Noufal  El-Radwan⁽¹⁾, Ghassan Telly⁽²⁾ and Bayan Muzher ⁽³⁾

(1). Postgraduate/PhD student- the General Commission for Scientific Agricultural Research (GCSAR).

(2) Research- Professor, Horticulture Department, Faculty of Agriculture engineering, Al-Baath University.

(3) Researcher at the Pome and Grapevine Division Sweida, GCSAR.

(Corresponding Author: Noufal  EL-Radwan, Email: noufalrrr111@gmail.com )

Received:   22/2/2024         Accepted:  25/5/2024

Abstract: 

The research was carried out at Al-Mukhtariyya Research Station in Homs governate, during the years 2020, 2021 and 2022 on the grape bushes, Var. local Helwani, to study the effect of two concentrations of each of plant extracts (garlic and onion 5-10 ml/l, licorice 2-4 g/l), and organic extracts (seaweed and bake yeast 2.5-5 g/l) in some productivity indicators and grape fruits quality. Spray treatments were applied at three dates, two weeks before flowering, one week after setting, and four weeks after the second date. The experiment was designed according to a randomized complete block design with three replicates. The grapevines were mixedly pruned in mid-February, with a total wintering load of 160 eyes/grapevine. The results showed a significant superiority for yeast suspension and seaweed extract Alga 600 at both concentrations, as the amount of productivity per grapevine reached (69.73 and 74.6 kg), fruits content of total soluble solids TSS% ranged between (17.38 and 17.98 %), and the total sugars (16.19 and 16.74 %), followed by the licorice extract 2 g/l (58.83 kg/grapevin) by significant differences compared to rest of the treatments. The lowest productivity of the grapevine was in the treatments of garlic extracts at both concentrations and onion extract 10 ml/l, it ranged between (33.60 and 38.51 kg). This productivity was lower than the control treatment (42.06 kg), which achieved the hiegest significant value for the titratable acids in fruits (0.391%). Therefore, it is recommended to spray a suspension of bake yeast (2.5 g/l) on the three dates. To obtain a production estimated at approximately (42.28 kg/grapevin), as an alternative to seaweed products available in the markets due to their low costs, ease of preparation, and the absence of significant differences in production.

Keywords: Helwani grape variety, (plant, organic) extracts, production, quality of fruits.

 Full paper in Arabic: PDF