Validation trial of improved yam varieties in Nigeria in 2017

The average yam yields of local varieties is less than 25% of the yield of improved released varieties, which range from 30 to 40 tons/ha. Absence of a formal seed system has not encouraged the promotion and adoption of released improved yam varieties. To sensitize farmers on the superiority of improved varieties, seed tubers of selected released varietiesproduced by IITA were planted in comparison with local checks in 80 on-farm validation/demonstration trials in six states of Nigeria - Enugu, Benue, Nasarawa, Federal Capital Territory (FCT), Niger and Oyo. Three improved yam varieties [two Dioscorea rotundata (TDr 89/02665 and TDr 95/19177) and one D. alata (TDa 98/01176)], and one location specific farmers’ best variety were used to quantify the superiority of the improved varieties over the locals.

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Additional Info

Field Value
Creator Aighewi, Beatrice
Creator Affiliation International Institute of Tropical Agriculture (IITA)
Creator ID Type ORCID
Creator ID 0000-0002-9398-1674
Subject Vocab (AGROVOC/GACS/CAB) Yam, Nematode, Mealybugs, Harvesting, Beetles, Insects, Skin, Weight, Tubers
Subject(s) Ware yam, Quality seed production
Publisher International Institute of Tropical Agriculture (IITA)
Contributor Person Norbert Maroya
Contributor Role Supervisor
Contributor Project Lead Organisation Center International Institute of Tropical Agriculture (IITA)
Contributor Project Lead Center International Institute of Tropical Agriculture (IITA)
Contributor CRP CGIAR Research Program on Roots, Tubers and Banana(RTB)
Contributor Partner Not applicable
Contributor Donor Bill and Melinda Gates Foundation (BMGF)
Contributor Project Yam Improvement for Income and Food Security in West Africa (YIIFSWA)
Project ID PJ-001325
Contributor Affiliation International Institute of Tropical Agriculture (IITA)
Open-Access status Open Access
Production Date 2017-03-07
Embargo End Date 2021-11-24
Content Type Dataset
File Format csv
Identifier Type DOI
Identifier https://doi.org/10.25502/sp4n-pc47/d
Identifier Citation
Source Yam Improvement for Income and Food Security in West Africa (YIIFSWA)
Language English
Relation Not applicable
Agroecological Zone Subhumid warm tropics
Coverage Region Western Africa
Coverage country Nigeria
Coverage Admin Unit Not applicable
Coverage Y (Latitude) 9.06433, 7.37775, 6.55361, 7.35057, 9.93261, 12.44184
Coverage X (Longitude) 7.4893, 3.89725, 7.41431, 8.77729, 5.65111, 4.22437
Coverage Start Date
Coverage End Date
Contact Aighewi, Beatrice; International Institute of Tropical Agriculture (IITA)
Contact Email B.Aighewi@cgiar.org
Restriction CC-Zero
Email Permission Not applicable
Rights CC-Zero