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Articles: Department of Water and Agricultural Resources Management: Recent submissions

Now showing items 41-60 of 202

Characterization of Kenyan French Bean genotypes into gene pool affiliations using allele specific markers

Arunga, Esther E.; Odikara, Shadrack O. (ACADEMIC JOURNALS, 2020-07)

French bean (Phaseolus vulgaris L.) is a major export crop in Kenya where it serves as a cash crop for smallholder farmers and a source of employment. However, there is limited information on characterization of available ...
Morphological and Molecular Characterization of Toxigenic Aspergillus flavus from Groundnut Kernels in Kenya

Okayo, Robert O.; Andika, Darius O.; Dida, Mathews M.; K’Otuto, George O.; Gichimu, Bernard M. (Hindawi, 2020-09)

Pathogenesis of Aspergillus flavus on important agricultural products is a key concern on human health due to the synthesis and secretion of the hazardous secondary metabolite, aflatoxin. &is study identified and further ...
Enhancing legume crop pollination and natural pest regulation for improved food security in changing African landscapes

Otieno, Mark; Dewentera, Ingolf S.; Potts, Simon G.; Kinuthia, Wanja; Kasina, Muo J.; Garrattb, Michael P.D. (Elsevier, 2020-09)

Legumes are important crops for food security, consumed by millions of people especially in Africa where they are an essential protein source and provide key vitamins and minerals. Most legumes depend on insect pollination ...
Combining Host Plant Resistance, Selective Insecticides, and Biological Control Agents for Integrated Management of Tuta absoluta

Nderitu, Peris W; Jonsson, Mattias; Arunga, Ester E.; Otieno, Mark; Muturi, John J.; Wafula, Geoffrey O. (Hindawi, 2020-08)

Combination of pest management strategies that minimize pesticide use and conserve natural enemies is important for a sustainable environment. Overreliance on synthetic insecticides in the management of Tuta absoluta has ...
Quantitative trait loci (QTL) mapping of resistance to coffee berry disease (Colletotrichum kahawae Waller & Bridge) in Coffea arabica L. variety Rume Sudan

Gimase, James M.; Thagana, Wilson M.; Omondi, Chrispine; Cheserek, Jane Jerono; Gichimu, Bernard M.; Gichuru, E. K. (Academic Journals, 2020-06)

Coffee Berry Disease (CBD) is a major constraint that limits Coffea arabica production, whose resistance is governed by three genes, T, R that are dominant and recessive k in varieties Hibrido de Timor (HDT), Rume Sudan ...
Exploring the Changes of Resistant Genes Expression in Groundnuts (Arachis Hypogea) In Response to Aspergillus Flavus Exposure at Seedling Stage

Okayo, Robert O.; Andika, Darius O.; Dida, Mathews M.; K’Otuto, George O.; Gichimu, Bernard M. (2020-07)

Aspergillus flavus infect groundnut seeds and produce secondary metabolites, aflatoxins. The aflatoxins are associated with various diseases in domestic animals and humans globally. Mitigating the aflatoxin contamination ...
In Vitro Control ofPhytophthora infestans and Alternaria solani Using Crude Extracts and Essential Oils from Selected Plants

Mugao, Lydia G.; Muturi, Phyllis W.; Gichimu, Bernard M.; Njoroge, Ezekiel K. (Hindawi, 2020-07)

Tomato production is constrained by fungal diseases especially the early and late blight caused by Alternaria solani and Phytophthora infestans, respectively. Control of the two diseases is usually by use of synthetic ...
Productivity of Selected Cabbage Varieties under Varying Drip Irrigation Schedules in Humic Nitisols of Embu County, Kenya

Onkoba, Stephen O.; Onyari, Charles N.; Gichimu, Bernard M. (Hindawi, 2021-05)

Use of controlled irrigation in vegetable production is considered a viable option for optimizing input use and productivity. %is study aimed at assessing the eﬀects of diﬀerent drip irrigation schedules on productivity ...
Adoption Determinants of Adapted Climate Smart Agriculture Technologies Among Smallholder Farmers in Machakos, Makueni, and Kitui Counties of Kenya

Muriithi, Lydia N.; Onyari, Charles N.; Mogaka, Hezron R.; Gichimu, Bernard M.; Gatumo, Geoffrey N.; Kwena, Kizito (2021-04)

The study examined the adoption determinants of adapted climate smart agriculture (CSA) technologies among smallholder farmers. A multi-stage sampling procedure was used to select a total sample of 384 households. Percentages ...
Development of a Water Quality Assessment Index for the Chania River, Kenya

Kasyoka, Robert; Onyari, Charles N.; Mbaka, James G. (Taylor and Francis, 2020-11)

Human-related activities are known to have deleterious effects on the water quality of aquatic ecosystems, but there is limited information on the impact of these on rivers in tropical regions, such as the Chania River ...
Development of a Water Quality Assessment Index for the Chania River, Kenya

Robert, G. K.; Onyari, Charles N.; Mbaka, J. G. (Taylor and Francis, 2020-11)

Human-related activities are known to have deleterious effects on the water quality of aquatic ecosystems, but there is limited information on the impact of these on rivers in tropical regions, such as the Chania River ...
Performance of Three Isolates of Metarhizium anisopliae and Their Virulence against Zeugodacus cucurbitae under Different Temperature Regimes, with Global Extrapolation of Their Efficiency

Onsongo, Susan K.; Gichimu, Bernard M.; Akutse, Komivi S.; Dubois, Thomas; Mohamed, Samira A. (MDPI, 2019-08)

The performance of entomopathogenic fungi in pest control is usually a ected by both biotic and abiotic factors. This study aimed to determine the e ects of various temperatures (15, 20, 25 and 30 C) on conidial ...
Witchweed’s Suicidal Germination: Can Slenderleaf Help?

Mwakha, Fridah A.; Budambula, Nancy; Neondo, Johnstone O.; Gichimu, Bernard M.; Odari, Eddy O.; Kamau, Peter K.; Odero, Calvins; Kibet, Willy; Runo, Steven (MDPI, 2020-06)

The parasitic plant Striga hermonthica (Delile) Benth. is stimulated to germinate by biomolecules (strigolactones) produced in the roots of host and some non-host plants. Non-hosts induce Striga’s suicidal germination ...
Morphological and Molecular Characterization of Azolla Accessions in Kenya

Oyange, W. A.; Kanya, J. I.; Chemining’wa, G. N.; Njiruh, Nthakanio P. (Tropical and Subtropical Agroecosystems, 2020-05)

Background. Azolla Lam., a mosquito fern, is invasive in major rice growing Schemes in Kenya, where it clogs irrigation canals and forms dense mats in paddy fields. However, the species of Azolla has not been established. ...
Effect of time of Azolla incorporation and inorganic fertilizer application on growth and yield of Basmati rice

Oyange, W. A.; Chemining’wa, G. N.; Kanya, J. I.; Njiruh, Nthakanio P. (Academic Journals, 2020-03)

Azolla tissue contains 5% N, which is slowly released into the soil upon decomposition. Timing of incorporation is therefore important for maximum benefit to a crop. The effect of time to incorporate Azolla biomass on ...
Azolla Fern in Mwea Irrigation Scheme and Its Potential Nitrogen Contribution in Paddy Rice Production

Oyange, W. A.; Chemining’wa, G. N.; Kanya, J. I.; Njiruh, Nthakanio P. (Canadian Center of Science and Education, 2019-11)

Azolla fern is invasive in Mwea Irrigation Scheme in Kenya and its management in paddy rice fields is a challenge to farmers. A survey was undertaken to establish farmer’s knowledge and potential nitrogen contribution ...
Populations of Biomphalaria spp. Snails Isolates in Kenya Show Variable Resistance to Schistosome Infection

Ngigi, D. M.; Githui, E. K.; Aman, R. A.; Wanjala, F. M.; Stella, R. K.; Njiruh, Nthakanio P.; Nguu, E. K. (Trade Science Inc., 2018-10)

Fresh water snails of genus Biomphlaria, Bulinus and Ocomelinia are important vectors for human schistosomiasis. Human contact patterns with water infested with cercaria are important factors in transmission of schistosomiasis ...
Trait matching of flower visitors and crops predicts fruit set better than trait diversity

Garibaldi, Lucas A.; Otieno, Mark; Bartomeus, Ignasi; Bommarco, Riccardo; Klein, Alexandra M.; Cunningham, Saul A.; Aizen, Marcelo A.; Boreux, Virginie; Garratt, Michael P. D.; Carvalheiro, Luısa G.; Kremen, Claire; Morales, Carolina L.; Schuepp, Christof (Wiley Online Library, 2015)

Summary Understanding the relationships between trait diversity, species diversity and ecosystem functioning is essential for sustainable management. For functions comprising two trophic levels, trait matching between ...
A global synthesis of the effects of diversified farming systems on arthropod diversity within fields and across agricultural landscapes. Global Change Biology

Lichtenberg, E.; Otieno, Mark; Christina, Kennedy M.; Kremen, Claire; Batary, Peter; Berendse, Frank; Bommarco, Riccardo; Bosque-Perez, Nilsa A.; Carvalheiro, Luısa G.; Snyder, William E.; Williams, Neal M. (Wiley Online Library, 2017-03)

Agricultural intensification is a leading cause of global biodiversity loss, which can reduce the provisioning of ecosystem services in managed ecosystems. Organic farming and plant diversification are farm management ...
From Shiny Shoes to Muddy Reality: Understanding How Meso-State Actors Negotiate the Implementation Gap in Participatory Forest Management

Kairu, Anne; Upton, C.; Huxham, M.; Kotut, Kiplagat; Mbeche, R.; Kairo, J. (Taylor and Francis Online, 2017-11)

Recent research on participatory forest management (PFM) in the global south has highlighted the existence of a widespread “implementation gap” between the ambitious intent enshrined in legislation and the often partial, ...

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