Dr. Haggai Onyango Ndukhu

KEY RESEARCH PROJECTS

1. Funded by National Research Fund (NRF) for the 2016-17 cycle. Proposal title: Enhancing the Contribution of Moringa oleifera (Lamarck) to Soil Health, Climate Resilience and Community Livelihoods in Kenya
2. 2012-2017: Growth and Productivity in Organic Value Chains Project. A DANIDA funded project atUniversity of Nairobi, Kenya
3. 2011: Funded by the National Commission Science, Technology and Innovation for “crop performance and soil nutrient dynamics under different organic based cropping systems in central Kenya’

RECENT JOURNAL PUBLICATIONS

1. Mbaka, F.K; Ndukhu, H.O and Oloo-Abucheli G.O. (2022). Use of Cost-Effective Biofertilizers Interventions for Enhanced food Security and Soil Management Amidst Covid-19 Crisis. Review. International Journal of Environment, Agriculture and Biotechnology Vol-7, Issue-2
2. Mukambula Sioma, K. Gathungu Geofrey, O. NdukhuHaggai (2022). Grain Yield and Economic Benefits of Soybean as Affected by Integration of Rhizobium inoculation and Phosphorus Application in Chukka Sub-County, Kenya. International Journal of Plant and Soil Science. IJPSS/86682
3. F. K. Mbaka, H. O. Ndukhu, G. O. Oloo-Abucheli and C. T. Kiplanga, (2022). Effect of Rhizobium Inoculation and Phosphate Rock Fertilizer Application on Biomass Production, Nutrient use Efficiency and Yield Parameters of Green Gram (Vigna radiata) Asian Journal of Agricultural and Horticultural Research 9(2): 47-59.
4. Mbaka, F. K., Oloo-abucheli, G. O., Njoroge, P. K., & Ndukhu, H. O. (2021). Influence of Rhizobium Inoculation and Phosphate Rock Fertilizer Application on Growth and Yield Components of Green gram (Vigna radiata) in Tharaka-Nithi County, Kenya. Asian Journal of Research in Crop Science, 61-72.
5. Mbaka, F. K., Ndukhu, H. O., & Oloo-Abucheli, G. O. (2020). Response of Soil Chemical Properties to Rhizobium and Rock Phosphate Fertilizer Application under Green-Grams in Tharaka Nithi County, Kenya. Asian Journal of Soil Science and Plant Nutrition, 43-52.
6. Gichaba, V. M., Ndukhu, H. O. G., & Muraya, M. (2020). Effect of Goat Manure-Based Vermicompost on Soil Chemical Properties under Garlic Production in the Upper Eastern Region of Kenya. AFRICAN JOURNAL OF SCIENCE, TECHNOLOGY AND ENGINEERING (AJSTE), 1(1), 127-145.
7. Mulambula, S., Gathungu, G. K., Ndukhu, H. O., & Ogolla, F. O. 2019. Effects of Integrated Application of Rhizobium and Phosphatic Fertilizer on Growth, Nodulation and Yields of Soybean in Meru South Kenya.
8. Ndukhu, O.H., Wahome, G.R & Jensen, H.H. (2019). Effect of Applying Organic Amendments and Chickpea Integration on Soil Chemical Properties in Different Cropping Systems in Central Kenya. Journal of Agricultural Science Vol. 10, No. 12, p215 • DOI:10.5539/jas.v10n12p215
9. Gichaba, V. M., Ndukhu, H. O., Muraya, M., Odilla, G. A., Ogolla, F. O, (2019). Preparation and Evaluation of Goat Manure-Based Vermicompost for Organic Garlic Production in Manyatta sub-county, Kenya. International Journal of Environment, Agriculture and Biotechnology Vol-5, Issue-1, https://dx.doi.org/10.22161/ijeab.51.7 ISSN: 2456-1878
10. Mulambula. S, Gathungu G. K, Ndukhu H.O. and Ogolla F.O. (2019). Integrated Effect of Rhizobium Inoculation and Phosphorus Application on Tissue Content, Symbiotic and Phosphorus use Efficiency in Soybean Production. International Journal of Environment, Agriculture and Biotechnology (IJEAB) Vol-4, Issue-5 ISSN: 2456-1878https://dx.doi.org/10.22161/ijeab.45.28
11. Kirimi, I.M., Munyiri, S.W. and Ndukhu, H.O. (2019). Optimizing Maize Yield and Economic Returns through Soil Moisture Conservation under Legume Intercrop. Journal of Environmental Sustainability Advancement Research vol. 5:1-10
12. Ndukhu, O. H., & Wahome, G. R. (2018). Modelling Nutrient Dynamics and Maize Yields under Different Cropping Systems and Organic Amendments Using APSIM in Central Kenya. International Journal of Plant & Soil Science, 1-16
13. O. H. Ndukhu, N. R. Onwonga, G. R. Wahome, G. Kironchi and H. H. Jensen, 2017. Effect of Integrating Chickpea and Organic Amendments on Yield and Quality Attributes of Tomato and Maize in Central Kenya. Journal of Agriculture and Ecology Research International 12 (4): 1-22.
14. O. H. Ndukhu, N. R. Onwonga, G. R. Wahome, G. Kironchi and H. H. Jensen, 2016. Assessment of Organic Farmers’ Knowledge and Adaptation Strategies to Climate Change and Variability in Central Kenya. British Journal of Applied Science & Technology17 (6): 1-22.
15. Ndukhu, H.O., Wahome, G.R & Jensen, H.H. (2019). Effect of Applying Organic Amendments and Chickpea Integration on Soil Chemical Properties in Different Cropping Systems in Central Kenya. Journal of Agricultural Science Vol. 10, No. 12, p. 215 DOI:10.5539/jas.v10n12p215
16. Mulambula, S, Gathungu G. K, Ndukhu H. O. and Ogolla F.O. (2019). Integrated Effect of Rhizobium Inoculation and Phosphorus Application on Tissue Content, Symbiotic and Phosphorus use Efficiency in Soybean Production. International Journal of Environment, Agriculture and Biotechnology, Vol-4, Issue5 ISSN: 2456-1878https://dx.doi.org/10.22161/ijeab.45.28
17. Ndukhu, H.O., & Wahome, G. R. (2018). Modelling Nutrient Dynamics and Maize Yields under Different Cropping Systems and Organic Amendments Using APSIM in Central Kenya. International Journal of Plant & Soil Science, 1-16.
18. Ndukhu, H.O., N. R. Onwonga, G. R. Wahome, G. Kironchi and H. H. Jensen, 2017. Effect of Integrating Chickpea and Organic Amendments on Yield and Quality Attributes of Tomato and Maize in Central Kenya. Journal of Agriculture and Ecology Research International 12 (4): 1-22.
19. Ndukhu, H.O., N. R. Onwonga, G. R. Wahome, G. Kironchi and H. H. Jensen, 2016. Assessment of Organic Farmers’ Knowledge and Adaptation Strategies to Climate Change and Variability in Central Kenya. British Journal of Applied Science & Technology17 (6): 1-22.
20. Ndukhu, H.O., Onwonga, R., Genga, Q., Wahome, G. and Henning, J. 2013. Climate change and variability: Experiences, coping and adaptation strategies among the smallholder organic vegetable farmers in Central Kenya. International newsletter from ICROFS.orbit.dtu.dk
21. Karanja, N., Mutua, G. K., Ayuke, F., Ndukhu, H.O. and Kimenju, J. W. (2011). Nematode Diversity and the Effects of Bacillus and Rhizobium on the Management of Plant Parasitic Nematodes in Common Bean. URL: http://hdl.handle.net/11295/65006 University of Nairobi Digital Repository
22. Mutua, G.K., Karanja, N.K., Ayuke, F.O., Ndukhu, H.O. and Kimenju, J.W., (2011). The potential of Bacillus subtilis and Rhizobium leguminosarium in controlling plant parasitic nematodes in farmers’ fields. African Crop Science Conference Proceedings, 10:207-203. Chuka University Academic Staff Database © 2020 Page 41 of 460

BOOK CHAPTERS
1. Onwonga R, Sibuga KP, Ndukhu, H. O, Sigsgaard L, Saria A, Shechambo L, Caceres MM, Chepkoech C, Genga Q, Wahome R, Halberg N, and Høgh‐Jensen H. ‘Supporting smallholder farmers of East Africa in Organic Crop Cultivation’ (Chapter in Improving organic crop cultivation (Ed. Prof. Ulrich Köpke),Burleigh Dodds Science Publishing) https://www.bookdepository.com/Improving‐Organic‐Crop‐ Cultivation‐Ulrich‐Kopke/981786761842
2. Ndukhu, O.H., Wahome, G.R & Jensen, H.H. Effect of Applying Organic Amendments and Chickpea Integration on Soil Chemical Properties in Different Cropping Systems in Central Kenya (Chapter in Research and Development in Agricultural Sciences Book)
3. F. K. Mbaka, G. O. Oloo-abucheli and H. O. Ndukhu. Selected Growth and Yield Parameters of Green Gram (Vigna radiata) under Rhizobium Inoculation and Phosphate Rock Fertilizer Application. DOI: 10.9734/bpi/ctas/v7/2705E. Print ISBN: 978-93-5547- 521-3, eBook ISBN: 978-93-5547-522-0

4. Onwonga R, Sibuga KP, Ndukhu, H.O, Sigsgaard L, Saria A, Shechambo L, Caceres MM, Chepkoech C, Genga Q, Wahome R, Halberg N, and Høgh‐Jensen H. ‘Supporting smallholder farmers of East Africa in Organic Crop Cultivation’ (Chapter in Improving organic crop cultivation (Ed. Prof. Ulrich Köpke),Burleigh Dodds Science Publishing) https://www.bookdepository.com/Improving‐Organic‐Crop‐Cultivation‐Ulrich‐Kopke/981786761842

RESEARCH INTEREST
1. Innovative, Comprehensive Approaches for Improving Local Food Systems towards Healthy Diet inAfrica and for Global Export
2. Soil Suitability survey for agricultural crops productivity using GIS and Remote Sensing,
3. Crop growth and Climate Change and variability modeling using APSIM, AquaCrop, ETo calculator, MonQI, Century, DSSAT.

POSTGRADUATE SUPERVISED TOPICS
1. Effect of Rhizobium inoculation and phosphorus application on soybean growth and yield
2. Effect of goat manure based vermicompost on soil chemical properties, growth and yield of garlic (Allium sativum L.) in mount Kenya region
3. Performance and soil moisture retention under inoculated cowpeas intercrop in lower Eastern Kenya
4. Effects of ascorbic and humic acid foliar spraying and nitrogen fertilizer management on yield and yield components of Quinoa (Chenopodium Quinoa)
5. Dynamics of Rhizobium Inoculation and Rock Phosphate Fertilizer Application on Soil Fertility and Performance of Green-grams in Eastern Kenya
6. Isolation and characterization of Aflatoxin in soils of lower eastern Kenya
7. Correlation of soil and maize grain Aflatoxin levels in lower Eastern Kenya
8. Agrochemical information access and utilization among small-scale farmers of Chuka Subcounty, Kenya

Students Supervision

COMPLETED MSc
i. Felister Kemunto Mbaka, MSc Student, NM16/35760/18, Chuka University. ‘Dynamics of Rhizobium Inoculation and Rock Phosphate Fertilizer Application on Soil Fertility and Performance of Green-grams in Eastern Kenya’
ii. Sioma Mulambula, MSc Student, Reg No.: NM17/22614/16, Chuka University. ‘Effect of Rhizobium Inoculation and Phosphorus Application on Soybean Growth And Yield’
iii. Vincent Makini Gichaba, MSc Student, Reg No.:NM17/22615/16, Chuka University. ‘Effect of Goat Manure Based Vermicompost on Soil Chemical Properties, Growth and Yield of Garlic (Allium Sativum L.) in Mount Kenya Region’
iv. Ian Mwenda Kirimi, MSc Student, Reg No.: NM17/20139/17, Chuka University. ‘Maize Performance and Soil Moisture Retention under Inoculated Cowpeas Intercrop in Lower Eastern Kenya’

ONGOING Ph.D
i. Felister Kemunto Mbaka, Ph.D Student, ND16/51329/21, Chuka University. ‘Validation of Rhizobium Mycorrizae and Rock Phosphate Fertilizers for Climate-Proofing the Sorghum and Cowpea Value Chains in Eastern Kenya’
ii. Abasi Edna Andeyo, Ph.D Student, NDT17/00843/20, Tharaka University College, Modelling Climate Change on Soil Nutrient Dynamics and Soil Amendments under Maize in Tharaka-Nithi County, Kenya’.

ONGOING MSc.
i. Muthinja, Fridah, MSc Student, NM17/29142/17, Chuka University. ‘Effects of Ascorbic and Humic Acid Foliar Spraying and Nitrogen Fertilizer Management on Yield and Yield Components of Quinoa (Chenopodium Quinoa)’
ii. Nyanchama Kerubo Marcella, MSc Student, NM16/35761/18, Chuka University. ‘Isolation and characterization of aflatoxin in soils of Central Kenya’
iii. Obwocha Blair Kevin, MSc Student, NM17/40001/19, Chuka University. ‘Response of maize to aflatoxin infected soils in Central Kenya’
iv. Irene Nyanchoka Osiamba, MSc Student, NM27/38546/18, Chuka University Agrochemical information access and utilization among small-scale farmers of Chuka Subcounty, Kenya
v. Yohane Faith Mutheu, MSc Student, NM16/45964/20, Chuka University. Performance of Cowpea as influenced by Farm Yard Manure and NPK application in Tharaka Nithi, Kenya
vi. Gikunda, Nthiga Robert, MSc Student, NM31/45904/21, Effects of Stubble Mulch on Growth and Yield of Cowpeas (Vigna unguiculata) in Tharaka Nithi, Kenya
vii. Kamau, Wairimu Agnes, MSc Student, NM30/45902/21, Chuka University: Assessment of soil fertility strategies by green gram farmers in Tharaka Nithi County

THESIS EXAMINATION
i. Florence Kadzo Kazungu, KG20/PU/36034/17. MSc Thesis Title: Growth and Yield Potential of Sorghum as Influenced by Manure and Inorganic Fertilizer Application in Post Mined Soils in Kwale County, Kenya. Pwani University, examined in April 2022
ii. Lubajo Bosco Wani A56/7830/2017; MSc thesis ‘Effect of Deficit Irrigation on Growth and Yield of Maize (Zea Mays) in Kiboko Research Station, Makueni County, Kenya’. University of Nairobi, Thesis examined in November 2021
iii. Ann Wanjue Ngari. MSc thesis “Effects of Rate and Time of Phosphorus Application and Planting Density on Growth and Yield of Ground Nuts (Arachis hypogaea)”. Chuka University, MSc thesis. Examined in October 2020
iv. Ogalo Oluoch Baraka, KU20/PU/36246/17. MSc Thesis Title: Effect of Salt Affected Borehole Irrigation Water on Soil Properties and Amaranthus (Amaranthus dubius Mart. Ex Thell) Growth in Kilifi and Kwale Counties. Pwani University, examined in September 2020
v. Deborah Ncuuri Kamunyu. MSc thesis “Effects of Livestock Manure on Growth, Yield and Quality of Okra (Abelmoschus esculentus L. Moench)”. Chuka University, MSc thesis. Examined in September 2020
vi. Njenga Kinene Joshua. MSc thesis “Efficacy of Neem, Tithonia and Tephrosia Leaf Extracts in Management of Root-Knot Nematodes in French Beans (Phaseolus vulgaris L.)”. Chuka University, MSc thesis. Examined in September 2019
vii. Nyakundi Osoro Naftaly, MSc thesis, “Effects of Agricultural Land Use Practices on Soil Carbon Stocks in Smallholder Farms in Embu County, Kenya”. Chuka University, MSc thesis. Examined in Sept 2019