Effect of foliar spraying with Roselle extract and proline acid on the growth and yield of okra Abelmoschus esculenus L. grown under salt stress conditions

The study was conducted at the Agricultural Research Station of the College of Agriculture, University of Basrah, in the Karmat Ali area during the spring of 2023. To study the effect of foliar spraying with Roselle extract (0, 10, 20) g L-1 and with different concentrations of proline acid (0,100,200) mg L-1 and the interaction between them on the growth and specific yield of okra plants, Al-Khanisriya variety. The results showed that spraying with 10 gm L-1 of Roselle extract caused a significant increase in plant height, number of branches, number of leaves, leaf area and fresh and dry weights of the plant. Spraying with 100 mg L-1 of proline acid caused a significant increase in weight, number of branches, number of leaves, leaf area, fresh and dry weights of the plant, carotene content of the leaves, and fruit length. The interaction between the two factors showed a significant effect on most of the studied traits, as plants sprayed with 10 gm L-1 of Roselle extract and 100 mg L-1 of proline acid gave the highest values ​​of plant height, number of branches, number of leaves, leaf area and fresh and dry weights of the plant, which reached (48.0 cm, 9.0 branches, 51.0 leaves, 76.9 dm2, 233.0 gm,45.70 g) respectively.