Effect of plant density on yield and yield components of wheat cultivars

In order to study yield and yield components of wheat genotyps (Bahar، Pishtaz،Chamran under the five plant densities (225،300،375،450،and 500 plants per square meter) a split plot design as base of complete randomize block design with four replications was conducted at agriculture، Islamic Azad University of Khorramabad 2006-2007. The results showed that thousand kernel weight seed yield of Chamran was superior for leaf area index، plant height and biological yield. Pishtaz produced the highest seed per spike. Plant densities had significant effect on decreases of plant height and increases of leaf area index، number of spike per unit، seed yield، biological yield and harvest index. Seed yield had positive regression with number of spike m2، thousand kernel weight and negative regression with plant height. Results showed that Bahar with optimum plant density (450 plants per square meter)، produced the highest seed yield than other genotypes.