عنوان مقاله [English]
نویسندگان [English]چکیده [English]
In order to investigate the effects of different amounts of iron (1, 2 and 3 g L-1) in different stages of plant growth (20, 40, 60, 80 and 100 percent of ground cover for Beta vulgaris cv. AZARE) on the efficiency of iron consumption a factorial experiment conducted based on a randomized complete block design with three replications at Research Farm of Azar Ghand Naqadeh Factory in 2011. Analysis of variance showed the significant interaction effect of iron × foliar spraying time on the Fe Use Efficiency (FeUE) for production of leaf protein, aerial parts protein, root dry weight, biomass and sugar yield. The highest FeUE for leaf protein (568) was obtained from 1 g L-1 at 40% of ground cover. While, the highest FeUE for aerial parts protein (1080), root dry weight (41769), biomass (98009) and sugar yield (128152) were observed in Nano-iron foliar application (1 g L-1) at 80% of ground cover. Reduction in FeUE along with higher concentration of iron spraying indicated low diminishing returns for this micro nutrient.