Document Type: main article
Department of Plant Production and Genetics, Faculty of Agriculture, University of Maragheh, P.O. Box 55181-83111, Maragheh, Iran.
Young Researchers and Elite Club, Zanjan Branch, Islamic Azad University, Zanjan, Iran.
This study was conducted to investigate the effect of soil application of nitrogen (N) and iron (Fe) fertilizers on morphological characteristics, shoot Fe and some nutrient (Zn, Cu and Mn) concentrations in wheat (Triticum aestivum L. cv. Kohdasht). For this purpose, nitrogen treatments were 100 (low), 200 (medium) or 400 mg (high N) N kg−1 dry soil applied as Ca(NO3)2, and also Iron was applied at the rate of 10 mg Fe kg−1 soil in forms of FeEDTA or FeSO4. The results of the present study show that shoot fresh matter production and plant height was significantly enhanced by increasing N supply at each Fe treatment. So that, application of 400 mg N kg−1 soil has the greatest effect on shoot fresh matter production and plant height. Compared with the control treatment, which did not receive extra N fertilizer, N fertilization at 200 and 400 mg kg−1 were decreased shoot Fe, Cu and Mn concentration as well as shoot Zn and Cu content in wheat. The mean shoot Fe concentrations were 246.9, 247.3 and 314.9 mg kg−1 in control, FeEDTA and FeSO4 treatments, respectively. Also, the effect of FeSO4 on shoot Zn, Fe and Mn concentrations and also shoot Zn and Cu contents were higher than that of FeEDTA. In generally, the higher shoot concentration and content of mineral nutrients were observed on the FeSO4 treatment in 100 mg N kg−1 soil and the lower these traits were observed on the treatment of no Fe at all of soil N supply. Application of Fe fertilizer, in combination with optimum N fertilization or other agronomic practices that can increase mineral nutrients in shoot and grain of wheat (especially Zn and Fe), is required to produce improved grain quality for human health.