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Evaluation of Multi-Environment Forage Yield Trial of Selected Pigeon Pea (Cajanus cajun) Genotypes Grown in Western Oromia, Ethiopia Based on GGE Bi-Plot Model

The narrow genetic variability and incidence of new biotic and a biotic stresses have motivated the introduction, evaluation and selection of superior Pigeon pea genotypes for use as forage for livestock in Ethiopia and the western Oromia as well. Identification of high herbage yielding and stable genotype (G) across environment (E) is challenging because of the complete G x E interaction effects. Thus, the current study aimed to analyze forage yielding performance and yield stability of selected Pigeon pea genotypes tested under different environmental conditions of western Oromia, Ethiopia using GGE bi-plot model. The experiment was laid down in randomized complete block design with three replications. Analysis of variance revealed the existence of significant GE interaction for herbage yield trait. The study result indicates that, the magnitude of environment and year main effects and GE interaction for herbage yield of 10 pigeon pea genotypes tested across locations were much lower than genotypic main effects. The GGE bi-plot model also identified promising genotypes based on the mean yield and stability and best environment based on discriminating ability and representativeness. Accordingly, Degagsa and Belabas genotypes were high yielder and showed consistent performance across testing locations and hence recommended for forage production in western Oromia and similar agro-ecologies to the study area. While, Chewaka location provided high information with regard to the genotype difference as compared to the rest locations and thus can be considered as the best sites for growing adapted Pigeon pea genotypes.