Abstract

Objectives: to analyze the genetic stability of three barley cultivars under the influence of different levels of nitrogen fertilizer to identify the variety or varieties that have genetic stability. Methods: At the Agricultural Research Station in Karma Ali, College of Agriculture at the University of Basrah, a field experiment was carried out in the Basrah Governorate during the 2021-2022 winter season The experiment was done using a split-plot design with three replications. The main plots showed the number of harvests (once, twice, or three times), which were shown by (C1, C2, C3). The secondary plots showed the crops (Baraq, Abaa 99, Abaa 265), which were shown by (V1, V2, V3). The sub-plots showed the amounts of fertilizer (300, 200, 100) N ton ha-1and symbolized by (N1, N2, N3). Results: The results showed that the values of phenotypic variances were highly significant compared to the genetic and environmental variances, the studied traits. Green and dry food yield, protein yield, and inheritance in a broad sense all had high values of 88.86%, 75.28%, and 82.45%, respectively due to the decrease in the values of environmental variance compared to the values of genetic variance. The phenotypic and genetic variation coefficients were low for the trait of fiber yield. The genetic variation coefficient for the trait of green forage yield was low, reaching 9.567%, and average for the rest of the studied traits. Conclusions: Also can note that the variety V1 is more stable for the trait.