ESTIMATION OF SOME GENETIC PARAMETERS FOR BREAD WHEAT (T. AESTIVUM L.)

This study was conducted in the waterfalls area to the north of Mosul for the season (2019-2020), where the experiment included two factors, the first of which included five cultivars of bread wheat obtained from the Salah al-Din Seed Examination and Certification Department (IPA 99, July 2, Adnaniya, Abu Ghraib 3, Sham 6). The second has three seeding rates, which are (200, 250, 300) seeds/m(2) and the planting was done on lines with a length of 2.5 m and the distance between one line and another is 30 cm using the Randomized complete block design (RCBD) with three replications to study the changes in the nature of plant growth for yield and its components. The components of genetic, phenotypic, environmental and broad sense heritability and the expected genetic improvement among the character were estimated. The results showed significant differences between all cultivars and for all studied characters at the level of 1%. The values of genetic variance were higher than the values of environmental variance for all the studied characters, while the values of the coefficients of genetic and phenotypic variation for the studied character varied. The values of heritability in the broad sense were high for all characters and the expected genetic improvement was low for plant height (cm) and spike length (cm).