Raouf Seyed Sharifi1, Hasan Bigonah Hamlabad 2, Jafar Azimi2
In order to evaluation of effects of different plant population levels on yield and growth indices of wheat (Triticum aestivum L.) cultivars, a factorial experiment based on randomized complete block design was conducted in Research Farm Islamic Azad University, Ardabil branch in 2006. Factors were: plant population levels at three levels (400, 450 and 500 seedsm-2) and wheat cultivars at four levels (Azar, Sardari, Frankia and Trakia). The results showed that various levels of plant population affected yield and growth indices of wheat (Triticum aestivum L.). Mean comparison in compound of treatment cultivar× levels of plant population showed that maximum grain yield was obtained by the plots which was applied 500 seed m-2 with Azar cultivar. Investigation of variances trend of total dry matter indicated that in all of treatment compounds, it increased slowly until 172 days after sowing with increasing of plant population and then increased rapidly till 284 days after sowing. From 284 days after sowing till harvest time, it decreased due to increasing aging of leaves and decreasing of leaf area index. Increase in plant population levels also significantly increased the crop growth rate and the maximum of it was observed by the plots that was applied 500 seed m-2 with Azar cultivar. In addition, in all of treatment compounds, CGR increased slowly until 228 days after sowing and then decreased till 298 days after sowing due to increasing aging of leaves and decreasing of leaf area index. Thus, it can be suggested that in order to increasing of grain yield, total dry matter, crop growth rate and the other of physiological indices should be applied Azar cultivar with 500 seed m-2 in conditions of Ardabil Plain
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