The effect of fungal fertilizers with isolates of T. harzianum and G. mosseae and levels of phosphate rock on NPK content in the barley plant was investigated. A field trial was conducted on clay loamy soil to produce a variety of barley crops named (Samir 1) during the autumn agricultural season in 2021 in the Al-Qadisiyah Governorate. The factorial experiment was designed according to a Randomized Complete Block Design (RCBD) with three replications. The factors of the experiment included two levels of T. harzianum inoculum (T0, control and T1, fungal inoculation), two levels of G. mosseae inoculum (G0, control and G1 fungal inoculation), and four levels of phosphate rock (P0, P1, P2, and P3) with an amount (0,1000,1500, and 2000) t/ha-1. The results present that the interaction treatment (G. mosseae + T. harzianum and phosphate rock of 1000 t/ha-1) resulted in a significant increase in the content of nitrogen, phosphate, and potassium (NPK) in the plant 1.977, 0.437, and 2.603 %, respectively, compared to the control.

When it comes to increasing crop yields, biological fertilizers are crucial. So, researchers looked into how different concentrations of phosphate rock and T. harzianum and G. mosseae fungal fertilizers affected NPK availability in the rhizosphere of a barley crop. In the fall of 2021, farmers in the Al-Qadisiyah Governorate tested out a new barley variety they’d come up with, calling it “Samir 1,” on clay loamy soil. A randomized complete block design (RCBD) with three replicates was used to create the factorial experiment. The experiment used four different doses of phosphate rock (P0, P1, P2, and P3) at concentrations of (0,1000,1500, and 2000) t/ha-1, as well as two doses of T. harzianum inoculum (T0, control; T1, fungal inoculation); and two doses of G. mosseae inoculum (G0, control; G1, fungal inoculation). According to the findings, nitrogen, phosphate, and potassium (NPK) availability in the soil were significantly increased by 41.32, 16.54, and 225.43 mg/kg/soil-1 in the interaction treatment compared to the control.