Impact of Water Stress and Marine Algae Spraying on Vegetative and Biochemical Traits of Hibiscus tiliaceus

The experiment was conducted in the lath house covered by saran belonging to the preparatory school of agriculture in Abu Gharaq for the spring season 2022/2023. The Hibiscus tiliaceus plant is considered the latest type of tree to have spread recently in Iraq, due to its ability to withstand harsh environmental conditions and the beauty of its large yellow flowers. Water scarcity in Iraq is considered one of the biggest pressures and problems facing plant growth, especially in the early stages of agriculture. Therefore, the current study was conducted on the effect of water stress and spraying with marine algae on the vegetative traits and active compounds of the Hibiscus tiliaceus plant, where three traits were studied. The first trait is the area of the plant's leaves. The highest rate of increase was obtained in leaves of (159.107 cm 2 ), with exposed to spraying with seaweed at a rate of 4 ml/L, the second characteristic is the increase in the diameter of the branches, where the highest rate of increase reached (16.232 mm) when water stress was applied for 10 days. The third characteristic was the percentage of chlorophyll in the plant, where the highest rate of chlorophyll reached (36.883 CCI) when a water stress of (10 days) was applied.