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When Urban Harvest began its sub-Saharan programme in 2002, scientists in the Consultative Group on International Agricultural Research (CGIAR) knew that crop-livestock interactions intensify with human population densities. However, little was known about the nature of these interactions at the ...


Lee-Smith, D.Karanja, N.Njenga, M.Dongmo, T.Prain, G.[Nutrient cycles in three African cities.]Nutrient cycles in three African cities.

One of the ‘grand challenges’ of this age is the anthropogenic impact exerted on the nitrogen cycle. Issues of concern range from an excess of fixed nitrogen resulting in environmental pressures for some regions, while for other regions insufficient fixed nitrogen affects food security and may le...


Reis, S.Bekunda, Mateete A.Howard, C.Karanja, N.Winiwarter, W.Yan, X.Bleeker, A.Sutton, M.A.[Synthesis and review: tackling the nitrogen management challenge: from global to local scales]Synthesis and review: tackling the nitrogen management challenge: from global to local scales

Even though potato (Solanum tuberosum L.)-based intercropping systems are widely practised in developing countries, only a few studies have focused on legumes as the companion intercrops. This study was conducted to assess the effect of incorporating legumes into the potato production system on g...


Gitari, H.I.Gachene, C.K.K.Kamau, S.Nyawade, S.Sharma, K.Schulte-Geldermann, ElmarKaranja, N.[Optimizing yield and economic returns of rain-fed potato (Solanum tuberosum L.) through water conservation under potato-legume intercropping systems.]Optimizing yield and economic returns of rain-fed potato (Solanum tuberosum L.) through water conservation under potato-legume intercropping systems.
Lagerkvist, C.J.Okello, J.J.Karanja, N.[Evidence from a field experiment in a traditional vegetable market in Kenya][Consumers' evaluation of volition, control, anticipated regret, and perceived food health risk]Consumers' evaluation of volition, control, anticipated regret, and perceived food health risk

Soil erosion rates are exacerbated in sloping arable lands of Central Kenya due mainly to the high soil disturbance caused by potato hilling. A field study was conducted in runoff plots to quantify the effect of potato hilling on soil loss, soil moisture distribution and soil temperature. Three h...


Nyawade, S.Karanja, N.Gachene, C.K.K.Schulte-Geldermann, ElmarParker, M.[Effect of potato hilling on soil temperature, soil moisture distribution and sediment yield on a sloping terrain]Effect of potato hilling on soil temperature, soil moisture distribution and sediment yield on a sloping terrain

Competition for nitrogen (N) and phosphorous (P) under potato-based intercropping systems decreases the level of nutrients available for potato and subsequently influences nitrogen and phosphorous use efficiency. A field trial was conducted for four consecutive seasons between 2014 short rains an...


Gitari, H.I.Karanja, N.Gachene, C.K.K.Kamau, S.Sharma, K.Schulte-Geldermann, Elmar[Nitrogen and phosphorous uptake by potato (Solanum tuberosum L.) and their use efficiency under potato-legume intercropping systems]Nitrogen and phosphorous uptake by potato (Solanum tuberosum L.) and their use efficiency under potato-legume intercropping systems

Bacterial wilt disease, race 3 biovar 2A, is a devastating disease of potato and other important solanaceous crops, with no chemical control method. The current studies were, therefore, undertaken to assess the efficacy of biocontrol agent (BCA) and organic amendments to manage bacterial wilt (BW...


Aguk, J.A.Karanja, N.Schulte-Geldermann, ElmarBruns, C.Kinyua, Z.Parker, M.[Control of bacterial wilt (Ralstonia solanacearum) in potato (Solanum tuberosum) using rhizobacteria and arbuscular mycorrhiza fungi.]Control of bacterial wilt (Ralstonia solanacearum) in potato (Solanum tuberosum) using rhizobacteria and arbuscular mycorrhiza fungi.
Njenga, M.Karanja, N.Prain, G.Lee-Smith, D.Pigeon, M.[Gender mainstreaming in organisational culture and agricultural research processes.]Gender mainstreaming in organisational culture and agricultural research processes.

Cryptosporidium parvum is an emerging disease which is of particular concern because of its ability to contaminate milk, food-crops and water sources; to persist in the environment; to survive water treatment including chlorination; and to cause serious and sometimes fatal disease in children and...


Grace, DeliaRandolph, Thomas F.Karanja, N.Kang'ethe, Erastus K.[Modular process risk models for better management of Cryptosporidium parvum - An emerging zoonotic pathogen]Modular process risk models for better management of Cryptosporidium parvum - An emerging zoonotic pathogen

This paper characterises the dairy farming system in Dagoretti, Nairobi. Characterisation was part of a broader ecohealth project to estimate the prevalence and risk of cryptosporidiosis and develop risk mitigation strategies. In the project a trans-disciplinary team addressed epidemiological, so...


Kang'ethe, Erastus K.Kimani, V.N.McDermott, B.Grace, DeliaLang'at, A.K.Kiragu, M.W.Karanja, N.Njehu, A.N.Randolph, Thomas F.Mbugua, G.Irungu, T.W.Ombutu, P.[A trans-disciplinary study on the health risks of cryptosporidiosis from dairy systems in Dagoretti, Nairobi, Kenya: Study background and farming system characteristics]A trans-disciplinary study on the health risks of cryptosporidiosis from dairy systems in Dagoretti, Nairobi, Kenya: Study background and farming system characteristics

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