patterns and processes at regional scale: pp. 246-250, Klaus Hess Publishers, Göttingen& Windhoek.

Presentations at scientific meetings

  • Nyaga, J.M, J.C, Cramer, M.D, Ripley, B. 2015. The role of transpiration-driven mass-flow on growth and nutrient delivery to roots of C3 and C4 crops, and consequences of changing atmospheric CO2 concentration. Oral presentation. Climate Impacts Research Capacity and Learning Enhancement workshop, 2015. Nairobi, Kenya. 4 – 8 February 2015.
  • Nyaga, J.M,Musil, C. 2010.A comparison of soil CO2 effluxes predicted by mechanistic and statistical models in an arid South African ecosystem. Oral presentation. The International Conference on Climate, Sustainability and Development in Semi-Arid Regions, 2010. Nairobi, Kenya. 8 – 12 June 2010.
  • Nyaga, J.M,Musil, C. Raitt, L. 2009. Empirical and theoretical based model predictions of respiration in different soils of an arid South African ecosystem: impact of climate warming. Poster presentation.The Diversitas International Conference 2009. Cape Town, South Africa. 14-16 October 2009
  • Nyaga, J.M,Musil, C. Raitt, L. 2009.A comparison of empirical and theoretical based model predictions of CO2 efflux in different soils of an arid South African ecosystem.Oral presentation.The Arid Zone Forum 2009.Graaff-Reinet (Eastern Cape, South Africa).  5 - 8 October 2009.
  • Nyaga, J.M. 2009.Emerging and feasible technologies for carbon sequestration. Oral presentation. Emerging Technologies Workshop. Amanzintaba resort, Bronchospruit, Gauteng-South Africa. 19 - 20 September, 2009
  • Nyaga, J.M,Musil, C. Raitt, L. 2009. A comparison of empirical and theoretical based soil respiration models.Poster presentation.The Fynbos forum 2009.Bredasdorp (Western Cape-South Africa).4th - 7th August 2009.
  • Nyaga, J.M,Musil, C. Raitt, L. 2009. Estimating soil respiration responses to climate warming in an arid South African ecosystem. Oral presentation.5th EGU Alexander von Humboldt International Conference. University of Cape Town, South Africa. 12th - 16th January 2009.
  • Nyaga, J.M,Musil, C. Raitt, L. 2008. Effects of experimental climate manipulations on soil and vegetation dynamics in the South African succulent karoo biome. Oral and Poster presentations. Biota International Congress. Spier, Stellenbosch. 29th September to 3rd October 2008
  • Nyaga, J.M,Musil, C. Raitt, L. 2008. Impacts of fog and dew on soil moisture, respiration and nutrients recycling in the succulent Karoo biome, South Africa. Poster presentation. 51st Annual International Association of Vegetation Science (IAVS) Symposium. Stellenbosch University, South Africa. 7th to 12th September 2008
  • Nyaga, J.M,Musil, C. Raitt, L. 2008. The role of fog and dew as moisture sources on soil respiration and nutrients recycling in the succulent Karoo biome. Poster presentation. The Interface (Fynbos forum and Arid zone forum) 2008. Oudtshoorn (Western Cape-south Africa). 3rd - 7th August 2008

Post graduate students under supervision

  • Samuel John Namu. PhD Student.
    Research topic: Assessment of plant parasitic nematodes associated with Kenyan rice and immunopathological response of rice genotypes to Root Knot Nematode infection. University of registration: University of Embu.
  • Moses KathuriNjeru. PhD Student.
    Research topic: Sustainable agricultural practices and factors influencing their adoption among households in Embu county, Kenya.
    University of registration:Chuka University.
  • Martha Kamunyu. MSc Student.
    Research topic:The effects of anthropogenic activities on land degradation in Turima location of Tharaka South district in TharakaNithi County.
    University of registration:Chuka University.
  • Julius G. Mwebia Mugambi. MSc Student.
    Research topic:The effect of anthropogenic activities on the soil characteristics in Meru south district and their mitigation strategies.
    University of registration:Chuka University.
  • Sammy Mwanzia Musyoka. MSc Student.
    Research topic:Composition, Growth rate and oil production potential of Phytoplankton in lake Naivasha and water reservoirs in Embu University College.
    University of registration:University of Embu.
  • George Ogunda. MSc Student.
    Research topic:The efficacy of municipal sewerage treatment in purification of domestic effluent at Kipevu in Mombasa.
    University of registration:Chuka University.
  • Quentin Andrew Mwakilanga Ngati. MSc Student.
    Research topic:Non point sources of river pollution in Upper Tanariver catchment: a case study of river Rupingazi, Embu county.
    University of Registration:Chuka University.
  • Samuel Kivuti Nyaga. MSc Student.
    Research topic: Effects of climate change adaptation on food security in Mavuria ward, Embu County in Kenya.
    University of registration:Chuka University.