Özet:

The research was conducted to evaluate stability of eight genotypes of Flax (Linum usitatissimum L.) (Sakha 1, Sakha 2, Sakha 3, Sakha 5, Sakha 6, Giza 8, Syrian and Poloni) which was cultivated in the research station of the Field Crops Department of the College of Agriculture - Tikrit University during the season (2019/2020) in six agricultural environments, which is the combination of two agricultural distances (5 and 10 cm) and three planting dates, it was applied according to the split-plot system in the Randomized Complete Block Design (RCBD). With three replicated, the plants were divided into separate plot by four lines for each genotype in each environment, where the line length (2 m) and the distance between the lines was (0.40 m), The main plots contained agricultural environments and subplot of genotypes, and the study included thirteen traits , which are duration to 50% flowering, plant height, number of vegetative branches, number of capsules per plants, number of seeds per capsule, yield of seeds per plant, weight of 1000 seeds, average leaf weight, biological yield, leaf percentage, seed yield, and harvest index. The results of the analysis of variance of Genotype x environment interaction showed that the mean of the environments squares (E) were significant at the level of probability (1%) for the duration to 50% flowering, plant height, duration to maturity, number of vegetative branches, number of capsules, biological yield and seed yield, and the statistical significance limit was not reached for the rest of the traits. As for the squares mean of genotypes (G), it was significant about the level of probability (1%) for most of the traits under study and at (5%) for the average trait of leaf weight except for the trait of percentage of leaves was not significant, As for that due to the interaction of genotypes x environments (G × E) was significant at the level of probability (1%) for the recipe, the seed yield by the plant, the weight of 1000 seeds, and the seed yield and the evidence of harvesting did not reach the limit of significance for the rest of the traits studied, and the results showed that the squares mean of the environments (linear) was significant at a 1% probability level for all traits and at 5% for the average leaf weight trait, it is not significant for the number of seeds per capsule, and that the mean of the linear component squares of interaction genotypes x environments when tested against pooled deviation was significant for all traits and was non-significant for the number of capsules per plant, number of seeds per capsule and average leaf weight, The results of the stability parameters showed that some genotypes were suitable and stable for some approved agricultural environments, for the duration traits to 50% flowering, plant height, number of vegetative branches, number of capsules per plant, number of seeds per capsule, and biological yield.

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