Dr. Charles Andrew Nyambane Onyari Publications

Publications

1. Kyalo, A.M., H. Mogaka, F.K. Kirimi, K. Kizito, S.N. Ndirangu, C.N. Onyari, L. Muriithi, O.N. Elvin, S.K. Mutungi, S. Kiprotich, M.M. Njiru and E.A. Kamau. (2025). Exploring Socio-Economic Characteristics on Adoption Intensity of Biochar Among Farming Households in Sub-Humid Regions of Western Kenya. Journal of Global Innovations in Agricultural Sciences 13(2) DOI: https://doi.org/10.22194/JGIAS/25.1608
2. Kiprotich, S., Mogaka, H., Ndirangu, S. N., & Onyari, C. N. (2023) Determinants of adoption and adoption intensity of intergrated soil fertility managemnt technologies among sorghum farmers in upper Eastern Kenya. Soil Use and Management.
3. C N Onyari (2022). Yield Assessment from Selected Growth Parameters of Maize Grown in Embu County, Kenya In Current Topics in Agricultural Sciences Vol. 8, 16 June 2022 , Page 94-100. https://doi.org/10.9734/bpi/ctas/v8/2238B
4. Judith N. K. Wafula, Fredrick N. Mugendi, Paul N. Nthakanio, Jeremiah O. Mosioma, Charles A.N. Onyari (2022). Effects of Variety, Spacing and Nitrogen Application on Chickpea (Cicer arietinum) Growth and Yield in Embu County, Kenya. Journal of Experimental Biology and Agricultural Sciences, 10(1) page 32 – 47.  ISSN No. 2320 – 8694
5. KIRIMI, F. K., Onyari, N. C., Njeru, L. K., & Mogaka, H. R. (2022). Extension-Market Linkages on Banana Commercialisation Among Smallholder Farmers in Meru Region, Kenya. Journal of Agricultural Extension, 26(1), 18-26.
6. Charles Nyambane Onyari and Alice Kosgei (2021). Overview of Nitrogen Use Efficiency in Enhancing Food Security in Kenya: Progress and Challenges. Proceedings of the International Conference On Technology And Innovation For Sustainable Development, Muranga University of Science and Technology. 3 rd- 5th November 2021.
7. Wafula, J. K., Njoka, F. M., Nthakanio, P. N., Mosioma, J. O., Mukono, S. T., & Onyari, C. A. (2021). Nodulation and protein content of selected chickpea varieties as impacted by spacing and n-fertiliser rates in Eastern Kenya. African Journal of Agricultural Research, 17(6), 882-895.
8. Kirimi FK, Onyari CN, Njeru LK and Mogaka HR (2021). Extension-Market Linkages on Banana commercialization Among Smallholder Farmers in Meru Region, Kenya. Journal of Agricultural Extension – in Press.
9. Kirimi FK, Onyari CN, Njeru LK and Mogaka HR (2021). Effects of on-farm testing on adoption of banana production technologies among smallholder farmers in Meru region, Kenya. Journal of Agribusiness development and emerging Economies, Emald Publishing Ltd, p.1-16
10. Wafula JK, Njoka FM, Nthakanio PN, Mosioma JO, Mukono ST and Onyari CAN (2021). Nodulation and protein content of selected chickpea varieties as impacted by spacing and N-fertiliser ratesin Eastern Kenya. African Journal of Agricultural Research, 17(6):882-895
11. Onkoba SO, Onyari CN, and Gichimu MB (2021). Productivity of selected cabbage varieties under varying drip irrigation schedules in Humic Nitosols of Embu County, Kenya. International Journal of Agronomy, Hindawi Volume 2021, Article ID 9978974, 7 pages.
12. Muriithi LN, Onyari CN, Mogaka HR, Gichimu BM, Gatumo GN and Kwena K (2021). Adoption determinants of adapted climate smart agriculture technologies among smallholder farmers in Machakos, Makueni and Kitui Counties, Kenya. Journal of Agricultural Extension, 25(2):75-85.
13. Kirimi FK, Onyari CN, Njeru LK and Mogaka HR (2021). Extension training for banana value addition among smallholder farmers in Meru and Tharaka-Nithi Counties, Kenya. African Journal of Agricultural Research, 17(4):690-696.
14. Kaloi FK, Isaboke H N, Onyari C N & Njeru L K. (2021). Determinants Influencing the Adoption of Rice Intensification System among Smallholders in Mwea Irrigation Scheme, Kenya. Advances in Agriculture, 2012: 1-8.
15. Kaloi FK, Isaboke H N, Onyari C N, & Njeru L K. (2020). Comparing productivity of rice under system of rice intensification and conventional flooding: A switching regression approach. African Journal of Agricultural Research, 16(10), 1355-1363.
16. GK Robert, CN Onyari & JG Mbaka (2020). Development of a Water Quality Assessment Index for the Chania River, Kenya. African Journal of Aquatic Science, 2020: 1–11.
17. Muchoka J. P., Mugendi, D. N., Njiruh P. N., Onyari C. N., Mbugua P. K. and Njeru E. M. (2020). Mycorrhiza co-association with Aspilia pruliseta and phosphorus uptake effects on growth of gadam sorghum in the semi-arid lower Eastern Kenya. Journal of Dryland agriculture, Vol. 6(5), pp. 46-53,
18. Muchoka J. P., Mugendi, D. N., Njiruh P. N., Onyari C. N., Mbugua P. K. and Njeru E. M. (2020). Arbuscular Mycorrhizal Fungi Colonization in the Rhizosphere of Aspilia pruliseta ext Schweif in the Semiarid Eastern Kenya. Air, Soil and Water Research, 13: 1–10.
19. W. Ndung’u, G. Mwithiga, C.N. Onyari, G. Muriithi, S.T. Mukono (2020). Evaluating the surface functional groups on banana leaf petioles and the resultant biochar for potential adsorbance. Jpournal of Materials and Environmental Science, 2:255-261.
20. Onyari C N, Kibe A M, & Mwonga SM (2017). Inter-seasonal effects on selected maturity parameters of DK8031 maizegrown under varying irrigation and nitrogen levels in Embu County, Kenya. Asian Journal of Agriculture 5(3):1-13.
21. Onyari C N, Kibe A M and Mwonga S M (2015). Growth Parameters of DK8031 Maize Variety as Affected by Varying Irrigation and Nitrogen Fertilizer Rates in Embu County, KenyaJournal of Environmental Science and Engineering A 4 (2015) 432-444.
22. Robert M. Ogeto, Patience Mshenga, Erick Cheruiyot and Charles N. Onyari (2013). Sorghum production for food security: A socio-economic analysis of sorghum production in Nakuru County, Kenya. African Journal of Agricultural Research, 8(47):6065-6067.
23. Robert M. Ogeto, Patience Mshenga, Erick Cheruiyot and Charles N. Onyari (2012). Influence of institutional factors on sorghum production in Nakuru County, Kenya. Journal of Agricultural Economics and Development, 1(6):130-137.
24. Onyari C.A.N., Ouma JP, and Kibe A.M. (2010). Effect of tillage method and sowing time on phenology, yield and yield components of chickpea (Cicer arietinum L.) under semi-arid conditions in Kenya. Journal of Applied Biological Sciences, 34:2165.
25. Kibe A.M., Onyari C.N., Ouma J.P. and Kariuki J.N. (2009). Inter-seasonal water use efficiency of chickpea grown in a semi-arid environment of Naivasha under varying tillage and sowing dates. Proceedings of Second Research week held at ARC, Egerton University.
26. M. Kibe and C.N. Onyari (2007). Production functions and their use in predicting biomass yield under varying tillage and sowing dates in Naivasha, Kenya. Agricultural Journal 2(4):5114-519.

Supervision (Level and Title of Thesis/Proposal)

1. PhD (Completed) - Agricultural Extension Services On Banana Value Chain Development Among Smallholder Farmers In Meru And Tharaka–Nithi Counties, Kenya
2. PhD (Ongoing) – Assessing The Performance Of Irrigation Schemes: Case of Bura Irrigation Scheme, Kenya
3. PhD (Concept Development) – Effects of Devolution of Agriculture on Household Food Security Among Smallholder Farmers in Embu County, Kenya
4. MSc (Completed) – Treatment of Institutional Grey Water for Reuse: Case of University of Embu
5. MSc (Completed) –Economics of the Rice Intensification on Smallholders’ Rice Productivity in Mwea Irrigation Scheme, Kenya
6. MSc (Completed) – Productivity and Profitability of Selected Cabbage Varieties Under Varying Drip Irrigation Schedules in Humic Nitisols of Embu County
7. MSc (Completed) – Adoption of Selected Climate Smart Agricultural Technologies Among Smallholder Farmers in Lower Eastern Kenya
8. MSc (Completed) – Application of Water Quality Index to Assess Water Quality in River Chania, Kiambu County, Kenya
9. MSc (Thesis Corrections) – Adoption, Productivity and Returns on Investment of Integrated Soil Fertility Management Technologies Among Sorghum Farmers in Tharaka-Nithi County, Kenya
10. MSc (Data Analysis / Thesis Drafting) – Technical Efficiency of Conventional and Hybrid Rice Varieties of Smallholder Rice Farmers Under System of Rice Intensification and Conventional Flooding in Mwea, Kenya
11. MSc (Ongoing) – Adoption and Utilization of Brachiaria Fodder (Urochloa Brizantha) Among Smallholder Dairy Farms In Embu County
12. MSc (Ongoing) – Land Use Effects On Residual NPK and Dams’ Water Quality in Eastern Kenya: Case of the University of Embu, Embu County
13. MSc (Proposal Development) – Assessment of Drought Effects and Coping Strategies For Livestock Production in Machakos Sub County, Kenya

Projects Participated

1. AgriFoSe – Agricultural and Food Security Project supported by the World Bank through the International Livestock Research Institute. Formulating Implementable Policy From Research Work For Increased Food Productivity
2. TaNRMP – Tana North Resource Management Project supported by World Bank through Water Resources Management Authority (WaRMA, now WRA) /State Department of Water and Irrigation: Watershed Management Through Water Resources Users’ Association (Embu County, Central Kenya Region)
3. KSAP – Kenya Smart Agriculture Project supported by World Bank through Kenya Agriculture and Livestock Research Organization (KALRO): Sorghum-Pigeon Pea Intercrop Effects on Soil Fertility (haraka-Nithi County)
4. KSAP – Kenya Smart Agriculture Project supported by World Bank through Kenya Agriculture and Livestock Research Organization (KALRO): Adoption and Coping Strategies by Livestock Famers in Lower Eastern (Machakos County)