Nigeria
The Federal Republic of Nigeria /naɪˈdʒɪəriə/, commonly referred to as Nigeria, is a federal constitutional republic in West Africa, bordering Benin in the west, Chad and Cameroon in the east, and Niger in the north. Its coast in the south lies on the Gulf of Guinea in the Atlantic Ocean. (Source: DBpedia)
JIRCAS Report
TERRA Africa Project FY2025 Holds Activity Report Meeting – Towards “Technology Establishment for Regional-adapted Regenerative Agriculture in Africa”
From February 17 to 18, 2026, the “TERRA Africa Project FY2025 Activity Report Meeting” was held at the University for Development Studies (UDS) in Tamale, Northern Ghana. A total of 54 participants attended, including researchers from JIRCAS, UDS, and the Savannah Agricultural Research Institute (SARI), as well as representatives from the Sasakawa Africa Association (SAA) and The Nippon Foundation.
Senior Researcher ISEKI Kohtaro Receives Best Research Award at the International Symposium on Tropical Root and Tuber Crops
Dr. ISEKI Kohtaro, Senior Researcher in the Biological Resources and Post-harvest Division, received the Best Research Award at the “International Symposium on Tropical Root & Tuber Crops for Nutrition, Agri-food Systems, Resilience, Entrepreneurship and Sustainability,” held in Thiruvananthapuram, India, from November 17 to 21, 2025.
Information Analysis
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Pick Up541. Elucidating the Relationship Between Flowering Sex and Yield of White Guinea Yam― Towards the Development of Efficient Cultivation Methods―
White Guinea yam is widely grown in the West African coastal region (Guinea Savanna) and is an important crop that supports food supply and demand in this region. However, the labor-intensive cultivation of white Guinea yams is a major burden on farmers. In collaboration with the International Institute of Tropical Agriculture (IITA) in Nigeria, JIRCAS has now clarified the effect of flowering sex on tuber yield of white Guinea yam, which has not been well understood for a long time. This achievement reveals the possibility of yield improvement through flowering control in yams. -
Publication
Field manual for rapid and non-destructive shoot biomass evaluations of staked yam
Kohtaro ISEKI, Ryo MATSUMOTO, Manual and Guideline. ( )
manual_guideline-_-.pdf4.5 MB
Field manual for the rapid estimation of cowpea leaf stomatal conductance
Kohtaro ISEKI, Olajumoke Olaleye, Manual and Guideline. ( )
manual_guideline305-_-.pdf1.75 MB
砂漠化および塩類化に関する研究の現状 (第14回熱帯農業専門分野別研究会--地球の砂漠化・塩類化を考える)
尾和 尚人, 熱帯農研集報. 74 , 1- 8 ( )
アフリカの農林業及び農林業研究実態調査 : ザイール・ベニン・ブルキナファソ・ナイジェリア
日高輝展, 沢田治雄, 熱研資料. 90 ( )
nekken_shiryo90-_-.pdf33.93 MB
アフリカの水文環境と灌漑開発
北村義信, 熱研資料. 89 ( )
nekken_shiryo89-_-.pdf21.94 MB
Research Highlights
- Enhancing yam yield through strategic planting: a climate-resilient approach(2024)
- Enhancing leguminous crop production in semi-arid regions with low-grade phosphate rock as an affordable fertilizer alternative(2024)
- Selection of a Diversity Research Set to facilitate efficient genetic and breeding studies of Guinea yam (Dioscorea rotundata)(2020)
- A new indicator of leaf stomatal conductance based on thermal imaging(2019)
- SSR marker technology package for variety identification of white Guinea Yam(2019)
- Non-destructive shoot biomass evaluation for field-grown staking yam (Dioscorea rotundata Poir)(2018)
- Limited Si-nutrient status of rice plants in relation to plant-available Si of soils, nitrogen fertilizer application, and rice-growing environment across Sub-Saharan Africa(2013)
- Screening cowpea for drought tolerance(1995)