Abstract

The study was conducted in the fields of the Department of Horticulture and Landscape
Engineering / College of Agriculture / Kirkuk University / Shwaro District , It is located on the
latitude (35.53°) and longitude (44.38°) of the city of Kirkuk , for a period of ten months from
June 2021 to April 2022 . for one-year old myrtle seedlings, and the seedlings were homogeneous
in size and height (42 ± 2 cm) ,the study included the effect of three factors on the myrtle plant ,
the first factor the percentage of shading (50% inside wooden awning and shading with green saran
clip 75%) , and the second factor has three levels of the growth regulator benzyl adenine at
concentrations (0, 35, 70) mg.L-1 , by two sprays The first is in October and the second is in
November , and the third factor is three levels of ( Horti boost10) organic fertilizer at
concentrations (0, 1, 2) ml.l-1, the implementation of this study followed the design of randomized
complete blocks (RCBD) with a factorial experiment , and by three replications, the number of
seedlings was (2 x 3 x 3 x 3 x 2 = 108) seedlings , the results were analyzed using the SAS program
and the averages were compared using Duncan's polynomial test at the 5% probability level , the
results showed that the percentage of shading at the intensity was 50% , as it led to a significant
increase in the diameter of the plant stem by 0.51 mm , And at the intensity 75% significant
increase in plant height 62.62 cm, number of branches 28.32 branches.Plant-1 and The length of
the branches is 18.56 cm, and spraying with benzyl adenine at the concentration of 70 mg.L-1 was
significantly superior in most of the studied growth traits, it gave the highest rate in highest rate
in plant height , plant stem diameter, and branches length which amounted to (67.71 cm , 0.65 mm,
21.23 cm) , respectively . When spraying with organic fertilizer, it led to a significant increase in
most of the studied growth characteristics, where the spraying at a concentration of 2 ml.l-1 was
significantly superior in the characteristics of plant height 63.36 cm, stem diameter 0.543 mm,
length of branches 19.58 cm, respectively