The prevailing study aimed to determine the effects of organic fertilizer Libro with four concentrations (0, 1, 2, and 3 ml L^-1) and the growth retardant Cultar with three concentrations (0, 0.03, and 0.05 mg L^-1) on Bermuda grass (Cynodon dactylon L.) in a randomized complete block design (RCBD), carried out in 2022 at the University of Anbar, Iraq. The results revealed that the treatment of plants with organic fertilizer Libro at a concentration of 3 ml L^-1 led to a significant increase in most of the vegetative growth characteristics represented by the plant density rate, nitrogen, phosphorus, color degree, and the degree of trampling tolerance 2.500, respectively. The treatment with a growth retardant represented by Cultar reduced cutting times to 2.000.

Keywords: Bermuda grass (Cynodon dactylon L.), organic fertilizer, Cultar, Libro, biochemical traits

Key findings: The results showed that organic fertilizer Libro at a concentration of 3 ml L^-1 led to a significant increase in most vegetative growth characteristics, viz., plant density rate, nitrogen, phosphorus, color degree, and the trampling tolerance degree of Bermuda grass. The growth retardant Cultar reduced the number of cutting times.