Evaluation of Yield and Yield Components of Forage Sorghum Using Zinc Sulfate and Nitrogen Fertilizer

In order to study of the effects of nitrogen and zinc sulfate fertilizer on yield and yield components of  forage sorghum (var. Pegah), a factorial experiment was conducted based on randomized complete block design with three replications on farm of agricultural jihad Qasr Shirin, Kermanshah Province. The treatments were included four levels of nitrogen fertilizer (0, 125, 250 and 375 kg.ha-1) by urea and three levels of zinc sulfate (0, 40 and 80 kg.ha-1). The results showed that the effect of nitrogen fertilizer and zinc sulfate was significant on the content of photosynthetic pigments, Cu concentration, plant height and dry forage yield. The effect of nitrogen fertilizer was significant on the concentration of Fe and Mg, nitrogen content of plant, the number of tiller and fresh forage yield. According to the results this study, it be suggested that  nitrogen and zinc sulfate fertilizer be appliedas 375 and 80 kg.ha-1, respectively.