Grain Yield Stability Evaluation In Field Pea Using AMMI Model in the Highlands of Bale, Southern Ethiopia

To identify high yielding and stable field pea genotypes in the highlands of bale, twelve field pea genotypes were evaluated at three locations, Sinana, Goba and Agarfa in the highlands of Bale southeastern Ethiopia, for three consecutive years 2022-2024 cropping season using randomized complete block design with three replications. The combined analysis over locations and years revealed significant variation of mean grain yield for genotypes, environments and genotype by environment interaction at P<0.01. The AMMI analysis also revealed significant variation for all AMMI components. The genotypes contributed about 59.32% of the total sum squares followed by environment which is responsible for 22.09% of the total sum square and 18.60% of the variation is accounted due to genotypes by environment interaction. The first AMMI1 is accounted for 43.07% of the interaction sum of square whereas the second AMMI components accounted for 23.56% variation of the interaction sum of square. The two components cumulatively accounted for 66.63% of the variation of the interaction sum of square. Using AMMI Stability Value (ASV) G4, G11, G8, and G10 are considered as stable genotypes. Since the most stable genotypes are not high yielder, the GSI revealed G10, and G11 are the stable once whereas G7 and G8 are moderately stable. Since G7 and G10 having high mean grain yield over the checks with yield advantage of 22.4 and 13.4, respectively and also showed stable performance over the testing environments, they have been identified as candidate genotypes to be verified for possible release for the highlands of bale and similar agro-ecologies.