Effect of hornwort extract and spraying with thiamine and phenyl-alanine on some vegetative growth indicators of Damask rose (Rosa domascena Mill.)

Abstract

The experiment was conducted in the plant canopy of the Department of Horticulture and Landscape Engineering at the College of Agriculture - University of Kerbala for the period from 1/3/2024 to 1/7/2024 to study the effect of adding hornwort extract and spraying with thiamine and phenylalanine on the vegetative traits of Damask rose seedlings (Sultani variety). The experiment was conducted using a randomized complete block design (R.C.B.D) according to the factorial experiment arrangement with three replications. The factors included hornwort extract at two concentrations (0 and 8 g L^-1). Thiamine spray at three concentrations (0, 75 and 150 mg L^-1). Phenylalanine spray at three concentrations (0, 75 and 150 mg L^-1). The results showed that the treatment of the extract of the hornwort at a concentration of (8 g L^-1) was outperforming in the average increase of seedling height (36.859 cm), seedling diameter (4.690 mm), number of leaves (38.830 leaf seedling^-1) and leaf area (29.879 cm²). The results showed significant differences between the thiamine spray concentrations, as the concentration of (150 mg L^-1) outperforming the aforementioned traits, as it recorded averages of (42.722 cm, 5.436 mm, 50.167 leaf seedling^-1, 35.571 cm²) respectively. The results also showed significant differences between the phenylalanine spray concentrations, as the concentration of (150 mg L^-1) outperforming the same traits, with averages of (37.922 cm, 4.584 mm, 40.522 leaf seedling^-1, 30.262 cm²) respectively. The triple intervention achieved the best results, indicating the efficiency of the combined use of the three factors.