Main Article Content
A field experiment was carried out at the second research station located in Al Bandar affiliated to the College of Agriculture / Al-Muthanna University. The experiment included two factors and three replications. The first factor included three treatments, which are: comparison without adding organic fertilizer (C), aerobic decomposing (A) and anaerobic decomposing (An). The second factor included 3 irrigation water treatments, which are: Euphrates water (E), Euphrates water used in biogas purification (P) and Euphrates water mixed with liquid fertilizer coming from the bio-digester in a ratio of 1: 1(F). The results showed that the quality of irrigation water did not significantly affect the values of total organic carbon, while the effect of organic fertilization was significant on the values of total organic carbon, as the two treatments An and A significantly outperformed treatment C, and the values reached 20.7, 18.8 and 11.8 gmKg-1 respectively, while there were no significant differences between the treatments An and A, the interaction between irrigation water quality and organic fertilization did not affect the total organic carbon values statistically. The quality of irrigation water did not significantly affect the values of organic matter in the soil, while organic fertilization had a significant effect on the values of organic matter in the soil, as the treatments An and A were significantly superior to the treatment of C, and the values reached 35.7, 32.3 and 20.3 gmKg-1 respectively, while there was no Significant differences between the two treatments An and A. The quality of irrigation water and organic fertilization and the interaction between them did not affect the values of lime and active lime in the soil.