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

Now showing items 101-120 of 202

Improving soil health in Africa: challenges and promising solutions

Zeila, Abdi; Jama, Bashir; Harawa, Rebbie (2014-07)
Sensitivity of microscopy compared to molecular diagnosis of p. Falciparum: implications on malaria treatment in epidemic areas in kenya

Wangai, L.N.; Karau, M.G.; Njiruh, Nthakanio P.; Sabah, O.; Kimani, F.T.; Magoma, G.; Kiambo, N. (2011)

Detection of Plasmodium species by microscopy has been the gold standard for diagnosis of malaria for more than a century. Despite the fact that there is a significant decline in the number of positive cases reported from ...
Programmed cell death-like behavior in photoperiod-sensitive genic male sterile (PGMS) rice

Njiruh, Nthakanio P.; Qingzhong, Xue (Academic Journals, 2011-04)

In photoperiod-sensitive genic male sterile rice (Oryza sativa L.) pollen abort in long day and high temperature, and revert to fertility in short day length and low temperature growth conditions. This type of control of ...
Partial Nucleotide Sequences of Sweet Potato Leaf Curl Virus Occurring in Kenya and its Phylogenetic Relationship with other Members of Begomoviruses

Maina, S.; Miano, W.; Runo, S.M.; John, I.; Mbogo, E.; Monjero, E.; Njiruh, Nthakanio P. (2012-11)

Sweet potato leaf curl virus has been reported in different sweet potato growing regions of Kenya. Partial nucleotide sequences of Kenyan Sweet potato leaf curl virus isolates were compared with other isolates from different ...
Evaluation of photoperiod and thermosensitive genic male sterile lines for hybrid rice seeds production in Kenya

Kanya, James I.; Njiruh, Nthakanio P.; Kimani, John M.; Wajogu, Raphael K.; Kariuki, Simon (2013)

Photo–thermo-sensitive genic male sterile (P(T)GMS) rice is a new hybrid rice technology that uses prolonged light length and high temperatures to induce sterility. This technology is being introduced in Kenya but such ...
Molecular characterization and Antimicrobial Resistance Patterns of Escherichia Coli Isolates from Goats Slaughtered In Parts of Kenya

Njiruh, Nthakanio P.; Kariuki, S.; Njoroge, S.; Muigai, A.W.T. (Research Gate, 2013-01)

Objective: To determine the antibiotic resistance patterns of pathogenic Escherichia coli on goat meat carcass at Huruma and Kiserian abattoirs in Kenya. Design: Laboratory based study. Setting: Huruma and Kiserian ...
Tracking the expression of photosensitive genic male sterility genes in rice

Njiruh, Nthakanio P.; Qingzhong, Xue (Academic Journals, 2013-11)

Photoperiod sensitive genic male sterile rice lines contain genes that induce complete sterility in high temperature and long day light length period, and revert to fertility in optimum low temperature and short day light ...
Production of Hybrid Basmati Rice in Kenya: Progress and Challenges

Njiruh, Nthakanio P.; Kanya, James I.; Kimani, John M.; Wajogu, Raphael (2013)

Photoperiod sensitive genic male sterile (PGMS) and Thermosensitive genic male sterile (TGMS) rice varieties require a long day light length and high temperature respectively growth conditions for them to be completely ...
Segregation disortion of anthocyanin morphological marker in F2 population of cross between basmati and environment genic male sterile rice lines

Njiruh, Nthakanio P.; Kanya, James I.; Kimani, John M.; Wanjogu, Raphael K.; Kariuki, Simon N. (2013)

Basmati rice (Oryza sativa L.) is preferred by many Kenyans yet its yield per hectare is low. This challenge led to initiation of Basmati hybrid rice project in Kenya with a goal of leaping yield benefits of heterosis. ...
Demarcating day-light-length from temperature effects in PGMS rice using back tracking method.

Njiruh, Nthakanio P.; Qingzhong, Xue (2014)

Two near isogenic rice lines ZAU11S106 (Photoperiod sensitive genic male sterile) and ZAU11F121(a ZAU11S106 whose PGMS gene has undergone reverse mutation to become a non-PGMS) were used. These two lines were studied to ...
Local and landscape effects on bee functional guilds in pigeon pea crops in Kenya

Otieno, Mark; Sidhu, Sheena C.; Woodcock, Ben A.; Wilby, A.; Ioannis, N.; Mauchline, Alice L.; Gikungu, Mary W.; Potts, Simon G. (Springer, 2015-07)

Pollinators face many challenges within agricultural systems due to landscape changes and intensification which can affect resource availability that can impact pollination services. This paper examines pigeon pea pollination ...
The effects of exchange rate liberalization in Kenya on French beans exports

Mwangi, Samuel C.; Mbatia, Oliver; Nzuma, Jonathan Makau (Pak Publishing Group, 2014)

The adoption of a floating exchange rate system in Kenya was an effort to make it more aligned to the market determined equilibrium rate. However, there is limited empirical evidence that success has since been achieved ...
Effects of Market Reforms on Irish Potato Price Volatility in Nyandarua District, Kenya

Mwangi, Samuel C.; Mbatia, Oliver; Nzuma, Jonathan Makau (2013)

This paper evaluates the effects of market reform policies on the volatility of Irish potato prices in Kenya through an analysis of a 20 year monthly time series data set from Nyandarua district using an autoregressive ...
Effects of Exchange Rate Volatility on French Beans Exports in Kenya

Mwangi, Samuel C.; Mbatia, Oliver; Nzuma, Jonathan Makau (Springer, 2014-01)

In Kenya, exports of French beans are one of the leading foreign exchange earners. Nevertheless, the economic impacts of exchange rate volatility on French beans exports in Kenya are unclear. This paper evaluates the ...
Comparative Trapping Efficiency to Characterize Bee Abundance, Diversity, and Community Composition in Apple Orchards

Joshi, N.K.; Leslie, Timothy; Rajotte, Edwin G.; Kammerer, Melaine A.; Otieno, Mark; Biddinger, David J. (Oxford University Press, 2015-07)

Bees are important pollinators of numerous crops, and monitoring their abundance and diversity in commercial agricultural ecosystems is of increasing importance due to pollinator declines. In season-long field studies ...
Effect of decomposition intensity of incorporated chickpea manure on stability and saturated hydraulic conductivity of a clay loam and clay soil

Wakindiki, I.C; Yegon, Rebecca (Academic Journals, 2011-03-04)

The role of organic matter (OM) in soil aggregation and saturated hydraulic conductivity (Ksat) has long been recognised but their depedence on the intensity of decay is less studied. The objective of this study was to ...
The Utility of Aerial Pan-Trapping for Assessing Insect Pollinators Across Vertical Strata

Nuttman, Clive; Otieno, Mark; Kwapong, Peter K.; Combey, Rofela; Willmer, Pat; Potts, Simon G. (2011)

Insect pollinators provide a critical ecosystem service by pollinating many wild flowers and crops. It is therefore essential to be able to effectively survey and monitor pollinator communities across a range of habitats, ...
Tea breaks: how flower visitors can benefit from unplanned floral buffer strips in a Tanzanian tea plantation

Norfolk, Olivia; Sadiki, Lotha Laisser; Broughton, Brittanie; Otieno, Mark; Nuttman, Clive (Blackwell Publishing Ltd, 2013)
A global quantitative synthesis of local and landscape effects on wild bee pollinators in agroecosystems

Kennedy, Christina M.; Lonsdorf, Erick; Neel, Maile C.; Williams, Neal M.; Ricketts, Taylor H.; Winfree, Rachael; Bommarco, Riccardo; Brittain, Claire; Burley, Alana L.; Cariveau, Daniel; Carvalheiro; Chacoff, Natacha P.; Cunningham, Saul A.; Danforth, Bryan N.; Dudenhoffer, Jan-Hendrick; Elle, Elizabeth; Gaines, Hanna R.; Garibaldi, Lucas A.; Gratton, Claudio; Holzschuh, Andrea; Isaacs, Rufus; Javorek, Steven K.; Jha, Shalene; Klein, Alexandra M.; Krewenka, Kristin; Mandelik, Yael; Mayfield, Margaret M.; Morandin, Lora; Neame, Lisa A.; Otieno, Mark; Park, Mia; Potts, Simon G.; Rundlof, Maj; Saez, Agustin; Steffan-Dewenter, Ingolf; Taki, Hisatomo; Viana, Blandina F.; Westphal, Catrin; Wilson, Julianna K.; Greenleaf, Sara S.; Kremen, Claire; Carvalheiro, Luisa G. (Blackwell Publishing Ltd, 2013)

Bees provide essential pollination services that are potentially affected both by local farm management and the surrounding landscape. To better understand these different factors, we modelled the relative effects of ...
The diversity of rural livelihoods and their influence on soil fertility in agricultural systems of East Africa – A typology of smallholder farms

Tittonell, P.; Muriuki, A.; Shepherd, K.D.; Mugendi, Daniel N.; Kaizzi, K.C.; Okeyo, J.; Verchot, L.; Coe, R.; Vanlauwe, B. (2010)

Technological interventions to address the problem of poor productivity of smallholder agricultural systems must be designed to target socially diverse and spatially heterogeneous farms and farming systems. This paper ...

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