John Nyaga

ORCID: 0000-0003-4740-2472
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About
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Research Areas
  • Agriculture and Rural Development Research
  • Agricultural Innovations and Practices
  • African Botany and Ecology Studies
  • Land Rights and Reforms
  • Conservation, Biodiversity, and Resource Management
  • Forest ecology and management
  • Agroforestry and silvopastoral systems
  • Fisheries and Aquaculture Studies
  • Mycorrhizal Fungi and Plant Interactions
  • Agriculture, Land Use, Rural Development
  • Agricultural pest management studies
  • Global Trade and Competitiveness
  • Legume Nitrogen Fixing Symbiosis
  • Innovation and Socioeconomic Development
  • Soil and Environmental Studies
  • Organizational Leadership and Management Strategies
  • Advances in Oncology and Radiotherapy
  • Child Nutrition and Water Access
  • Invertebrate Taxonomy and Ecology
  • Diverse Aspects of Tourism Research
  • Environmental and Agricultural Sciences
  • Microfinance and Financial Inclusion
  • Fungal Biology and Applications
  • Potato Plant Research
  • Indigenous Knowledge Systems and Agriculture

University of Nairobi
2019-2024

World Agroforestry Centre
2015-2024

Kenya Methodist University
2023

Jomo Kenyatta University of Agriculture and Technology
2014-2015

The recent interest in multi-functional agricultural landscapes has not been matched with formal assessment of the roles that trees play across spectrum ecosystem services (ESs) provided Sub-Saharan Africa (SSA). A structured literature review (1995–2014) assessed 350 journal articles about provision one or more ESs by on farms and SSA. This revealed information 15 from studies 23 countries covering arid (1% studies), semi-arid (49%), sub-humid (26%) humid (24%) agro-ecological zones....

10.1080/21513732.2016.1214178 article EN International Journal of Biodiversity Science Ecosystems Services & Management 2016-07-31

The study assesses the gender implications of a target product profile for table potato in Kenya. Breeding programs mostly emphasize farmers’ trait requirements and rarely pay attention to other value chain actors’ preferences. This partially contributes low uptake improved varieties. Therefore, efforts are required assess crop proposals during development, testing, dissemination. In this paper, we traits targeted by breeding program Kenya using G+ tools. applies tool examine instances...

10.3389/fsufs.2024.1331198 article EN cc-by Frontiers in Sustainable Food Systems 2024-07-11

Summary Using quantitative, qualitative and sensorial data collected from western (Kabale) central (Rakai) Uganda, this paper identifies describes gender‐responsive traits preferred in varieties for the boiled potato market. These are aggregated into a product profile to support breeding programme design decision‐making that will increase probability of variety acceptance. An interdisciplinary participatory methodology was used collect on socio‐economic trait preferences, processing...

10.1111/ijfs.14840 article EN cc-by International Journal of Food Science & Technology 2020-10-10

This paper evaluates the determinants of decision-making in relation to production four crops (banana, cassava, potato, and sweet potato). Understanding division labor crop management may lead designing better interventions targeted at improving efficiency smallholder agriculture. In 2014, research team conducted a quantitative household survey with heads households involving 261 women 144 men Burundi 184 222 Rwanda. Most decisions provision during both cash (potato banana) food (sweet...

10.3390/su11164304 article EN Sustainability 2019-08-09

Abstract Decline in soil fertility is a major threat to land productivity and food security the East African highlands. This calls for application of nutrient inputs improve crop productivity. A study was conducted Nyabihu District Rwanda from 2013 2016 assess effect Alnus acuminata green manure (AGM)─applied situ, through biomass alone, or combined with inorganic fertilizer─on profitability maize ( Zea mays ), beans Phaseolus vulgaris potato Solanum tuberosum ). The treatments included AGM,...

10.1186/s43170-024-00271-w article EN cc-by CABI Agriculture and Bioscience 2024-07-27

Using quantitative data from a household survey carried out in Rubanda district, Southwestern Uganda among smallholder farmers of potato, this paper examines determinants intra-household decision-making women relation to pest and disease management cropping season. Pests diseases cause significant crop losses contribute food insecurity most sub-Saharan Africa. Their is therefore key enhancing security. While there are many practises, little known about women's autonomy on topic. The...

10.3389/fsufs.2021.693127 article EN cc-by Frontiers in Sustainable Food Systems 2021-07-23

Fish and fishery products are valuable sources of protein essential micronutrients for balanced nutrition good health. In Kenya, farmed fish is an integral nutrition, income earning employment commodity rural households. 2010, the Government Kenya initiated Economic stimulus program to encourage farming. Farmers took up activity as a source food income. However, where adopted business there were little returns (Kimathi et., al 2013). used diverse marketing channels that apparently posted...

10.22004/ag.econ.249338 preprint EN RePEc: Research Papers in Economics 2016-09-01

<p>Arbuscular Mycorrhizal Fungi (AMF) are important in agriculture and have received attention as they considered a part of an active diverse soil biological community essential for increasing the sustainability agricultural systems. However, most practices negative impact on AMF association soils impoverished. Interventions to replenish include re-introduction through inoculation or manipulation existing increase density. A major problem with is that there possible competition native...

10.56369/tsaes.1851 article EN cc-by Tropical and Subtropical Agroecosystems 2014-04-28

This paper evaluates the determinants of decision making in relation to production four crops (banana, cassava, potato and sweet potato). Understanding division labour decision-making crop management may lead designing better interventions targeted at improving efficiency smallholder agriculture. A household quantitative survey with heads households involving 261 women 144 men Burundi 184 222 Rwanda was conducted 2014. Most decisions provision during both cash (potato banana) food (sweet...

10.20944/preprints201906.0018.v1 preprint EN 2019-06-03
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