Evaluation of seeding rate on forage and grain yield of wheat (Triticum aestivum L.) in dual purpose cultivation in Khorramabad

To evaluate the seeding rate effect on forage and grain yield of wheat (Triticum aestivum L.) in irrigation cultivation, an experiment was conducted as split-split plots based on randomized complete block design with three replications at Khorramabad conditions in 2011. Treatments included two cultivars of wheat (Pishtaz and Chamran), with and without green forage harvesting as sub- plots and three levels of seeds (150, 200 and 250 kg/ha) as sub-sub- plots. The plants were harvested at vegetative growth stage (tillering stage) for green forage and the physiological maturity for grain production. The measured factors were forage yield and grain yield, grain weight, biological yield, harvest index, grain number per m2, the spike number of grain per m2 and one thousand grain weights.Results showed that among cultivars, forage harvesting and seed amount were significant. The maximum grain yield, dry forage yield and thousand grain weights belonged to Pishtaz cultivar. The highest grain and biological yield, harvest Index and thousand grain weight, were obtained in nonharvesting treatment. Also, the most grain yield, dry forage yield and biological yield were depended to 250 kg/ha. Therefore, in order to produce wheat in dual purpose cultivation at khorramabad and similar climatic conditions, Pishtaz cultivar and 250 kg/ha seed rate were found to be better compared to Chamran and other seeding rates.