African Journal of
Agricultural Research

  • Abbreviation: Afr. J. Agric. Res.
  • Language: English
  • ISSN: 1991-637X
  • DOI: 10.5897/AJAR
  • Start Year: 2006
  • Published Articles: 6559

Full Length Research Paper

Grain yield adaptability and stability of blackeyed cowpea genotypes under rainfed agriculture in Brazil

Hendrie Ferreira Nunes1*, Francisco Rodrigues Freire Filho2, Valdenir Queiroz Ribeiro2 and Regina Lúcia Ferreira Gomes3
1Av. Dois Córregos, 4455 Piracicaba-SP. CEP: 13423-100, Brazil, 2Av. Duque de Caxias, 5650 Teresina-PI CEP: 64006-220, Brazil, 4Campus Socopo, S/N Teresina-PI CEP: 64049-550, Brazil,
Email: [email protected]

  •  Accepted: 18 December 2013
  •  Published: 08 January 2014

Abstract

The present study aimed to evaluate the grain yield adaptability and stability of 20 blackeyed cowpea genotypes under rainfed agriculture in North, Northeastern and Central/Western Brazil. Three parametric methodologies and one non-parametric methodology were used. We found significant differences among genotypes, environments, and interaction between genotypes and environments. The traditional method indicated that the MNC05-832B-230-2-3 line was the most stable but had low grain yield. The linear regression indicated that the California Blackeye-3 and California Blackeye-5 cultivars had wide adaptability and stability. The bi-segmented regression model indicated that the MNC04-783B-7-3 and California Blackeye-3 genotypes exhibited adaptation to favorable and unfavorable environmental conditions, respectively. The non-parametric method characterized the MNC04-783B-7-3 line as the most suitable and stable genotype. Spearman´s rank correlation showed that some methodologies should not be used simultaneously and that others should be used complementary to each other.

 

Key words: Vigna unguiculata, genotype × environment interaction, non-parametric method, parametric method, seed yield.