Abstract :
In order the effect of plant density on yield, yield components and protein content of three durum wheat cultivars an experimental was conducted base on split plot in randomized complete block design whit three replications in Agriculture Research Center of Mehran station, Ilam, Iran in 2009-2010 growing season. Cultivars (Yavaros, Karkheh and Seymareh) were assigned main plot and plant density (300, 350, 400 and 450 plant.m-2) were assigned sub plot. The results showed that among cultivar were affect on all traits expect 1000-grain weight. Yavaros cultivar had the highest grain yield (4387 kg.ha-1), number of spike per m-2 (357 spikes) and number of grain per spike (35 g) other then cultivars. Plant density was affected on all traits. 400 plant.m-2 had the highest grain yield (4222 kg.ha-1), number of spike per m-2 (348.2 spikes), number of grain per spike (34.4 g) and harvest index (48.6%) other then plant density. Interaction effect cultivar × plant density was affect on grain yield. The highest grain yield was obtained (4853 kg.ha-1) from Yavaros cultivar × 400 plant.m-2 and the lowest grain yield (3112 kg.ha-1) obtained from Seymareh cultivar× 300 plant.m-2.
