The purpose of this experiment was to determine the relationship between the path coefficient and seed rate for four different barley cultivars (Amal, Ibaa 265, Ibaa 99, and Buhooth 244) during the 2019-2020 winter season. The experiment was carried out using a split plot design with three replications according to a randomized complete block design (RCBD). The highest positive thru effect on grain yield was found for flag leaf area and harvest index at aseeding rate of 130 kg.h-1; the highest positive direct effect on grain yield was found for flag leaf area and plant height at aseeding rate of 160 kg.h-1; and the highest positive direct effect on yield was found for biological yield and harvest index at a seeding rate of 190 kg.ha-1. Because of this, it can be used as proof of selective breeding for increased yield in barley by plant breeders.

to This study was carried out in the field of the College of Agricultural Engineering Sciences - University of Baghdad - Jadriya in the win-ter season 2019-2020 in order to study the genetic correlations of four varieties of barley (Amal, Ibaa 265, Ibaa 99, and Research 244) with the effect of three seed rates (130, 160 and 190 kg ha_1). The experiment was applied using the split plot design and with three replications according to the randomized complete block design. The main plots included three seeding rates, while the Sub-plots in-cluded four varieties. The results showed that the genetic correlation was positive and highly significant between the traits of the number of spikes and the trait of the number of grains in the spike with the grain yield and for all seeding rates, so that plant breeders can rely on them as a selective evidence for high yield in barley