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Nancy Karanja
University of Nairobi
194Publications
19H-index
1,459Citations
Publications 196
Newest
#1Solomon Kamau (UoN: University of Nairobi)H-Index: 5
#2Edmundo Barrios (World Agroforestry Centre)H-Index: 25
Last.Johannes Lehmann (Cornell University)H-Index: 81
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Abstract Soil organic matter (SOM) is considered an important determinant of soil fertility in tropical agroecosystems. While numerous studies have shown the value of agroforestry in increasing soil nutrients and improving crop yield, few have addressed the systematic impacts of duration of cultivation on soil aggregation and C storage in such systems. A study was conducted in South Nandi (Kenya) to assess spatial influence of three dominant trees (Croton megalocarpus, Eucalyptus grandis and Zan...
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AbstractPhosphorus (P) is an essential element and its efficient use is of global importance. This study evaluated the effect of growing potato under legume intercrops on P uptake and use efficienc...
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#1David Guerena (Cornell University)H-Index: 6
#2Johannes Lehmann (Cornell University)H-Index: 81
Last.Henry Neufeldt (World Agroforestry Centre)H-Index: 24
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Abstract Over the past few decades elite strains of rhizobia have become commercially available for agricultural production. However, these elite rhizobia are often not as competitive as native strains under adverse edaphic conditions, primarily concerning tolerance to soil desiccation. Biochar has been proposed as a soil amendment to reduce water stress. The effect of biochar made from sugar cane bagasse on rhizobium survival and inoculation of beans was tested in comparison to uncharred sugarc...
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#1Solomon Kamau (UoN: University of Nairobi)H-Index: 5
#2Nancy Karanja (UoN: University of Nairobi)H-Index: 19
Last.Johannes Lehmann (Cornell University)H-Index: 81
view all 4 authors...
Use of inorganic fertilizers in smallholder cropping systems in Africa is often becoming inefficient due to increasing unresponsiveness to fertilizer application. A study was conducted for 2 years (four seasons) to assess the effects of biochar made from Prosopis juliflora (Sw.) DC. biomass on nutrients, fauna abundance and subsequent influence on maize planted in a nitisol. There were 12 amendments comprising: (i) biochar applied alone at a rate of 5 and 10 Mg ha−1; (ii) three fertilizer types ...
1 CitationsSource
Eradicating poverty and achieving food and nutrition security in a sustainable environment is difficult to achieve without adequate access to affordable cooking fuel. It is therefore important to understand the common sources of cooking energy used by people in rural areas and the challenges faced in making fuel sources economically viable, socially acceptable and ecologically sustainable. In the sub-Saharan Africa (SSA) region, more than 90% of the population relies on firewood and charcoal (wo...
1 CitationsSource
#2Nancy KaranjaH-Index: 19
Last.M. ParkerH-Index: 3
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A paper presented at the Eleventh triennial African Potato Association (APA) Conference, August 25–29, 2019. Kigali, Rwanda
1 CitationsSource
#1Collins O. Oduor (UoN: University of Nairobi)
#2Nancy Karanja (UoN: University of Nairobi)H-Index: 19
Last.Gert Nyberg (SLU: Swedish University of Agricultural Sciences)H-Index: 12
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Background Pasture enclosures play an important role in rehabilitating the degraded soils and vegetation, and may also influence the emission of key greenhouse gasses (GHGs) from the soil. However, no study in East Africa and in Kenya has conducted direct measurements of GHG fluxes following the restoration of degraded communal grazing lands through the establishment of pasture enclosures. A field experiment was conducted in northwestern Kenya to measure the emission of CO2, CH4 and N2O from soi...
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#1C.O. Oduor (UoN: University of Nairobi)H-Index: 1
#2Nancy Karanja (UoN: University of Nairobi)H-Index: 19
Last.Gert Nyberg (SLU: Swedish University of Agricultural Sciences)H-Index: 12
view all 6 authors...
Rehabilitation of degraded rangelands through the establishment of enclosures (fencing grazing lands) is believed to improve soil quality and livelihoods, and enhance the sustainability of rangelands. Grazing dominated enclosure (GDE) and contractual grazing enclosure (CGE) are the common enclosure management systems in West Pokot County, Kenya. Under CGE, a farmer owning few animals leases the enclosure to households with relatively more livestock, while GDE is where the livestock utilizing the...
1 CitationsSource
#1Leilah KrounbiH-Index: 1
#2Harold M. van EsH-Index: 22
Last.Johannes LehmannH-Index: 81
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Human waste contains ample plant-available nitrogen (N) and phosphorus (P), which can be used to address soil nutrient deficiencies. Biological and thermochemical sanitization methods have been proposed for safely treating the solid fraction of human waste (called human solid waste [HSW] in this study) but have rarely been compared directly. Furthermore, interactions between amendments and soil properties are also unclear, as pH, texture, and the presence of oxides all affect N and P availabilit...
1 CitationsSource
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