Majd Darwish*⁽¹⁾ Rabie Zaine⁽²⁾ Nizar Moualla⁽¹⁾ and Haneen Mohamad⁽¹⁾

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

(2). Agricultural Scientific Research Center, Lattakia, Syria.

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

Received:28/06/2023          Accepted:20/08/2023

Abstract: 

The experiment was carried out at the Scientific Agricultural Research Station (Setkhiris-Lattakia), during the period from mid-May to June of the year 2022, by applying foliar spraying with potassium humate (k-humate) at concentrations of (0- 0.5- 1- 1.5) g/L and in two stages after forty and sixty days of transplantation of three tobacco varieties (Virginia VK51- Burly R21- Katrina), according to a randomized complete block design (RCBD) with three replications for each treatment. The aim of the research was to study the behavior of the varieties used under the influence of foliar spraying with potassium humate and to determine the concentrations that have a significant effect on the growth and development of the plant. So, some of morphysiological characteristics as plant height (cm), leaf area (cm²/plant) and photosynthesis efficiency (g/cm²/day), and the content of chlorophyll and carotenoids (µg/g/wet weight) were recorded. The results showed a stimulating effect of foliar spraying applied at a concentration of 0.5 g/L humate potassium on most of the studied traits (leaf surface area (cm²/plant), photosynthesis efficiency (g/cm²/day), chlorophyll and carotenoids content (µg/g/wet weight)) of the three varieties, while the spraying concentration of 1.5 g/L had a significant stimulating effect on plant height (cm) in the three varieties. The research concluded that there was a variation in the response of the studied varieties to the spraying concentrations used. Compared to the control, Virginia VK51 variety showed the best response to foliar spraying with 0.5 g/L potassium humate in both characteristics of plant height and photosynthesis efficiency, with an increase of 18-55 %, respectively, and in Katrina variety at the same concentration, the increase in the content of chlorophyll and carotenoids was 44-48 %, respectively, while the Burly R21 showed the best response to the foliar application of 1.5 g/L potassium humate in leaf surface area with an increase of 20 %.

Keywords: Tobacco; Morpho-physiological behavior; Potassium humate.

Full paper in Arabic: pdf