Abstract:
The objective of this study was stability parameters estimation
of orchardgrass ecotypes in order to identify stable ecotype for seed yield
in Erzurum ecological condition in Turkey. The experiment was conducted in terms
of randomized complete block design with three replications. Plant materials
were seeds collected from 16 promising lines obtained from different local orchardgrass
ecotype populations (Oltu and Ulubag) along with standard local variety (control)
for seed yield. In order to estimate stability parameters, different methods
have been used including mean yield, environmental variance (Si2,
genotypic Coefficient of Variation (CVi, ecovalence (Wi2),
stability variance (σi2), regression coefficient
(bi), mean of regression deviation (Sdi2) mean
variance (