Changes in number of seed and seed yield of barley, s genotypes under drought stress and normal irrigation condition

In order to evaluate the seed yield and yield components of Barley ,s genotypes, under drought stress condition, an experiment was conducted at Kabotarabad Agriculture Research Station in 2011. These two experiments were done separately, by complete block design with 3 replications, 10 genotypes were studied at drought stress condition (Irrigation disruption after emergence of spikes) and normal water irrigation. In stress condition experiment, two last irrigations were omitted. The effect of treatment was significant on a thousand seed weight, biological yield and harvest index in non drought stress. Treatment also had significant effect on the number of seed per spike and a thousand seed weight in stress condition. Even though the maximum number of seed per spike and a thousand seed weight in normal condition was related to genotype number 6 and 10, respectively, the maximum seed yield and biological yield was achieved in genotype number 8 in non stress condition. Furthermore, the highest harvest index also obtained in genotype number 1. In drought stress condition the highest a thousand seed weight, seed yield and biological yield was related to genotype number 10, genotype number 2 and genotype number 4, respectively; moreover, genotype number 5 had obtained the highest harvest index. So cultivation of line 3 was appropriate in normal water condition. Also, Line 2 and 10 was suitable for producing high seed yield in drought stress condition.