Nsreen Dahe Mohamad*(1)
(1). Department of Horticulture, Faculty of Agricultural Engineering, Tishreen University, Lattakia, Syria.
(*Corresponding author: Nsreen Dahe Mohamad, E-mail: nsreenmohamad1986@gmail.com, mob.: 0988487892)
Received: 23/3/2024 Accepted: 13/7/2024
Abstract
The research was carried out in the Al-Haffa area, the village of Bamrin, in the country side of lattakia, during the 2022 growing season on Washington navelate orange trees were grafted on Citrus aurantium L. rootstock, in order to study the effect of foliar and ground fertilization with humic acid on some leaf’s characteristics and fruit qualitative. The experiment was designed according to completely randomized design. The experiment included seven treatments and three replicates. Foliar and ground fertilization with humic acid was used at concentrations of 0.25,0.5,1 g/l for the foliar and 3,4,5 g/l for the ground at the following dates : the stage of flower bud swelling in the middle March , the stage of fruit set in May , After month from the second spraying in June . The two concentrations 1 foliar and 5 ground fertilization were distinguished by the other two concentrations by giving the highest leaf area (43.95, 43.607) cm2, respectively, compared to the control 30.837 cm2 . Fertilization with humic acid also led to improvement the physical and chemical characteristics of the fruits. As the two concentrations of 1 g/l for the foliar and 5 g/l for the ground fertilization gave the highest values in terms of the weight and volume of the fruit and the of percentage the juice, superior to rest of the treatments, but without significant differences between these two concentrations. the content of the fruits of total soluble solids, total sugars and vitamin c also increased when treated with humic acid compared to the control , while the acidity content of juice fruit was reduced when treated with humic acid, and the control treatment gave the highest acidity percentage 1.720 % As for the total chlorophyll content of the leaves , the two concentrations of 1 g/l for the foliar and 5 g/l for the ground were superior to the rest of the treatments (11.74,11.61)mg/g respectively, but without any significant differences between these two ,while the control gave the lowest value for total chlorophyll is 9.69 mg/g.
Key words: humic acid, weight and volume of the fruit,”Washington navelate”, chlorophyll leaf, leaf area.
Full paper in Arabic: PDF