Effect of Brassinolide and Salt Stress on some Vegetative Growth Characteristics and Yield of Active Substance of Marjoram.

The study was conducted in Department of Horticulture and Landscape, College of Agriculture - Kirkuk University during the spring season of 2022 to study the influence of foliar spray with Brassinolide and salt stress on some vegetative growth characters and yield of active substance of marjoram., the experiment which included two factors, the first is Brassinolide growth regulator at four concentration (0.1, 0.2, 0.3) g.L -1 while the second is adding NaCl (0,10, 5, 15) gm. L-1 . The experiment was designed according to the randomized complete block design (R.C.B.D), with three replications and three plants for experimental unite. The results showed that the superior Brassinolide with a concentration of 0.3 mg. L-1 in number of branches, total chlorophyll, fresh weight, and dry matter (15.96) 18.28 mg. 1gm-1, (71.19%) respectively, while NaCl did not show any significance for all traits compared to control treatment. As for the interaction, the treatment (0.3gm.l-1 Brassinolide + 0gm.l- 1 Nacl) gave a high significant in the number of branches, dry matter 15.96 and 71.19, respectively, while the treatment (0.2 g.l-1 Brassinolide + 5 g.l-1 ) excelled in total chlorophyll fresh weight. [ABSTRACT FROM AUTHOR]