Effect of Alar and Light Intensity on the Leaves Content of some Nutrients and Chemical Compounds of Juniper Plant (Juniperus Sabina L.)

Abstract

The experiment was conducted at the Agricultural Research and Experiment Station of the Department of Horticulture and Landscaping, College of Agriculture - University of Kirkuk in Al-Sayada, located at latitude 35.23 North and longitude 44.20 East and at an altitude of 300 meters above sea level for a full year from 1/6/2021 to 1/6 /2022 on the seedlings of the juniper plant (Juniperus Sabina L.) at one year of age to know the effect of foliar spraying with Alar, three concentrations (0, 750 and 1500 mg.L−1) and two levels of light intensity (50% indoors woody canopy and 100% direct sunlight). on the content of leaves of nutrients and chemical compounds. Using the randomized complete block design (RCBD) system, with three replications, three seedlings in one experimental unit, spraying with the Alar growth retardant at a concentration of (1500) mg.l−1 resulted in a significant increase in the percentage of the leaf content of nitrogen, phosphorus, potassium, carbohydrates and protein, as it gave an average of (2.573%, 0.465%, 2.995%, 14.928%, 16.079%), respectively. Also, when exposing the cultivated plants in the city of Kirkuk to a light intensity of 50%, it led to a significant increase in all the studied traits of nitrogen, phosphorus, potassium, carbohydrates and protein in the leaves gave an average of (2.877%, 0.477%, 3.460%, 15.218%, and 3.460%), respectively. As for the bilateral interfere between the Alar at a concentration of (1500) mg.L-1 and the intensity of light at the level of 50%, it gave the highest percentage of the content of the leaves of nitrogen, phosphorus, potassium, carbohydrates and protein at rates of (3.465%, 0.690%, 3.950%, 16.215%)., 21.657%), respectively, with a significant difference with the rest of the other interventions.