Response of Three Bread Wheat Cultivars to Different Levels of Seeding Rates in Ilam Region

In order to study the effects of seeding rates on yield and yield components of three bread wheat cultivars¡ a factorial experiment based on randomized complete block design (RCBD) with 3 replications was conducted during 2006-2007¡ in Sarableh town¡ Ilam province¡ Iran. Three cultivars¡ were Chamran¡ Chanab¡ and Falat and four seeding rates were 200¡ 300¡ 400¡ and 500 seeds per m2. Results showed that¡ the differences among cultivars and seeding rates were significant for 1000 seeds weight¡ harvest index¡ and phenological traits¡ using 400 seeds per m2. Chamrans produced highest harvest index and Chanab at seeding rate of 200 seeds per m2 had the lowest harvest index. Falat produced the highest seed yield (5600 kg/ha) at 400 seeds per m2 and Chanab the lowest seed yield (3800 kg/ha) at 500 seeds per m2. The highest correlation coefficients were observed between seed yield¡ harvest index (r=0.84**)¡ seed numbers per spike (r=0.79**) and 1000 seeds weight (r=0.59*).