Browsing Articles: Department of Water and Agricultural Resources Management by Author "Njoka, Fredrick M."
Now showing items 1-17 of 17
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Agronomic Performance of Single Crosses of Maize in Kiambu and Embu Counties of Kenya
Njoka, Fredrick M.; Kariuki, Jeniffer M. (2017-06)Aims: This study was conducted to determine the agronomic performance of respective maize single crosses in different environments in varying soil and climatic zones in Kenya. Methodology: The trials were conducted at ... -
Combining Ability of Inbred Lines of Maize (Zea mays) in Kiambu and Embu Counties, Kenya
Kariuki, J. M.; Njoka, Fredrick M.; Leley, P. K .; Manene, D. W. (Science Domain International, 2016-08)Despite the fact that virtually all households in Kenya grow maize, over 60% of them are net maize buyers because they do not produce enough for their consumption. This is due to both biotic and abiotic factors such as ... -
Determination of Post Striga Attachment Resistance in Selected Resistant Sorghum Lines in Kenya
Manene, Diana W.; Njoka, Fredrick M. (International Knowledge Press, 2017-05)Breeding for Striga resistance in sorghum and other cereals is recognized as the most sustainable control measure, however there is a lack of cereal germplasm that exhibit post attachment to Striga that limits this ... -
Determination of Stem Rust Ug99 Disease Severity in Selected Wheat Backcrosses in Kenya
Tubei, Jackline E.; Ombori, Omwoyo; Njau, Peter N.; Njoka, Fredrick M. (2017-05)Stem rust (Puccinia graminis tritici) is a disease of economic importance in wheat (Triticum aestivum L.) worldwide. The objective of this study was to determine the disease severity of the BC1F1 plants in the nursery at ... -
Genetic diversity of Faidherbia albida (Del.) A. Chev accessions held at the World Agroforestry Centre
Kithurea, Robert K.; Muchugia, Alice; Jamnadassa, Ramni; Njoka, Fredrick M.; Mwauraa, Lucy (Taylor & Francis, 2015-06)This study assessed the extent and distribution of genetic diversity of 29 Faidherbia albida provenances from 10 African countries by employing amplified fragment length polymorphism with an aim of providing crucial ... -
Genetic variability analysis for growth and yield parameters in double cross maize (Zea mays l.) genotypes in Kitale county of Kenya
Melil, Charles K.; Ombakho, George; Omari, Odongo M.; Njoka, Fredrick M. (Science Journals Publishing, 2013)Present study was conducted to select hybrids with improved yield, to identify testers for grain yield and to determine the magnitude of genetic variability in maize hybrids for yield and its elements. Adaptability of ... -
Genotype variant of soybean cultivars around Lake Victoria region, East Africa
Okwany, Zedekiah A.; Njoka, Fredrick M.; Githui, Elijah (2010-01)Glycine gracilis, which originated from North-East China, is morphologically intermediate between the cultivated G. max and the wild form, G. soja. These three forms are cross-compatible and their crosses provide a resource ... -
Genotype X Environment Interaction of Inbred Lines of Maize (Zea Mays L.) and Stability of Crosses in Kiambu and Embu Counties, Kenya.
Muriuki, J. M.; Njoka, Fredrick M.; Leley, P. K.; Manene, D. W. (2016-05)Despite the fact that virtually all households in Kenya grow maize over 60% of them are net maize buyers because they do not produce enough for their consumption. Kenya’s current food supply situation and outlook give ... -
Identifying Morpho-Physiological Characteristics Associated with Drought Tolerance in Selected Chikpea Germ Plasm in Nakuru and Baringo Counties, Kenya
Kirui, Grace J.; Njoka, Fredrick M. (2013-11)This paper examines the morpho-physiological characteristics of chickpea associated with drought tolerance based on a study of selected chickpea lines under field conditions in Nakuru and Baringo counties in Kenya. Drought ... -
Identifying Morpho-Physiological Characteristics Associated with Drought Tolerance in Selected Chikpea Germ Plasm in Nakuru and Baringo Counties, Kenya
Kirui, Grace J.; Njoka, Fredrick M. (2013-11)tolerance based on a study of selected chickpea lines under field conditions in Nakuru and Baringo counties in Kenya. Drought has been spreading to more land in Kenya over the years due to climatic change attributed to ... -
Introgression of Stem Rust Resistance into Popular Kenyan Wheat Varieties to Improve Production
Jackline, Tubei E.; Njoka, Fredrick M.; Ombori, Omwoyo; Njau, Peter N. (2018-02)Aim: The objective of this study was to assess the introgression of the stem rust resistance genes into the BC1F1 plants using molecular markers. Place and Duration of Study: Field experiments were carried out in a ... -
Molecular genotyping of selected soybean (Glycine max L.) genotypes grown in different regions of East Africa
Njoka, Fredrick M.; Okwany, Z.A.; Githui, E.K. (2010)Soybean (Glycine max (L.) Merril) is one of the most popular pulses because of its protein content and nodulating ability. However, most farmers and researchers do not have sufficient genetic information of the genotypes ... -
Pathogenicity of Colletotrichumkahawae in Kenya
Njoka, Fredrick M.; Owaka, Margaret; Omondi, Chrispine; Kathurima, Elijah (2017-05)This study was aimed at determining the virulence diversity of Colletotrichumkahawae, and their correlation with coffee growing regions and interaction with coffee varieties in Kenya. A total of 34 single conidia isolates ... -
Physiological and Agronomic Performance of Domesticated and Wild Cotton Germplasm from Selected Regions of Kenya
Kiranga, Anthony N.; Njoka, Fredrick M.; Nderito, Charles W. (2017-05)making cooking oil, soup and seed cake for animal feed industry among other uses. Performance of wild cotton germplasm in Kenya has not been well studied and therefore there is need for understanding the correlation of ... -
Public perceptions towards genetically modified crops and foods in Kenya
Anunda, H.; Njoka, Fredrick M.; Shauri, H. (2009)The broad objective of the study was to assess public perception towards Genetically Modified (GM) Crops and Foods in Kenya. The specific objectives were to find out the influence of background factors and Agro-ecological ... -
Screening for Water Deficit Tolerance, Relative Growth Analysis and Agrobacterium-Infectivity in Tropical Maize [Zea Mays L.] Inbred Lines in Nairobi, Kenya
Olive, Sande F.; Njoka, Fredrick M.; Mgutu, Allan J.; Anami, Sylvester E. (2014-10)The gap between maize demand and regional supply is increasing as small-holder farmers grapple with many challenges, key among them drought. Research in identifying maize lines that are tolerant to water deficit and that ... -
Screening for Water Deficit Tolerance, Relative Growth Analysis and Agrobacterium-Infectivity in Tropical Maize [Zea Mays L.] Inbred Lines in Nairobi, Kenya
Sande, Olive F.; Njoka, Fredrick M.; Mgutu, Allan J.; Anami, Sylvester E. (2014-10)The gap between maize demand and regional supply is increasing as small-holder farmers grapple with many challenges, key among them drought. Research in identifying maize lines that are tolerant to water deficit and that ...