Publication: Yield stability and farmer preference of cowpea (Vigna unguiculata) lines in semi-arid eastern Kenya
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total downloadsDate
2019
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Funder
Aliance for Green for Revolusion of Africa (AGRA),USAID
Publisher
Afrika Focus
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Abstract
Stability in yields of agronomically acceptable cultivars is generally regarded as the ultimate goal in
cowpea improvement. Nine advanced cowpea lines and 3 local checks were evaluated for grain yield
in eastern Kenya with the aim of identifying stable genotypes and integrating farmer preferences.
The study was conducted in 3 locations over 2 years under a randomized complete block design
with 3 replications. Stability was estimated using additive main effects and multiplicative interaction
(AMMI) and genotype by environment (GGE) models. There was variation among genotypes, locations and their interactions for grain yield. Genotype G5, G9 and G2 were found to be stable and high
yielding. Environments Kit16 and Kit15 were considered as the most suitable for selecting superior
genotypes for adaptability and stability. Farmers’ criteria for selecting genotypes included early
maturing, pod length, disease tolerant and high yielding varieties. Cowpea performance for grain yield
was greatly influenced by inherent genotypic factors, environment and their interaction effects
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Keywords
Cowpea, Environment, Genotype by Environment interaction, Stability, Grain yield