Abstract
The experiment was conducted in the lath house belonging to the Department of Horticulture and Landscape Gardening, College of Agriculture, Anbar University, from 1/3/2022 to 15/11/2022 to determine the effect of soil application of humic acid at three levels (0, 10, 15 g sapling−1), respectively, and foliar spray of urea fertilizer at three concentrations (0, 10, 15 g L−1), respectively, and their interaction on the vegetative growth characteristics and leaf mineral content of Khistawi olive saplings. The results showed a positive effect of adding humic acid on most of the vegetative and characteristics and mineral content of the leaves. Adding (15 g sapling−1) resulted in a significant superiority in stem diameter, leaf area, new shoot lengths, percentage of nitrogen, chlorophyll content, carbohydrates, and leaf dry matter, with 4.236 mm, 5.190 cm2, 7.684 cm, 1.824%, 76.739 mg 100 g−1, 7.094%, 47.878% respectively compared to the control treatment. Foliar spray of urea fertilizer at concentration (15 g L−1) resulted in a superiority of the mentioned characteristics above when adding humic acid, reaching 4.530mm, 5.607 cm2, 8.066 cm, 1.844%, 77.578 mg 100 g−1, 7.190%, 48.126% compared to the control treatment. The interaction between the studied factors showed a similar behavior to the individual factors for all studied characteristics.
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