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

Now showing items 81-100 of 202

Leveraging on germplasm acquisition for Arabica coffee improvement in Kenya

Gichimu, Bernard M.; Omondi, Chrispine; Cheserek, Jane; Gimase, James (Scienceweb Publishing, 2016-01)

The low genetic variability within Coffea arabica species is a major hindrance to its improvement. The emergence of new pathogen races, especially for the prevalent fungus Hemileia vastatrix ...
Household's socio-economic factors influencing the level of adaptation to climate variability in the dry zones of Eastern Kenya

Mugendi, Daniel N.; Mugi-Ngenga, E.W.; Mucheru-Muna, M.W.; Mugwe, Jayne; Ngetich, F.K.; Mairura, F.S. (Elsevier, 2015-11)

Climate variability has a negative impact on crop productivity and has had an effect on many small-holder farmers in the arid and semi-arid lands (ASALs). Small-holder farmers in Eastern Kenya are faced with the constraint ...
Impact of reduced tillage and crop residue management on soil properties and crop yields in a long-term trial in western Kenya

Okeyo, Jeremiah; Norton, Jay; Koala, Saidou; Waswa, Boaz; Kihara, Job; Bationo, Andre (2015-11)

Sustainable farming practices are required to address the persistent problems of land degradation and declining crop productivity in sub-Saharan Africa (SSA). Approaches such as reducing tillage and retaining crop residues ...
Environmental factors influencing structure and distribution of east African green heart (Warburgia ugandensis Sprague) in Mt. Kenya Forest

Kairu, Anne; Gichuki, Nathan; Kanya, James; Kindt, Roeland (Academic Journals, 2014-06)

Effects from past climate, natural disturbances and human activities are significantly impacting negatively on current day processes in tropical indigenous trees forests. Most of the indigenous trees mostly hard woods have ...
Growth Parameters of DK8031 Maize Variety as Affected by Varying Irrigation and Nitrogen Fertilizer Rates in Embu County, Kenya

Onyari, Charles N.; Kibe, Antony M.; Mwonga, Samuel (David Publishing, 2015)

Determination of crop growth parameters of maize helps assess the performance of the crop for food security. A study was conducted in two seasons covering 2012 and 2013 to establish optimal irrigation and nitrogen fertilizer ...
Collembola Richness and Diversity along A Land-Use Intensity Gradient in Taita, Kenya

Muturi, John J.; Mbugi, J.P.; Mueke, J.M.; Lagerlöf, Jan; Mungátu, J.K.; Nyamasyo, G.; Gikungu, M. (2009)

Soil Collembola communities were sampled along a gradient of land use intensification in Taita-Taveta, Wundanyi division, Coast Province during the wet season (October-November 2007) and dry season (February- March ...
Collembola Density and Diversity along a Gradient of Land- Use Types in Embu District, Eastern Kenya

Muturi, John J.; Mbugi, J.P.; Mueke, J.M.; Lagerlóf, Jan; Mungatu, J.K.; Nyamasyo, G.; Gikungu, M. (2009)

Populations of soil-dwelling Collembola were monitored on a land use gradient ranging from Natural forests to intensively cultivated land during the wet season October-November, 2007 and dry season February-March, 2008. ...
Potential side effects of biocontrol and plant-growth promoting Bacillus amyloliquefaciens bacteria on earthworms

Lagerlöfa, J.; Ayukea, F.; Bejaib, S.; Jorgec, G.; Lagerqvista, E.; Meijerb, J.; Muturi, John J.; Söderlunda, S. (Elsevier, 2015-08)

Many bacteria strains are now successfully used for plant-growth promotion (PGPR) and as biocontrol agents (BCA) against plant diseases. Mechanisms behind their action involve production of enzymes and antibiotics, which ...
Effect of Integrated Soil Fertility Management Interventions on the Abundance and Diversity of Soil Collembola in Embu and Taita Districts, Kenya

Muturi, John J.; Mbugi, J.P.; Mueke, J.M.; Lagerlöf, J.; Mungátu, J.K.; Nyamasyo, G.; Gikungu, M. (2011)

The study aimed at identifying soil fertility management practices that promote the Collembola population, diversity and survival in the soil. Soil samples were randomly collected from on farm plots amended with: 1-Mavuno ...
Potential of deterministic and geostatistical rainfall interpolation under high rainfall variability and dry spells: case of Kenya’s Central Highlands

Kisaka, Oscar M.; Mucheru-Muna, M.; Ngetich, F.K.; Mugwe, Jayne; Mugendi, Daniel N.; Mairura, F.; Shisanya, C.A.; Makokha, G. L. (Springer, 2015-03)

Drier parts of Kenya’s Central Highlands endure persistent crop failure and declining agricultural productivity. These have, in part, attributed to high temperatures, prolonged dry spells and erratic rainfall. Understanding ...
Applicability of conservation agriculture for climate change adaptation in Rwanda’s situation

Kabirigi, M.; Musana, B.; Ngetich, F.K.; Mugwe, Jayne; Mukuralinda, A.; Nabahungu, N. L. (Academic Journals, 2015-09)

Improving food security and environmental conservation should be the main targets of innovative farming systems. Conservation agriculture (CA), based on minimum tillage, crop residue retention and crop rotations has been ...
Using Apsim-Model as A Decision-Support-Tool for Long-Term Integrated-Nitrogen-Management and Maize productivity under Semi-Arid Conditions in Kenya

Kisaka, Oscar M.; Mucheru-Muna, M.; Ngetich, F.K.; Mugwe, Jayne; Mugendi, Daniel N.; Mairura, F.; Muriuki, J. (Cambridge University Press, 2015-04)

There is continued decline in per capita agricultural productivity in the drier parts of Kenya’s central highlands. The declines have been linked to low and declining soil fertility, soil water, high atmospheric heat, ...
Effects of selected soil and water conservation techniques on runoff, sediment yield and maize productivity under sub-humid and semi-arid conditions in Kenya

Ngetich, F.K.; Diels, J.; Shisanya, C.A.; Mugwe, Jayne; Mucheru-muna, M.; Mugendi, Daniel N. (Elsevier, 2014-05)

tillage practices on runoff amounts, sediment yield and maize yields under semi-arid and sub-humid environments. Field trials were set in Kigogo primary school in Meru South Sub-County, Tharaka Nithi County, representing ...
Effects of selected soil and water conservation technologies onnutrient losses and maize yields in the central highlands of Kenya

Okeyo, A.I.; Mucheru-Muna, M.; Mugwe, Jayne; Ngetich, F.K.; Mugendi, Daniel N.; Diels, J.; Shisanyaaa, C.A. (Elsevier, 2014-02)

tMitigating nutrient loss is a prerequisite of sustainable agriculture in the tropics. We evaluated threesoil and water conservation technologies (mulching, minimum tillage and tied ridging) for two croppingseasons (long ...
Rainfall Variability, Drought Characterization, and Efficacy of Rainfall Data Reconstruction: Case of Eastern Kenya

Kisaka, Oscar M.; Mucheru-Muna, M.; Ngetich, F.K.; Mugwe, Jayne; Mugendi, Daniel N.; Mairura, F. (Hindawi Publishing Corporation, 2015)

This study examined the extent of seasonal rainfall variability, drought occurrence, and the efficacy of interpolation techniques in eastern Kenya. Analyses of rainfall variability utilized rainfall anomaly index, coefficients ...
Length of growing season, rainfall temporal distribution, onset and cessation dates in the Kenyan highlands

Ngetich, F.K.; Mugendi, Daniel N.; Mucheru-Muna, M.; Mugwe, Jayne; Shisanya, C.A.; Diels, J. (Elsevier, 2013-12)

Dependence on uncertain rainfall and exposure to unmitigated climate risk are major obstacles in efforts to sustainably intensify agricultural production and enhance rural livelihoods. There is generally enough seasonal ...
Genetic diversity of determinate French beans grown in Kenya based on morpho-agronomic and simple sequence repeat variation

Arunga, Esther E.; Kinyua, Miriam; Ochuodho, Julius; Owuoche, James; Chepkoech, Emy (Academic Journals, 2015-08)

French bean (Phaseolus vulgaris L.) in Kenya is cultivated predominantly in the Central, Eastern and Rift Valley provinces. Despite its importance as an export commodity, there has been little breeding effort devoted to ...
Production Functions and Their Use in Predicting Chickpea Biomass Yields When Grown under Varying Tillage and Sowing Dates in Naivasha, Kenya

Kibe, A.M.; Onyari, Charles N. (Scientific Research Publishing Co., 2007)

The use of production functions as tools for analyzing agronomic relationships and crop growth is gaining importance the world over. Their predictive value in crop adaptation trials for specific agro-ecological sites ...
Soil Organic Carbon and Nitrogen Fractions and Sugar Beet Sucrose Yield in Furrow-Irrigated Agroecosystems

Hurisso, Tunsisa T.; Norton, Jay B.; Mukhwana, Eusebius J.; Norton, Urszula (2015-03)

Soil organic matter (SOM) fractions were determined using extraction-, incubation-, and density-based fractionation techniques on samples collected from a range of furrow-irrigated sugar beet (Beta vulgaris L.) ...
Agroforestry in the drylands of eastern Africa: a call to action

Zeila, Abdi; Jama, Bashir (World Agroforestry Centre, 2005)

Drylands in eastern Africa typically suffer from unsustainable land uses that have evolved in the recent past. This paper reports on how agroforestry practices can contribute to sustainable land use in drylands drawing ...

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