Effect of humic and fulvic acid treatment on the anatomical traits of the leaves of two genera of seedlings of ornamental palm Washingtonia filifera and Phoenix canariensis

Abstract

This study was conducted in the growing season of 2021 at the Agricultural Research Facility Station, University of Basrah. Start with seedlings of two genera of ornamental palm trees: Washingtonia filifera and Phoenix canariensis. Were given dosages of humic acid as treatment (0, 10, and 15 ml.L-1). And fulvic acid by ground addition at concentrations of (0, 5, and 10 g.L-1). The findings revealed that humic acids significantly impacted the anatomical traits and caused the improvement of those traits. The Humic acid content of (15 ml.L-1) caused an increase in the thickness of epidermal cells, the length of columnar cells, the diameter of large and small vascular bundles, and the diameter of the fibrous bundles. Additionally, a level of fulvic acid (10 g.L-1)caused a similar increase in those anatomical traits. The triple interaction significantly impacted the qualities under study. The interaction between the Washington type, the (15 ml.L-1) of humic acid, and the (10 g.L-1) of fulvic acid provided the highest values. ​​For the anatomical traits, the thickness of epidermal cells, length of Columnar epithelial cells, the diameter of large and small vascular bundles, and diameter of large and small vascular bundles. And the diameter of the fibrous bundles. Washingtonia palm was significantly higher than the canary palm and had the highest values ​​for epidermal cell thickness, columnar cell length, large and small vascular bundle diameter, and fibrous bundle diameter. Keywords: ornamental trees; humic substances;leaves; anatomical; fulvic acid; seedling