Genotype by Environment Interaction and Stability Analysis of Dolichos Lablab (Lablab purpureus) Genotypes for Forage Biomass and Seed Yields in Lowlands of East Hararghe Zone of Oromia, Ethiopia

Introducing lablab to mixed farming systems would improve feed supply, and could be a robust option for sustainable intensification. Thus, the study was conducted to evaluate and identify stable and high-yielding genotypes of Lablab purpureus for herbage dry matter yield, seed yield, nutritional quality, and disease and pests tolerant. Eleven lablab genotypes and one standard check (Gebi-17) were used in the experiment at each testing site. The genotypes were arranged in a randomized complete block design (RCBD) with three replications. The combined analysis of variance for herbage dry matter yield, plant height, seed yield over six locations showed highly significant (p<0.001) variation due to genotypes by environment interaction. Accordingly, among the lablab genotypes tested, ILRI-14490 genotype performed well over other lablab genotypes in terms of mean herbage dry matter and seed yields across all locations. This genotype had dry matter and seed yield advantages of 14.3% and 20.22%, respectively, over the standard check (Gebis-17). It was also tolerant to diseases and pests in the study areas. The current study also stated that the crude protein content of the lablab genotypes obtained (25.41-33.3%) was found to be adequate and satisfactory. Hence, ILRI - 14490 was found to be the most stable across locations, high yielding and quality and disease-tolerant genotype. Therefore, based on its yield and stability genotype ILRI–14490 was promoted to Variety Verification Trial for possible release and registration of improved lablab variety.