در منطقه تهران )HORDEUM VULGARE L.( تاثير تراكم بوته و مقدار كود نيتروژن بر عملكرد و اجزاي عملكرد ژنوتيپ هاي جو لخت

Effect of plant density and nitrogen rate on yield and yield components of hulless barley( Hordeum vulgare L.) genotypes in Tehran Region

In order to study the effect of plant density and nitrogen rate on yield and yield components of 10 hulless barley genotypes, an experiment was conducted in research farm of Tarbiat Modarres University, College of Agriculture, (Tehran, Iran) during 2001-2002. This experiment was based on split-split plot design arranging in a randomized complete block with three replications. The main plots included ten genotypes of hulless barley, the subplots included two levels of nitrogen fertilizer (90 and 120 kg nitrogen/ha) and the sub-subplots included three-plant densities (300, 400 and 500 plants/m2). The results showed that there were significant differences between genotypes and plant density interaction for grain yield and harvest index. The highest grain yield, spike number/m^2 and seed number/spike were produced by barley genotype ALLSOʹSʹ/CIO 3902-2 (500 plant/m^2). Genotype F1CC2595 showed the highest 1000 grain weight (45 gr) and genotype FICC 1570 produced the highest spike number/m^2 (625 spike/m^2). The mean comparison of protein yield in different plant densities showed that the 500-plants/m^2 treatments produced the highest protein yield (with 58.48 gr/m^2).