تاﺛﻴﺮ ﻧﻴﺘﺮوژن ﺑﺮ ﻣﺤﺘﻮی ﻓﻨﻞ ﺳﻮرﮔﻮم ﻋﻠﻮﻓﻪای( Sorghum bicolor L ) در ﺷﺮاﻳﻂ ﺗﻨﺶ آﺑﻲ

Water stress and essential nutrients availability is two major factors that affect crop production. In order to evaluate the effect of type of the nitrogen fertilizers and water stress on total phenol of forage sorghum, an experiment was conducted as factorial in completely randomized design with 3 replications. Water stress treatments were included: full irrigation and water deprivation and fertilizer treatment were included: urea fertilizer, inoculation of sorghum seeds with Nitroxin and Nitro Kara biofertilizer. The Results of interaction between fertilizer and full irrigation showed that Nitrokara biofertilizer and control treatments had the highest and lowest amount of phenol respectively. Notably, the concentration of total phenolics increased 39.84% and 41.72% in (Nitrokara biofertilizer + full irrigation) and (urea fertilizer + cut irrigation) respectively relative to control condition. In addition, Total phenol significant decreased in leaves with increased water stress levels. Also, total phenol increased by reducing nitrogen rate. From results it can be concluded that sorghum phenol compounds may protect cellular structures against active radicals produced in stress conditions and prevent of oxidation of essential oil.