Evaluation of herbage yield stability in several accessions of Agropyron trichophorum in drought stress and non-stress environments, using AMMI model and other stability analysis methods

Dry forage yield of 24 accessions of Agropyron trichophorum were investigated by a randomized complete block design with three replications at two environments of normal irrigation and rainfed conditions for two years at Islam Abade Gharb research station, Kermanshah, Iran. Analysis variance showed significant variation (P>0.01) between the studied accessions and the environments. Interaction effect of accession×environment was significant at 1% level. Two, interaction principal components from AMMI, analysis expressed 96.77% of the interaction variance and were significant at 1% level. The accessions of 12-13, 313, 314, 8-4, 10-7 and 7-5 were classified as superior accessions for dry forage yield based on Duncan's test (p