Dr. George Ouma
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Dr. George Ouma

Professor
Jaramogi Oginga Odinga University of Science and Technology, Kenya

Highest Degree
Ph.D. in Horticulture from Mississippi State University, USA

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Biography

Dr. George Ouma is currently working as Professor at Bondo University College, Kenya. He obtained his PhD in Horticulture from Mississippi State University USA, MSc in Agronomy from University of Nairobi. In past he worked as Research Officer in Kenya Agriculture Research Institute, Lecturer, Senior Lecturer, and Associate Professor at Maseno University and Bondo University College. His research activities include Effect of leaf defoliation on the yield of apple trees, the effect of N, P. K. fertilization on the yield of plums apples and pears, the effect of different propagation techniques on the yield and growth of apples, plums and pears, the effect of different levels of N, P. K. fertilization on the yield of onion, kales, tomatoes, cabbages, the effect of different weed control methods on the yield of onions, tomatoes and the brassicas, the different pruning methods on the yield of apples, pears peaches and plums, factors affecting seed production of various exotic vegetables. He is member of following different societies, International Society for Horticultural Science, Federation of Plant Physiology Society, International Dwarf tree Association, American Society for Horticultural Science, Citriculture Society, of Canadian Society for Horticultural Science, Horticultural Association of Kenya, Australian Society for Horticultural Science. He has published 136 research articles in journals as author/co-author. He is also serving as reviewer and editorial member in many national and international journals. He also attended number of workshops and conferences. Dr .George Ouma received honors include Best student in Academic work, Best Physics Student, M.Sc Scholarship-DAAD-University of Nairobi, Ph.D Scholarship, Sustainable Agriculture Award. He supervised 26 undergraduate students 10 BSc students, 16 MSc students, 1 PhD student, 2 MSc and 1 PhD student currently in his supervision.

Area of Interest:

Plant and Soil Sciences
100%
Horticulture
62%
Physiology
90%
Applied Horticulture
75%
Crop Management
55%

Research Publications in Numbers

Books
0
Chapters
0
Articles
0
Abstracts
0

Selected Publications

  1. Kaoga, J., G. Ouma and P. Abuom, 2013. The effects of farm pesticides on water bird numbers in lake Naivasha, Kenya. J. Environ. Water Resour., 2: 203-209.
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  2. Ouma, G., 2012. Fruit thinning with specific reference to Citrus species: A review. Agric. Biol. J. North Am., 3: 175-191.
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  3. Ogutu, M.O., R. Muasya and G. Ouma, 2012. Effects of nitrogen fertilizer applications in a bean-maize based intercropping systems and locations on seed quality of common bean in Western Kenya. Int. Res. J. Agric. Sci. Soil Sci., 2: 481-492.
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  4. Ogutu, M.O., R. Muasya and G. Ouma, 2012. Effects of cropping system, planting location and inorganic nitrogen on quality of bean seed in Western Kenya. Global Adv. Res. J. Agric. Sci., 1: 261-274.
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  5. Ogutu, M.O., J.O. Owuoche, R. Muasya and G. Ouma, 2012. Effects of inter-specific interaction of nitrogen fertilizer and bean-maize cropping systems on quality of bean seed in Western Kenya. Agric. Biol. J. North Am., 3: 154-168.
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  6. Ogutu, M.O., G. Ouma, H. Ogola, J.N. Okech and N. Kidula, 2012. Rainfed rice-legume based cropping systems for sustainable food security and soil fertility improvement in Western Kenya. J. Agric. Biol. Sci., 7: 709-720.
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  7. Owino, D.O. and G. Ouma, 2011. Effect of potassium priming on papaya (Carica papaya var. kamiya). J. Anim. Plant Sci., 2: 1418-1428.
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  8. Owino, D.O. and G. Ouma, 2011. Effect of potassium priming on papaya (Carica papaya 'kamiya') seed germination and seedling growth. Acta Horticulturae, 911: 319-322.
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  9. Muriithi, K. and G. Ouma, 2011. The effect of sugar and hypochlorite on the vaselife of cut roses and carnations. J. Anim. Plant Sci., 2: 1394-1397.
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  10. Luvaha, E., G.W. Netondo and G. Ouma, 2011. Effect of water deficit on the growth, gas exchange and chlorophyll content of mango (Mangifera indica) rootstock seedlings. Acta Horticulturae, 911: 375-382.
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  11. Jeruto, P., C. Mutai, G. Ouma and C. Lukhoba, 2011. An inventory of medicinal plants that the people of Nandi use to treat malaria. J. Anim. Plant Sci., 9: 1192-1200.
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  12. Jeruto, P., C. Mutai, C. Lukhoba and G. Ouma, 2011. Phytochemical constituents of some medicinal plants used by the Nandis of South Nandi district, Kenya. J. Anim. Plant Sci., 9: 1201-1210.
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  13. Ouma, G. and P. Jeruto, 2010. Sustainable horticultural crop production through intercropping: The case of fruits and vegetable crops: A review. Agric. Biol. J. North Am., 1: 1098-1105.
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  14. Okuto, J.L. and G. Ouma, 2010. Provenance variation of photosynthesis of seedlings of java plum (S. cuminii) in Western Kenya. Agric. Biol. J. North Am., 1: 1260-1263.
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  15. Jeruto, P., C. Mutai, G. Ouma, C. Lukhoba, R.L. Nyamaka and S.D. Manani, 2010. Ethnobotanical survey and propagation of some endangered medicinal plants from South Nandi district of Kenya. J. Anim. Plant Sci., 8: 1016-1043.
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  16. Fedha, M.S., M.A. Mwasaru, C.K. Njoroge, N.O. Ojijo and G. Ouma, 2010. Effect of drying on selected proximate composition of fresh and processed fruits and seeds of two pumpkin species. Agric. Biol. J. North Am., 1: 1299-1302.
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  17. Achieng, J.O., G. Ouma, G. Odhiambo and F. Muyekho, 2010. Effect of farmyard manure and inorganic fertilizers on maize production on Alfisols and Ultisols in Kakamega, Western Kenya. Agric. Biol. J. N. Am., 1: 430-439.
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  18. Achieng, J.O., G. Ouma, G. Odhiambo and F. Munyekho, 2010. Effect of Tithonia diversifolia (Hemsley) and inorganic fertilizers on maize yield on alfisols and ultisols of Western Kenya. Agric. Biol. J. North Am., 1: 740-747.
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  19. Ouma, G., 2009. Intercropping and its application to banana production in East Africa: A review. J. Plant Breed. Crop Sci., 1: 13-15.
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  20. Ouma, G., 2009. Effect of different container sizes and irrigation frequency on the growth and gas exchange characteristics of mango rootstock seedlings. Adv. Hortic. Sci., 23: 33-40.
  21. Okuto, J.L. and G. Ouma, 2009. Seed germination of java plum (Syzigium cumnii) in three provenances Western Kenya. Int. J. Plant Breed. Crop Sci., 1: 320-329.
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  22. Sikolia, S., E. Beck, J.I. Kinyamario, J.C. Onyango and G. Ouma, 2008. δ13 values of the Centrospermeae species and their ecological implications in the semi arid conditions. Int. J. Bot., 4: 421-429.
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  23. Pascaline, J., C. Lukhoba, G. Ouma and C. Mutai, 2008. Propagation of some endangered indigenous trees from the South Nandi district of Kenya using cheap, non-mist technology. J. Agric. Biol. Sci., 3: 1-6.
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  24. Ouma, G., 2008. Use of gibberellins to improve fruit set in pears after frost damage. J. Boil. Sci., 8: 213-216.
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  25. Ouma, G., 2008. Effects of forcing method and root pruning on the growth of budded 'Rough lemon' rootstock seedlings. Afr. J. Plant Sci. Biotechnol., 2: 103-106.
  26. Ouma, G., 2008. Effect of container size and irrigation frequency on the growth and gas exchange characteristics of avocado root stock seedlings. Int. J. Fruit Sci., 7: 50-53.
  27. Ouma, G., 2008. Challenges and approaches to sustainable citrus production in Kenya. Afr. J. Plant Sci. Biotechnol., 2: 49-51.
  28. Okeyo, A. and G. Ouma, 2008. Effect of washing and media on the germination of papaya seeds. J. Agric. Biol. Sci., 3: 8-12.
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  29. Musyimi, D.M., G.W. Netondo and G. Ouma, 2008. Salinity and temperature effects on CO2 assimilation in leaves of avocados. Am. J. Plant Physiol., 3: 40-49.
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  30. Luvaha, E., G.W. Netondo and G. Ouma, 2008. Effect of water deficit on the physiological and morphological characteristics of mango (Mangifera indica) rootstock seedlings. Am. J. Plant Physiol., 3: 1-15.
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  31. Jeruto, P., C. Lukhoba, G. Ouma, D. Otieno and C. Mutai, 2008. Herbal treatments in Aldai and Kaptumo divisions in Nandi district, Rift Valley province, Kenya. Afr. Tradit. Compliment. Altern. Med., 5: 103-105.
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  32. Jeruto, P., C. Lukhoba, G. Ouma, D. Otieno and C. Mutai, 2008. An ethnobotanical study of medicinal plants used by the Nandi people in Kenya. J. Ethnopharmacol., 116: 370-376.
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  33. Ouma, G., 2007. Morphological and physiological parameters of avocado (Persea americana) rootstock seedlings as affected by different container sizes and different levels of irrigation frequency. J. Boil. Sci., 7: 833-840.
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  34. Ouma, G., 2007. Growth parameters, photosynthesis, stomatal conductance and chlorophyll content of avocado (Persea americana) rootstock seedlings as affected by different container sizes and different levels of irrigation frequency. J. Agric. Biol. Sci., 2: 23-34.
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  35. Ouma, G., 2007. Effect of different container sizes and irrigation frequency on the morphological and physiological characteristics of mango (Mangifera indica) rootstock seedlings. Int. J. Bot., 3: 260-268.
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  36. Ouma, G., 2007. Chemical and non-chemical thinning methods in apple (Malus domestica Borkh). J. Agric. Biol. Sci., 2: 7-11.
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  37. Ouma, G., 2007. Chemical and defoliation effects on fruitset of apple (Malus domestica). Asian J. Plant Sci., 6: 1155-1157.
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  38. Musyimi, D.M., G.W. Netondo and G. Ouma, 2007. Growth of avocado plants under saline conditions. Int. J. Fruit Sci., 7: 59-75.
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  39. Musyimi, D.M., G.W. Netondo and G. Ouma, 2007. Effects of salinity on growth and photosynthesis of avocado seedlings. Int. J. Bot., 3: 78-84.
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  40. Musyimi, D.M., G.W. Netondo and G. Ouma, 2007. Effects of salinity on gas exchange and nutrients uptake in avocados. J. Boil. Sci., 7: 496-505.
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  41. Luvaha, E., G.W. Netondo and G. Ouma, 2007. Responses of mango (Mangifera indica L.) root stock seedlings to water stress. Int. J. Bot., 3: 373-378.
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  42. Luvaha, E., G.W. Netondo and G. Ouma, 2007. Physiological responses of mango (Mangifera indica) rootstock seedlings to water stress. J. Agric. Biol. Sci., 2: 6-10.
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  43. Ouma, G., 2006. Growth responses of 'Rough lemon' (Citrus limon L.) rootstock seedlings to different container sizes and nitrogen levels. Agricultura Tropica Subtropica, 39: 183-189.
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  44. Ouma, G., 2005. Root confinement and irrigation frequency affect growth of rough Lemon (C. sinensis) rootstock seedlings. Fruits J., 60: 195-202.
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  45. Ouma, G., 2004. Chemical and non-chemical thinning studies in apple. Discovery Innov. J., 17: 50-55.
  46. Ouma, G., 2003. Effects of postharvest heat treatment on the chilling of avocado. Maseno J. Arts Educ. Social Sci., 4: 131-138.
  47. Ouma, G. and F. Matta, 2003. The effects of Accel and Carbryl on fruit set and fruit quality of three apple cultivars. East Afr. Agric. For. J., 68: 183-190.
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  48. Ouma, G. and F. Matta, 2003. Response of several apple tree cultivars to chemical thinner sprays. Fruits, 58: 275-281.
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  49. Ouma, G. and F. Matta, 2001. Effect of bioregulators on apple yield and quality attributes. J. Agric. Sci. Technol., 3: 41-52.
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  50. Ouma, G. and A. Rice, 2001. Effects of naphthalene acetic acid, carbaryl and accel on thinning of apples. J. Agric. Sci. Technol., 3: 45-56.
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  51. Ouma, G. and F. Matta, 2000. Effect of accel and carbaryl on fruit set and fruit characteristics of apple. Maseno J. Educ. Arts Sci., 3: 103-113.
  52. Ouma, G. and F. Matta, 1999. Effects of accel and carbaryl on apple tree nutrition and fruit yield. J. Agric. Sci. Technol., 2: 8-21.
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