Abdullah Rajab Ahmed ⁽¹⁾, Majd Mohammad Darwish*⁽¹⁾ and Nazeeh Rokiah⁽¹⁾

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

(* Corresponding author: Dr. Majd Darwish, Lattakia, Syria. E-mail: majds26@yahoo.com).

Received: 20/08/2019                               Accepted:19 /12/2019

Abstract

The experiment was carried out at Alrensiya village in Tatous governorate in the Syrian coast during the agricultural season 2018, and based on a randomized complete block design with three replicates. The aim of this study was to determine the response of Burley₂₁ tobacco to water stress and nitrogen fertilizer additives. Both growing plants under full irrigation and water stress (50% of field capacity) were subjected to four nitrogen fertilizer additives (25, 50, 75 and 100) kg/ha. So, the plant height, plant leaf area, leaf area index (LAI), photosynthesis rate and crop growth rate, chlorophyll and carotenoids contents, fresh and dry leaves yield and leaf thickness were studied. The nitrogen fertilization increased most of the studied traits and indicators, both under irrigation conditions with full water requirements and under water stress conditions. This positive effect was also proportional to the amount of fertilizers used. However, water stress, led to decreases in most of the studied traits as compared to nitrogen fertilization treatments under the full irrigation conditions. In addition, the nitrogen treatment improved the growth and productivity indicators under water stress, and this positive effect was also proportional to the amount of fertilizers. The best results were obtained at nitrogen fertilization of 100 kg/h, either under irrigation conditions with full water requirements or under water stress compared to other fertilization treatments

Keywords:Burley₂₁, Nitrogen fertilization, Water stress, Leaves yield.

Full paper in Arabic: PDF