1West Africa Centre for Crop Improvement, School of Agriculture, College of Basic and Applied Sciences, University of Ghana, PMB 30, Legon, Ghana
2International Institute of Tropical Agriculture, PMB 5320, Oyo Road, 200001, Ibadan, Nigeria
Department of Crop Science, School of Agricultural Sciences, College of Natural Resources and Environmental Studies, University of Juba, P.O. Box 82, Juba, South Sudan
*Corresponding author's e-mail: jeleblu@wacci.ug.edu.gh
Online published on 22 January, 2020.
Twenty-five cowpea (Vigna unguiculata L.) genotypes were evaluated across six contrasting environments for phenotypic yield stability. Combined analysis of variance revealed significant differences among the genotypes and the main effects. A1B×D, BC×M, L1B×M, A1B×M, and BA×I were the best performing and stable genotypes. The non-parametric analysis showed that genotype IT93K-503-1 had the highest yield and BC×D had the lowest yield. Shukla stability analysis revealed Beledi A and Dan lla as the most stable across test environments and genotypes A1B×D, BC×M and BA×I were good performers. The coefficient of variability graphical approach showed that genotypes BC×I, A1B×M, A1B×D, Dan lla, TA×M, Mouride, L1B×I, BC×M and L1B×D were high yielding. This implies they would do well across the testing sites. However, genotype IT93K-503-1 should be promoted for cultivation in drought-prone environments.
Adaptability, Cowpea, Environment, Genotype, Stability, Yield
