A field experiment was conducted at the research station of the College of Agriculture / University of Basra at the site of Garmat Ali, during the growing season 2020-2021 in clay soil to study the effect of the operating pressure of the fixed sprinkler irrigation system, moisture depletion and the degree of soil softening on the growth vocabulary of barley (Hordeum Vulgare L.). Experiment coefficients, which include three main factors, were distributed in the Amelia experiment. The factors were the operating pressure factor, which includes three pressures, 150 kPa (P1), 250 kPa (P2) and 350 kPa (P3), and the moisture depletion factor, which includes the depletion at 75% of ready water (M1) and depletion at 50% of ready water (M2), and the third factor is the soil softening factor by disc harrows, and it includes softening the soil after plowing once (C) and softening the soil three whet (S). The experiment’s parameters were distributed in three replications, using a factorial experiment method using a randomized complete block design (R.C.B.D) for three replicates. The experimental units were planted with barley crop, where irrigation is carried out according to the moisture depletion of the ready water of the soil, in addition to the requirements for washing 20%. The results showed that increasing the operating pressure from P1 to P2 and then P3 and the treatment of moisture depletion (M1) and the treatment of soil with smoothing once (C) were the best results in increasing plant height, spike length, dry weight of the vegetative part and the highest grain yield compared with low operational pressures and treatment M2 and soil softening treatment S

Irrigation by fixed sprinkler, moisture depletion, degree of soil softening, plant height, spike length, dry weight of the vegetative part, yield weight.