Effect of urea application and gibberellic acid foliar spraying on growth characters and some physiological parameters of almond seedlings

Abstract

The present study was conducted in private farm, Homs province, Syria, during the season 2021-2022 to study the effect of urea application (0, 50, 100 g/seedling), GA₃ foliar spray (0, 0.5, 1 g/l) and their combinations on some morphological and physiological characters of almond seedlings cv. Zaghhori. The chemical analysis was carried out in laboratory of plant physiology, Horticultural science Department, Faculty of Agriculture, Damascus University. The combination treatment of urea (100 g/tree) and GA₃ (1g/l) significantly promoted the growth characters (203.55 cm, 119.44 cm, 54.57 cm, 5.18, 22.19, 5.96 cm for seedlings height, trunk height, structural expelled height, structural expelled number, branches number average, trunk diameter respectively), and improved the physiological parameters (9.81cm², 0.72 gm, 0.19 gm, 87.22 %, 3.50 mg/g fresh weight, 0.94 mg/ g fresh weight, 0.80 mg/ g fresh weight 1.92 %, 0.51 %, 1.92 % for leaf area, leaf fresh and dry weight, relative water content in the leaves, chlorophyll a, chlorophyll b, carotenoids, N, P and K respectively) comparing with all studied treatments and with control which resulted in the lowest values for all studied parameters.