Abstract
A factorial experiment was conducted in Kirkuk govemorate, in which six introduced hybrids (DK 6050, Gimbson, ZP707, ZP6263, Saganto, Glorya) were used, purchased from local markets, and four chemical herbicides (Turkish Nicosulfuron, Rimsulfuron, Atrazine 80%, Nicosulfuron Chinese), as well as a comparison treatment that was purchased from the different original to study growth traits and yield its compound, the effect of each cross, estimation of variances, coefficients of variation, heritability, expected genetic improvement, genetic, environmental and phenotypic correlations for the of herbicides. The results showed that there were significant differences between hybrids in all traits except for the number of grains per ear, index of harvest, and selling %. The highest hybrid ZP707 was in the traits of plant height, ear leaf area, number of ear per plant, ear length, number of grains per row, number of grains per row, number of grains per row, ear weight, biological yield, harvest index and grain yield per plants, as it reached 183.03, 412.00, 1.14, 19.18, 36.97, 568.86, 221.27, 368.39, 59.85 and 205.45, respectively. The genetic correlation of grain yield plant was significant with all traits except the number of leaves per plant, weight of 300 grains, selling %, protein %, and hectoliter, which amounted to -0.406, - 0.385, -1.231, -0.466, -0.546 and -0.807 respectively. The phenotypic correlation of grain yield per plant was significant with all traits except for the number of leaves per plant, the weight of 300 grains, selling %, protein %, and hectoliter, as it amounted to -0.401, -0.332, -0.652, -0.424, -0.514 and -0.652, some of them were not significant and other Negative significant. The environmental correlation of grain yield with the plant was significant with some characteristics such as ear leaf area, number of ears per plant, number of rows per ear, ear weight, and biological yield, which amounted to 0.746, 0.555, 0.542, 0.663, and 0.509, respectively. The highest genetic and phenotypic difference coefficient for a number of grains per ear was 13.80 and 14.37, and the heritability was high in all traits except harvest index and grain yield per plant, which was medium, amounting to 40.15 and 50.35, and selling % and protein % was low, which reached 14.60 and 35.46 respectively, and highest expected genetic improvement for a number of grains per ear was 27.31.