Stability of grain and fodder yields in extra-early cowpea genotypes in Southeastern Niger

Souleymane Abdou and Abdoul Moumouni Iro Sodo

PLOS ONE, 2026, vol. 21, issue 7, 1-19

Abstract: Cowpea [Vigna unguiculata (L.) Walp.] is a vital food and fodder crop in Niger, but its productivity is constrained by drought, poor soils, striga and pest pressures. Developing extra-early dual-purpose varieties is essential for strengthening food and feed security in these fragile production zones. This study evaluated the effects of genotype, environment, and their interaction on the stability of grain and fodder yields in 21 cowpea genotypes tested across six environments using an alpha-lattice design with three replications. Stability was assessed through Shukla’s stability variance, the cultivar superiority index, Wricke’s ecovalence, GGE biplot, and the multi-trait genotype–ideotype distance index (MGIDI). Results revealed significant differences among genotypes, environments, and genotype × environment interactions for all traits; environmental effects had the highest mean squares for all traits (p

Date: 2026
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Persistent link: https://EconPapers.repec.org/RePEc:plo:pone00:0354617

DOI: 10.1371/journal.pone.0354617

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