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Solomon Kamau
University of Nairobi
9Publications
5H-index
40Citations
Publications 9
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
view all 5 authors...
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...
#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 ...
#1Nictor Namoi (World Agroforestry Centre)H-Index: 3
#2David E. Pelster (ILRI: International Livestock Research Institute)H-Index: 13
Last.Edmundo Barrios (World Agroforestry Centre)H-Index: 25
view all 7 authors...
Soils account for >80% and 20% of the total agricultural N2O and CO2 emissions respectively. Soil management activities that target improved soil health, such as enhancing earthworm activity, may also stimulate further emissions of CO2 and N2O. One recommended strategy for mitigating these soil emissions is biochar amendment. However greater clarity on the interaction between earthworm activity and biochar, and subsequent impact on CO2 and N2O are needed to evaluate the environmental impacts of ...
#1Harun I. Gitari (KU: Kenyatta University)H-Index: 3
#2Ckk Gachene (UoN: University of Nairobi)H-Index: 14
Last.Elmar Schulte-Geldermann (CIP: International Potato Center)H-Index: 6
view all 6 authors...
Aims To assess the effects of potato-legume intercropping on selected soil physical and chemical properties after four consecutive growing seasons (from the short rains in 2014 to long rains 2016).
#2Nancy KaranjaH-Index: 19
Last.M. ParkerH-Index: 3
view all 9 authors...
A paper presented at the Eleventh triennial African Potato Association (APA) Conference, August 25–29, 2019. Kigali, Rwanda
#1Harun I. Gitari (UoN: University of Nairobi)H-Index: 3
#2Ckk Gachene (UoN: University of Nairobi)H-Index: 14
Last.Elmar Schulte-Geldermann (CIP: International Potato Center)H-Index: 6
view all 7 authors...
Abstract 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 ground cover, soil moisture content (SMC), tuber and legume yield, potato equivalent yield (PEY), gross and net income and benefit: cost ratio (BCR). The treatments comprised of pure potato stand...
#1Harun I. Gitari (UoN: University of Nairobi)H-Index: 3
#2Nancy N. Karanja (UoN: University of Nairobi)H-Index: 5
Last.Elmar Schulte-Geldermann (CIP: International Potato Center)H-Index: 6
view all 6 authors...
Abstract 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 and 2016 long rains to assess the effect of incorporating legumes as intercrops into potato cropping systems on N and P uptake and uptake efficiency by the potato crop and nutrient use efficiency....
#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
view all 5 authors...
Abstract The charcoal sector constitutes an important source of employment and revenue for many tropical agroecosystems. Better understanding of the effects of charcoal-making is thus warranted to guide actions aimed at minimising environmental externalities. Conversion of trees to charcoal eliminates canopy effects associated with the living trees while at the same time creates new conditions in and around spots where the charcoal is produced due to increased concentration of pyrogenic organic ...
#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
view all 5 authors...
Abstract Soil macrofauna contribute to key soil functions underpinning soil-mediated ecosystem services. There is limited understanding about the role of trees as ‘resource islands’ for soil macrofauna in agricultural landscapes and how this interaction is affected by soil degradation status. The study assessed the spatial influence of three dominant trees namely, Croton megalocarpus , Eucalyptus grandis and Zanthoxylum gilletii , on soil macrofauna abundance, along a soil degradation gradient r...
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