Bio

DR.RICHARD OMBUI NYANKANGA

Dr Richard Ombui Nyankanga is a senior lecturer in the department of plant science and crop.
He is a horticulturalist by training with Bsc in Horticulture from Egerton University Msc and
PhD in horticulture from Cornell University U.S.A .He is currently serving as a manager field
station.
He teaches course in general agriculture, horticulture, physiology, for both undergraduate and
postgraduate students. He is also actively involved in the supervision of Msc. and PhD student.
His research interests are in Horticultural production and protection, farmer’s knowledge and

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Publications


2018

Gateri M.W., R. Nyankanga, Ambuko J, Muriuki AW.  2018.  Growth, Yield and Quality of Onion (Allium cepa L.) as Influenced by Nitrogen and Time of Topdressing. . International Journal of Plant & Soil Science . 23(32)( DOI: 10.9734/IJPSS/2018/42135):1-13.Growth, Yield and Quality of Onion (Allium cepa L.) as Influenced by Nitrogen and Time of Topdressing. .pdf

2017

Mageto E.K, D. Makumbi, and K. Njoroge, Nyankanga R.  2017.  Genetic analysis of early-maturing maize (Zea Mays L.) inbred lines under stress and nonstress conditions. Journal of Crop Improvement. DOI: 10.1080/15427528.2017.1315625(31:4, ):560-588.

2016

Ojwang J. D, R.O. Nyankanga, and J. Imungi, Olanya MO.  2016.  . Growth Parameters of vegetable pigeon pea varieties in Kenya. Horttechnology spotlight 5. nyankangaojwanghortechnology_spotlight_vol_97_pg_5_2016pdf.pdf
12. Ojwang J.D., R O.Nyankanga, J. Imungi, and M. Olanya, Ukuku D.  2016.  Cultivar preference and sensory evaluation of vegetable pigeon pea (Cajanus cajan) in Eastern Kenya. Food Security . 8:757–767. DOI 10.1007/s12571-016-0592-8(8):757–767.. Cultivar preference and sensory evaluation of vegetable pigeon pea (Cajanus cajan) in Eastern Kenya.pdf
D., OJ,, J.N Kiiru, O.M. Olanya, and D.O. Ukuku, Imungi J, Nyankanga RO.  2016.  Plant characteristics and growth parameters of vegetable pigeon pea cultivars. Subtropical Agriculture and Environments. ( 67:):1-12..Plant characteristics and growth parameters of vegetable pigeon pea cultivars.pdf
Ojwang J. D., R.O. Nyankanga, O.M. Olanya, and D.O. Ukuku, Imungi J.  2016.  Yield components of vegetable pigeon pea cultivars. Subtropical Agriculture and Environments. ( 67:):1-12..Yield components of vegetable pigeon pea cultivars

2015

P.D, M, Gathungu GK, Njogu MK, Nyankanga RO, Ambuko J, Landeo JA.  2015.  Optimization of seed potato (Solanum tuberosum L.) tuber dormancy and sprouting capacity through integrated gibberellic acid and benzylaminopurine application. Journal of Agriculture and Ecology Research International . 4(4):188-198.

2014

Njogu, M, Muindi E, Muthomi J, Nyankanga R, Muchiri P.  2014.  Phytophthora infestans responses to stinging nettle extract, phosphoric acid and fungicides combination, in Kenya. Direct Research Journal of Agriculture and Food Science . 2(9):128-134,.phytophthora_infestans_responses_to_stinging_nettle.pdf

2012

Nyankanga, RO, Onwonga RN, Wekesa FS, Nakimbugwe D, Masinde D, Mugisha J.  2012.  Effect of Inorganic and Organic Fertilizers on the Performance and Profitability of Grain Amaranth (Amaranthus caudatus L.) in Western Kenya. Journal of Agricultural Science. Journal of Agricultural Science. 4(1):223-232..

2011

2009

2008

Nyankanga, RO, Wein HC, Olanya OM.  2008.  Relationship Between Incidence of Late Blight Tuber Rot, Foliage Blight Control and the Effect of Weather and Soil Variables. Abstract

The relationship of late blight disease, tuber blight and the effects of weather and soil variables were determined at 2 distinct environments of New York and Kenya during 1999 to 2001. In well replicated field experiments at the two sites where A2 (US8 clone) and A1 (US1 clone) respectively are dominant, foliar and tuber blight development, climatic and soil variables were quantified during three cropping seasons. Variation in tuber blight in New York and Kenya was detected. Stepwise multiple regression and correlation analysis identified combinations of variables associated with tuber blight such as cultivar characteristics, soil temperature and precipitation events. The research results can provide insight into the dynamics of tuber blight infection processes and be useful for tuber blight management strategies.

Nyankanga, RO.  2008.  Development of Tuber Blight. (5)(43):1501-1508.abstract_2.pdf

2007

Kikuvi, GM, Schwarz S, Mitema ES, Kehrenberg C.  2007.  Streptomycin and chloramphenicol resistance genes in Escherichia coli isolates from cattle, pigs, and chicken in Kenya. AbstractWebsite

The aims of this study were to determine the genetic basis of streptomycin and chloramphenicol resistance in 30 Escherichia coli isolates from food animals in Kenya and the role of plasmids in the spread of the resistance. Seven of the 29 streptomycin-resistant isolates harbored both the strA and strB genes. Twenty-one of isolates had the strA, strB, and aadA1 genes. The strA gene was disrupted by a functional trimethoprim gene, dfrA14 in 10 of the 21 isolates harboring the three streptomycin resistance genes. Physical linkage of intact strA and sul2 genes was found in two different plasmids from four isolates. Linkage of cassette-borne aadA1 and dfrA1 genes in class 1 integrons was found in two of the isolates. Chloramphenicol resistance was due to the gene catA1 in all the chloramphenicol resistant isolates. The strB, strA, and catA1 genes were transferable by conjugation and this points to the significance of conjugative resistance plasmids in the spread and persistence of streptomycin and chloramphenicol resistance in food animals in Kenya.

2006

2004

2002

Wien, H.C., S.C. Stapleton, D.N. Maynard, C. McClurg, and R.O. Nyankanga, Riggs D.  2002.  Regulation of female flower development in pumpkin (Cucurbita spp) by temperature and light.

1996

H.C. Wien, undefined, Nyankanga R.  1996.  . Low light stress influences lower abscission and yield of bell pepper cultivars. HortScience. 31(4)

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