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In order to determine the genotype × environment (GE) interaction and yield stability, an experiment was conducted with 10 promising genotypes of rice and two control variety (Shiroudi and Fajr) in two regions of Mazandaran (Amol , Babol, Sari and Tonkabon) under randomized complete block design with four replications during two cropping seasons (2012-2013). Grain yield was adjusted by 14% moisture content. Analysis of variance showed significant differences for grain yield among genotypes.. Combined ANOVA was also performed following Bartlett test (for uniformity of error variances). Results showed significant differences among the genotypes. The effects of location and year and genotype × location and genotype × year interactions were not significant. It means that the genotypes had similar response over different locations and years. However, the interaction effects of year × location, and year × location × genotype were significant. Stability of genotypes were evaluated using seven different methods including: thevarianceandcoefficient of environmental variability, wricke’s equivalence, Shukla’s stabilityvariance, coefficient of regression, the variance ofdeviation fromregression, within locationvariance. The results showed that genotype No.4 and  control variety Fajr, were determined as stable genotypes, because low S2i, CVi,MSy/p,Qi2and Wi2 and bi equal to unity and non- significant S2di.


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