Publications

Found 65 results

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2012
Gichuru L, Derera J, Njoroge K. "The incidence of diseases and other constraints found in small-scale maize cropping systems of Kenya-midlands.". In: Annual Joint Meeting of the National Association of Plant Breeders (NAPB), and the Plant Breeding Coordinating Committee PBCC).; 2012.
Gakunga 24 J, Mugo S, Njoroge K, Olubayo F. "Combining ability of maize inbred lines resistant to Chilo partellus (Swinhoe) in the mid-altitude environment of Kenya." Journal of Plant Breeding and Crop Science. 2012;4(10):161-168.
H K, Njoroge K, Mugo S, Ariga ES, Kanampiu F, Nderitu JH. "Determination of levels of Striga germination stimulants for maize gene bank accessions and elite inbred lines." International Journal of Plant Production. 2012;6(2):209-224.
H K, Njoroge K, Mugo S, Ariga ES, Kanampiu F, Nderitu JH. "Determination of levels of Striga germination stimulants for maize gene bank accessions and elite inbred lines." . International Journal of Plant Production. 2012;6 (2):209-224.
Karaya H, Kiarie N, Mugo S, Kanampiu F, Ariga E, Nderitu J. "Identification of new inbred lines with resistance to Striga hermonthica ." Journal of Crop Protection. 2012; I (2):131-142.
Karaya H, Kiarie N, Mugo S, Kanampiu F, Ariga E, Nderitu J. "Identification of new inbred lines with resistance to Striga hermonthica (del.) Benth." Journal of Crop Protection. 2012;1(2):131-142.
Bigirimana J, Njoroge K, Gahakwa D, Phiri. NA. "Incidence and severity of coffee leaf rust and other diseases in Rwanda." African Journal of Agricultural Research. 2012;7(26):3847-3852.
Mwololo JK, Muturi PW, Mburu MWK, Njeru RW, Kiarie N, Munyua JK, Ateka EM, Muinga RW, Kapinga RE, Lemaga B. "Integration of farmers in technology developments as a basis for enhancing sweet-potato productivity in Kenya. .". In: Published online at knowledge.cta.int/en/content/view/full/15294.; 2012.
Ngaboyisonga C, Njoroge K, Kirubi D, Githiri SM. "Quality protein maize under low N and drought environments: Endosperm modification, protein and tryptophan concentration in grain." Agricultural Journal. 2012;7(7):327-338.
2011
Rudebjer P, Chakeredza S, Dansi A, Ekaya W, Ghezae N, Aboagye LM, Kwapata M, Njoroge K, Padulosi S. "Beyond commodity crops: Strengthening young scientists’ capacity for research on underutilized species in Sub-Saharan Africa.". In: 2nd International Symposium on Underutilised Plant Species. Kuala Lumpur, Malaysia; 2011.
Karaya H, Kiarie N, Mugo S, Nderitu H, Kanampiu F, Ariga E. "Combining ability of maizeinbred lines resistant to Striga hermonthica (Del.) Benth. evaluated under artificial Striga infestation in Kenya. .". In: 11th World Congress on parasitic weeds. Martina, Franca, Italy.; 2011.
Bigirimana J, Njoroge K, Muthomi W, Gahakwa D, Phiri NA, Gichuru EK. "Breeding for resistance to coffee leaf rust (Hemileia vastatrix Berkely and Brome) and coffee berry disease (Colletotrichum kahawae Waller and Bridge) in Rwanda.". In: aGRO 2011 Biennial Conference. Rwanda; 2011.
L. G, Njoroge K, Ininda J, Lorroki P. "Combining ability of grain yield and agronomic traits in diverse maize lines with maize streak virus resistance for Eastern Africa region." Agriculture and Biology Journal of North America. 2011;2(3):432-439.
Onditi JO, Njoroge K, I.S. S. "Identification of suitable parents and temperatures for breeding potato virus Y (PVX) and potato virus X (PVX) resistant potatoes. ." Agriculture and Biology Journal of North America.. 2011;2(12):1409-1415.
K MJ, M.W.K M, Muturi PW, R.W N, Kiarie N, E.M A, J.K M. "Morphological differences among susceptible and resistant sweet potato varieties.". In: aGRO 2011 Biennial Conference.; 2011.
W MP, Mburu MWK, Mwololo JK, Ateka EM, Njeru RW. "Response of sweet potato varieties for white flies resistance.". In: K. Njoroge .; 2011.
P. R, Schagen VB, Chakeredza S, Njoroge K, Kamau H, Baena M. "Teaching Biodiversity: A curriculum Guide for Higher Education.". In: Biodiversity International, Rome Italy.; 2011.
Kosgei T, Makumbi D, Njoroge K. "Use of GGE biplot method to evaluate stability of performance of new maize hybrids in eastern Africa.". In: aGRO 2011 Biennial Conference c2098.; 2011.
2010
Karaya H, Kiarie N, Mugo S, Nderitu H, Kanampiu F, Ariga S. "Screening maize (Zea mays) genotypes for Striga hermonthica resistance from among genebank accessions.". In: 12th KARI Biennial Scientific Conference. Nairobi, Kenya; 2010.
Muturi PW, P.W. M, Munyiri JK, P. RSW, Munyua JK, M. M, E. M, N. K. "A perspective on proteomics: Current applications, challenges and potential uses." Agriculture and Biology Journal of North America. 2010;1(5):916-918.
Karaya H;, Mugo S;, Njoroge K;, Ariga E;, Nderitu JH;, Kanampiu. "Screening gene bank maize accessions for Straiga hermontica resistance."; 2010.
2009
Mwololo JK, Muturi PW, Mburu MWK, Njeru RW, Kiarie N, K.Munyua J, Ateka EM, Muinga RW, Kapinga RE. "Additive main effects and multiplicative interaction analysis of genotype x environmental interaction among sweetpotato genotypes. ." Journal of Animal & Plant Sciences. 2009;2(3):148-155.
Karaya H, Njoroge K, Mugo S, Nderitu H. "Combining ability among twenty insect maize inbred lines resistant to Chilo partellus and Busseola fusca stem borers." International Journal of Plant Production. 2009;3(1):115-127.
Ngaboyisonga, Njoroge K, Kirubi D, Githiri SM. "Effects of low nitrogen and drought on genetic parameters of grain yield and endosperm hardness of Quality Protein Maize." Asian Journal of Agricultural Research. 2009;3:1-10.
2008
15. Ngaboyisonga, Njoroge K, Kirubi D, Githiri SM. "Effects of field conditions, low nitrogen and drought on genetic parameters of protein and tryptophan concentrations in grain of quality protein maize." International Journal of Plant Production. 2008;2:137-151.
2007
P.W M, J.M M, M.W.K M, R.W N, N K, J.K M, E.M A, R.W M, R.E K. "Strategies for maintaining sweet potato nurseries free from insect vectors that spread Sweet potato Virus Disease.". In: African Crop Science Society Conference (ACSS).; 2007.
J.K M, P.W M, M.W.K M, R.W N, N K, J.K M, E.M A, R.W M, R.E K. "Participatory evaluation of sweet potato production in Kirinyaga and Kwale districts in Kenya.". In: Regional Universities Forum Biennial Meeting. Mangochi, Malawi; 2007.
P.W M, M.W.K M, R.W N, N K, J.K M, E.M A, R.W M, R.E K. "Screening for tolerance in selected sweet potato germplasm to Sweet-potato Virus Disease in Kenya.". In: Regional Universities Forum Biennial Meeting. Mangochi, Malawi; 2007.
Ngaboyisonga C, Njoroge K, Kirubi D, Githiri SM. "Effects of low nitrogen and drought on grain yield and endosperm hardness of quality protein maize single cross hybrids. In: Sustainable agricultural productivity for improved food security and livelihoods.". In: Proceedings of the National Conference on Agricultural Research Outputs of Rwanda. Serena Hotel, Kigali, Rwanda; 2007.
Gichuru L, Ininda J, Njoroge K. "Maize streak virus (MSV) disease expression in F1 hybrids of diverse genotypes.". In: 10th KARI biennial conference. Nairobi, Kenya ; 2007.
Njoroge K, Kinyanjui M. "Agricultural Development and Globalisation in Kenya." In: Gender in International Agricultural Trade Agreements: A Kenya synopsis. Heinrich Boll Foundation, East and Horn of Africa Region. 2007:1-6.
Njoroge K, Kinyanjui M. "Kenya Agricultural Development and Globalisation: where do we stand?" Gender in International Agricultural Trade Agreements: A Kenya synopsis. Heinrich Boll Foundation, East and Horn of Africa Region. 2007:103-111.
2004
Kithusi 12. GG, Knapp SK, Shibairo SI, Nderitu JH, Njoroge K. "Effects of biopestcides on spider-mites (Tranychus evansi Baker and Pritchard) in the laboratory." Phytophaga. 2004;14:1-8.
2003
L. M, Njoroge K, Bett C, Mwangi W, Verkuijl H, Groote DH. The Seed Industry for Dryland Crops in Eastern Kenya.; 2003.
2000
Bett C;, De Groote H;, Diallo A;, Muasya W;, Njoroge K. "Participatory plant breeding for drought resistant maize varieties in eastern Kenya."; 2000.
1999
Njoroge K, Omanga P, Mwangi W, Bett C, Muhammad L. "Meeting challenges of quality seed supply.". In: Maize Production Technology for the Future: Challenges and Opportunities. Proceedings of the 6th E & S Africa Regional Maize Conference. CIMMYT, Addis-Ababa, Ethiopia; 1999.
K N, Omanga P, Mwangi W, Bett C, Muhammad L. "Meeting supply Challenges of quality seed in semi-arid eastern Kenya. In: CIMMYT and EARO Maize Production Technology for the Future: Challenges and Opportunities.". In: Sixth Eastern and Southern Africa Regional Maize Conference. Addis Ababa, Ethiopia: CIMMYT) and EARO; 1999.
Bett C, Muhammad L, Mwangi W, Njoroge K. "The seed industry in the semi-arid eastern Kenya.". In: Proceedings of the 6th E & S Africa Regional Maize Conference. CIMMYT, Addis-Ababa, Ethiopia; 1999.
Muhammad L, Bett C, Mwangi W, Omanga PGA, Njoroge K. "Seed production and trade in the semi-arid midlands of Kenya.". In: Maize Production Technology for the Future: Challenges and Opportunities. Proceedings of the 6th E & S Africa Regional Maize Conference. CIMMYT, Addis-Ababa, Ethiopia; 1999.
1998
Hassan R, Njoroge K, Ngure M, Otsyula R, Laboso A. "Adoption patterns and performance of improved maize in Kenya. In: R.M. Hassan, (Ed).". In: Maize Technology Development and Transfer: A GIS application for research planning in Kenya (Chapter 7). CAB International, Oxford and New York; 1998.
Hassan R, Corbett J, Njoroge K. "Maize Technology Development and Transfer: A GIS application for research planning in Kenya (Chapter 4) (Chapter 4). .". In: ). Combining geo-referenced survey data with agro-climate attributes to characterize maize production systems in Kenya. In: R.M. Hassan (Ed). CAB International, Oxford and New York:; 1998.
1997
Njoroge K;, Wafula B;, Ransom JK. "Characterization of drought stress in the major maize production zones of Kenya."; 1997. Abstract

Maize, the most important cereal crop in Kenya, is grown from sea level to more than 2300 m elevation. With the use of geographic information system (GIS) techniques, six distinct maize agro- climatic zones have been defined for the main rainy season in Kenya. The objective of this study was to characterize each of these zones for the degree and timing of drought stress. For each of the six maize zones, two representative sites with extensive weather records were used. Long term means for rainfall for 10 d periods were compared to the potential evapotranspiration of the same period at each site. Maize phenological development was superimposed on these data. In the highland and moist transitional zones, which comprise 75 Per cent of the maize area, drought occurrences were limited. The moist midaltitude zone had the greatest variability in moisture stress between sites, and late season drought is consistently a problem. The dry midaltitude and dry transitional zones experience the most severe drought, especially during grain filling and early in the season. In the lowland tropics, significant moisture stress occurs during the first 20 d of the season and during the last 40 d of growth. These data suggest that drought tolerance is needed for germplasm being developed for four of the six zones.

Kimotho LM, Ransom JK, Njoroge K. "Performance of five new varieties in three agroecozones of semi-arid Eastern Kenya.". In: Africa Crop Science .; 1997.
Kimotho LM, Ransom JK, Njoroge K. "Performance of five new varieties in three agroecozones of semi-arid Eastern Kenya." Africa Crop Science Conference Proceedings. 1997;Vol.3:761-764.
Njoroge K, M’ragwa LR, Ngure M. "Yield stability in F1 hybrid composite varieties of maize in semi-arid Kenya." Africa Crop Science Conference Proceedings. 1997;Vol.3:221-224.
1996
Mugo SN, Njoroge K. "Alleviating the effects of drought on maize production in the moisture stress areas of Kenya through escape and tolerance." Symposium on developing drought and low nitrogen tolerant maize, El-Batan, Mexico. CIMMYT. 1996:35-38.
Njoroge K, Wafula B, Ransom JK. "Characterisation of drought in the major maize production zones in Kenya." Symposium on developing drought and low nitrogen tolerant maize, El-Batan, Mexico. CIMMYT. 1996:35-38.
1995
K N. "Seedling vigour as a selection criterion in breeding maize under water stress."; 1995. Abstract

The study was carried out between 1986 and 1988 to investigate the relationships between flowering habit, plant phenotypic appearance, seedling vigour and grain yielding ability while breeding early maturing maize. Four rainfed and four irrigated trials were conducted in a semi-arid area of eastern Kenya with two growing seasons per year, the long and the short rains. In the first group of trials, comprising Experiment 1, relationships between the various traits of interest were studied within cultivars that have been developed by the programme at Katumani, a breeding centre located in the area of interest. In Experiment 2, Sl selection was practiced on the same materials looking for early and for late flowering plants within a population of 2,000 plants per cultivar. Results from both experiments showed similar relative changes, although of lesser magnitude in Experiment 2. Seedling vigour was positively correlated with grain yield and was not correlated with flowering time and, therefore, maturity. Unlike grain yield, seedling vigour interacted little with the environment of growth. Experimental precision seemed to increase with additional water applied as irrigation. It was concluded that current cultivars have scope to be improved using good plant type and seedling vigour as the major selection criteria for yield. It was also concluded that selection could be aided by irrigating some of the trials to increase the environmental range covered, especially during the long rains season which was evidently the less reliable.

1994
Njoroge K. "Seedling vigour as a selection criterion in breeding maize under stress.". In: Eastern and Southern Africa Regional Maize Conference . Harare, Zimbabwe; 1994.
1992
Gebrekidan B, Wafula BM, Njoroge K. "Agro-ecological zoning in relation to maize research priorities in Kenya." Review of National Maize Research Programme. KARI/ISNAR. . 1992:1-4.
Njoroge K, Kanampiu NN, Otsyula RM, Muthamia ZK, Gathuri CG, Chivatsi WS. "The High-Altitude maize programme." Review of National Maize Research Programme. KARI/ISNAR. 1992:20-31.
1989
Chumo JJ, Ochieng JAW, Njoroge K, Compton WA. "Maize improvement, production and protection in Eastern and Southern Africa.". In: Proceedings of the 3rd E & S Africa Regional Maize Conference. Nairobi & Kitale; 1989.
1987
Njoroge K, Ngure M. "Breeding maize in semi-arid Eastern Kenya. Chapter 18." Food Grain production in semi-arid Africa. 1987:245-254.
1984
Njoroge 4 K. "Katumani maize Breeding: The First Twenty Five Years." East African Agriculture and Forestry Journal. 1984;40:287.
Waite BH, Njoroge K. "Principal diseases of maize, sorghum and millet in the semi-arid areas of Kenya." East African Agriculture and Forestry Journal: . 1984;40: :197.
1982
Njoroge 2 K. "Earliness and yield in maize: An evaluation of some Katumani maize varieties." East African Agriculture and Forestry Journal. 1982;48(2):pp 40-50.
Njoroge K, Welch W, Habgood RM. "Heritability and selection for grain nitrogen yield and its components in F2 populations of spring barley." Journal of Plant Breeding. (Z. Pflanzensunchtg). 1982;90:305-315.
Njoroge, K; Mwendwa EW. Maize in Kenya: development and production.; 1982.
1981
Welch 1 RW, Njoroge K, Habgood RM. "Selection for increased grain protein production in Barley.". In: Barley Genetics IV (Chapter 5), Pp 271-278. Edinburgh University Press; 1981.

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