Effact of different sowing dates on yield components of wheat (triticum aestivum L.) cultivars in Lorestan provience, Iran

A study was undertaken to determine the effects of sowing dates on growth and yield components of different wheat cultivar in Iran. The trial was laid out in RCBD with split plot arrangement having three replications during 2011-12 and at Boroujerd, Iran. Five sowing dates i.e. October 31, November 15 and 30, December 15 and 30 were in main plots, whereas five wheat cultivars (Pishgam, Parsi, Bahar, Sivand and Pishtaz) were in sub plots. Results shows that the effect of sowing date was significant on all parameters excluding HI. the effect of cultivars was significant on all parameters excluding 1000 grain weight. Maximum number of grain per spike related to Pishtaz cultivar. However, Maximum HI related to Pishgam and Bahar cultivars. Parsi cultivar has the highest seed yield (10.23 ton/ha) and the Pishtaz cultivar has the lowest seed yield (8.59 ton/ha). The highest seed yield for sowing date (10.15 ton/ha) gave at Nevember15 sowing date the lowest seed yield (6.1 ton/ha) gave at December30 sowing date The Parsi cultivar gave highest yield for sowing dates but Pishgam cultivar was better for sowing in Nevember15 and Bahar cultivar was better for sowing in December15.