Yield stability among cowpea genotypes evaluated in different environments in Uganda

Abstract

Cowpea (Vigna unguiculata) is one of the important legume crops in Uganda especially in the eastern and northern regions. Its productivity in the country is, however, still low. Environmental constraints and occurrence of genotype × environment interactions (G × E) contribute greatly to the low production. In this study, an additive main effects and multiplicative interaction analysis (AMMI) model was used to assess the yield stability of 30 cowpea genotypes planted in five locations for three consecutive seasons. Also, the relationship of G × E interaction with genotypic/weather variables was analysed. AMMI analysis of variance indicated that environment had the highest contribution to the variation in grain yield. Postdictive success method indicated AMM1-3 as the best model since the first three interaction principal component axes (PCA1, PCA2, PCA3) were significant (p = 0.0000). Together, the first three PCAs explained 75.1% of the G × E interaction sum of squares. However, according to the predictive success method, AMMI-1 was the best model. The AMMI stability value (ASV) identified five genotypes; UCR 5279, Ayiyi, IT07K-257-33, ACC122*WC66 and IT06K-281-1 as being more stable. These ABOUT THE AUTHORS Mbeyagala, E. K (PhD) is a Senior Scientist (Legume breeding) working for the National Agricultural Research Organization (NARO) based at the National Semi-Arid Resources Research Institute (NaSARRI). He is currently the leader of the National Dryland Legume Research Program and also heads cowpea, mungbean and pigeonpea breeding activities in Uganda. His research focuses on developing varieties with tolerance/resistance to biotic/abiotic stresses and with acceptable farmer/consumer traits. Ariko, J.

Dual‐purpose cowpea grain and fodder yield response to variety, nitrogen–phosphorus–potassium fertilizer, and environment

“…Mbeyagala et al. (2021) reported a high contribution of environment to variation in grain yield in their study and indicated that high rainfall and moderate temperature are associated with high cowpea yield.…”

“…Relatively greater rainfall and longer growing season constitute greater grain yield environments for cowpea despite the crop being drought resistant compared with most other crops. Mbeyagala et al (2021) reported a high contribution of environment to variation in grain yield in their study and indicated that high rainfall and moderate temperature are associated with high cowpea yield.…”

“…Singh et al (2011) in Nigeria have all reported increases in grain, fodder, as well as the cowpea fodder nutrient concentrations with different fertilizer sources. Furthermore, cowpea genotypes × environment studies revealed site-year and genotypes × environment effects on grain and fodder (Goa et al, 2022;Mbeyagala et al, 2021;Mekonnen et al, 2022). While some studies have explored the effect of selected variety and nutrient rates on cowpea production, to our knowledge, no studies have been conducted to better elucidate the effect of genotypes × environment × management interactions on the performances of cowpea varieties purposely released for dual use in Senegal.…”

Adaptability and yield stability of cowpea genotypes in the Mid-North region of Brazil

“…Studies on adaptability and stability have been conducted using different methodologies, including the Lin & Binns (1998) methodology modified by Carneiro (1998) (Nunes et al, 2014;Santos et al, 2015;Alves et al, 2020) and Theil (1950) methodology (Nascimento et al, 2010). Several studies on this subject have also been reported in the literature using the method of additive main effects and multiplicative interaction -AMMI (Santos et al, 2015;Araméndiz-Tatis et al, 2021;Mbeyagala et al, 2021).…”