Investigation of changes harvest index, yield and grain yield components in modern and old barley genotype. (Hordeum vulgare L)

In order to evaluation of grain yield and its relation with grain yield components, changing harvest index and biological yield in barley, an experiment was conducted during 2005-2006 growing season in field experimental of Gorgan Agricultural Science and Nature Resource in randomized complete block design with 4 replication by 10 barley genotypes treatment. The genotypes were: Bomi, Torkaman, Eize, Siah, Sahra, 1-yeknavakht, 14G, 11G, 5G and 15G, that recommended by Golestan Agricultural Center. Results showed the higher grain yield is related to 14G that is from modern genotype of this region. The lower grain yield is related to Torkaman that is one of the oldest genotype. These genotypes showed significant difference in considerate of biological yield and harvest index. Correlation between biological yield with yield and yield components was positive. The highest harvest index (HI) is related to modern and modified genotypes that they category in high yield genotype group. Positive correlation between grain yield and harvest index and its improvement in modern genotype could be one reason for increasing high yield.