Response of two Varieties from Hyacinthus orientalis L. to foliar spraying with different organic fertilizer concentrations (Optimus-plus) and salicylic acid

This study was conducted from November 1st to June 1st, 2023, inside the wooden canopy of the Horticulture and Landscape Architecture Department, College of Agriculture and Forestry, University of Mosul. The objective of the study was to assess how two varieties of Hyacinthus orientalis L., called "Carnegie" with white flowers and "Woodstock" with purple flowers, responded to three treatments of Optimus-plus fertilizer (0, 1.5, 3) ml L-1, as well as three treatments of salicylic acid (0, 150, 300) mg. L-1, applied to the vegetative system three times. A randomized complete block design (RCBD) with three replicates and eight plants per treatment was employed in the factorial experiment's implementation within the split plot. The results indicated the following: *The white variety (Carnegie) recorded the greatest rates in all of the studied characteristics; plant height, number of leaves, dry weight of leaves, and leaf area. * Spraying the plants with the organic fertilizer Optimum Plus at a concentration of 3 ml L-1 had a significant influence on obtaining the highest values in all of the studies assessed. * Salicylic acid spraying at a dosage of 300 mg L-1 had the highest significant values in all of the  characteristics that were assessed. * The results of the triple interactions between the study factors indicated that the highest significant values for plant height, number of leaves, and leaf area were obtained when the plants (Carnegie white) were sprayed with Optimum-Plus, an organic fertilizer, at a concentration of 3 ml L-1, in addition to 300 mg L-1 of salicylic acid. * Data on the triple interactions between the study factors revealed that spraying purple (woodstock) plants with Optimum-Plus fertilizer at a concentration of 2 ml L-1 combined with spraying with salicylic acid at a concentration of 300 mg L-1 recorded the highest significant values for leaf length, leaves number, leaf area, and leaf dry weight. in split plot)