Ahmad Shams Aldien Shaaban⁽¹⁾ Abdullah Al-Youssef*⁽²⁾ Naim Al-Hussein⁽²⁾

Yaman Jabbour⁽²⁾ Saleh Saleh⁽²⁾ and Hiba Al-Atrash⁽²⁾

(1). Dept. of Field Crops, Faculty of Agriculture, Aleppo University, Aleppo, Syria.

(2). Aleppo Research Center, General Commission for Scientific Agriculture Research (GCSAR), Damascus, Syria.

(*Corresponding author: Dr. Addullah Al-Youssef.  Email: dr.abdalyoussef@gmail.com).

Received: 03/11/2016                                 Accepted: 21/12/2016

Abstract

Gradual drought experiment was carried out under greenhouse conditions at a Field of Crop Department, Faculty of Agriculture, Aleppo University, Syria, during 2016 season to compare transpiration rate of eight barley genotypes. Relations between Normalized Transpiration Ratio (NTR) and Fraction of Transpirable Soil Water (FTSW) were determined using linear plateau models. Results showed that, there were differences in the curve of relation between NTR and FTSW for the studied genotypes. The lowest threshold values were 0.43 for Furat 5 genotype, while the highest value was 0.64 for Araby Aswad genotype. Also, Araby Aswad genotype had the minimum decreasing in wet biomass after gradual drought imposing, where the decreasing in biomass was (19.3%), followed by Furat 3 (31.5%). Whereas, decreasing ratio in other genotypes exceeded 65%, and ranged between 66.5% for Furat 2 genotype to 80.3% for T6669 genotype.

Key words: Gradual dehydration, Transpiration ratio, Water stress threshold, Barley.

Full paper in Arabic: PDF