The Response of Palm Trees of the Barhi Variety to Fertilization with Humic Acid and Biofertilizers in Some Qualitative and Productive Qualities

Abstract The study was at a Orchard Development Project in Um Ghragher area / Al-Husseiniya District / Karbala Governorate Throughout the 2024 cultivation season to investigate the impact of humic acid and biofertilizers on the qualitative traits and productivity parameters of Barhi date palms. The experiment was conducted as a factorial arrangement in(RCBD), comprising two factors: the first factor the was application of humic acid at four different concentrations (0, 5, 10, and 15 g.20 L. per palm-1), Whereas the second factor was involved the application of biofertilizer at four concentrations:(no addition, Azotobacter chroococcum at 150 mL.20 L. per palm −1 , Bacillus megatherium at 150 mL.20 L. per palm −1 , and a mixture of ( Azotobacter chroococcum 75 mL + Bacillus megatherium 75 mL).20 L.per palm-1 Results showed ground addition treatment with humic acid applied at a concentration of (15 g 20 L. per palm-1), resulted in significantly higer values compared to other treatments, recording the highest averages for all studied traits:(fruit weight, fruit volume, total sugars, fruit set percentage, bunch weight, and total yield). By comparison, the control treatment recorded the least values. Similarly, the B3 treatment (combined biofertilizers) significantly all other biofertilizer treatments, recording the highest averages in the same parameters compared to the control. Moreover, the combined interaction treatment Adding humic acid 15 g 20 L. per palm −1 and bio-fertilizer ( Azotobacter chroococcum concentration of 75 ml + Bacillus megatherium concentration of 75 ml) 20 L. per palm-1significantly all other combinations record in with the highest averages for all studied traits, whereas the control combination had the least.