مطالعه تجزيه رشد و عملكرد دانه ژنوتيپ هاي جو

To study some physiological characteristics affecting grain yield in 7 barley genotypes, a field experiment was conducted at Kaboutarabad Research Station,Esfahan,during 1998-2000 cropping seasons using a randomized complete block design with three replications.The results revealed that genotypes were significantly different in grain yield. Genotypes (Torsh / 9cr.279 – 07 / / Bgs S )no.6 (7300 Kg / ha) and (Chat / / Roho / Alger – Ceres ) no.7 (5400 Kg / ha) produced highest and lowest grain yield, respectively. Genotypes no.6 (6.2) also developed the highest canopy. However , the smallest canopy belonged to genotype no.7. Dry matter accumulated with slow rate until 750?cd , however , it increased ,There after and reached to its maximum at 1700 ?cd. Total dry matter declined later. Walfajer(no.1) was the latest(1400 ?cd) to reach to spike emergence and the 6 remaining genotypes were similar (1100?cd). Genotype, no.1 with the highest CGR (23.4 gm-²(10?cd)-1)) at anthesis was the most efficient genotypes in dry matter production.This explain its high grain yield.