The latest study aimed to identify the effects of organic manure (sheep manure) with four concentrations (0, 5, 10, and 15 g seedling^-1) and nano-zinc four levels (0, 1, 2, and 3 g L^-1) on the growth of peach cultivar Hollywood seedlings. The experiment began in 2022 at private nurseries in Babylon province, Iraq. The nano-zinc application with three foliar sprays transpired at 30-day intervals. The experiment continued in a randomized complete block design (RCBD) with three replications. The addition of organic manure treatment (15 g seedling^-1) excelled in traits of seedling length, stem diameter, number of leaves, chlorophyll content, shoot dry weight, leaves area, and zinc in the leaves, with highest averages of 62.03 cm, 8.08 mm, 51.20 leaf seedling^-1, 43.8 SPAD, 57.35 g seedling^-1, 1322.3 cm², and 56.40 mg kg^-1, respectively, compared with the control treatment. The addition of nano-zinc (3 g L^-1) was significantly superior in performance and excelled other treatments by revealing the highest values for the above growth traits, i.e., 60.45 cm, 7.83 mm, 50.90 leaves seedling^-1, 42.35 SPAD, 54.85 g seedling^-1, 1251.90 cm², and 53.63 mg kg^-1, respectively.

Keywords: Peach (Prunus persica L.), organic matter, nano-zinc, foliar nutrition, growth traits, physiological parameters

Key findings: Organic manure (15 g seedling^-1) produced the highest averages of 62.03 cm, 8.08 mm, 51.20 leaf seedling^-1, 43.8 SPAD, 57.35 g seedling^-1, 1322.3 cm², and 56.40 mg kg^-1 for the seedling’s length, stem diameter, number of leaves, chlorophyll content, dry matter of the seedling shoot, leaf area, and zinc content in the leaves, compared with the control treatment.