Majd Darwish*⁽¹⁾ , Nizar Moualla⁽¹⁾, and Hasan Ebd Al-Gani Hasan ⁽¹⁾

(1). Department of Field Crops, Faculty of Agriculture, Tishreen University, Lattakia, Syria.

(*Corresponding author: Dr. Majd Darwish. E-Mail: majds26@yahoo.com).

Received: 10/01/2023         Accepted: 10/04/2023

Abstract: 

An experiment was carried out in the Qardaha region lands-Lattakia governorate, which is located 450 m above sea level during the 2022 agricultural season by cultivation of tobacco (Nicotiana tabacum L.) seedlings in experimental plots using randomized complete block design (RCBD) with three replications. The research included the use of different concentrations of humic acid HA (0, 1, 2, and 3 g/L) and hydrogen peroxide (0, 9, 18, and 27 mmol) in order to study the effect of foliar spray treatments with humic acid, or hydrogen peroxide (HP), or spraying with humic acid and hydrogen peroxide together on some productivity and quality characters of local variety tobacco (Nicotiana tabacum L.). Plant height (cm), total leaf area (cm²), leaf area index (LAI)), productivity (fresh and dry leaves yield (kg/1000 m²), the total content of chlorophyll (µg/g FW), soluble sugars and nicotine % were measured. The results of the experiment showed that spraying treatments with humic acid (1 and 2 g/L), and with hydrogen peroxide (9 and 18 mM) led to a significant increase in probability (P<0.05) in most growth indicators, leaf yield, and quality, as the soluble sugars (%), increased and the nicotine (%) decreased in dry leaves. The spraying treatments of humic acid and peroxide together increased the values of growth, productivity, and quality parameters, when spraying with humic acid (1, 2, and 3 g/L) with hydrogen peroxide (9 and 18 mM). Thus, it can be concluded that spraying tobacco with humic acid at 1-3 g/L alone, or together with hydrogen peroxide at concentrations of 9-18 mM, or spraying with hydrogen peroxide at concentrations of 9-18 mM alone due to the increase in the dry leaf yield by about 20-57 % as compared to the control.

Keywords: Nicotiana tabacum L.; humic acid; hydrogen peroxide; Productivity.

Full paper in Arabic: pdf