Abstarct: Micronutrient deficiency reduces yield and quality of plants and endanger human health and the herbivores. Amongst which, iron (Fe) and magnesium (Mg) are essential elements in photosynthesis and activity of many enzymes. They also involve in protein and RNA synthesis. Accordingly, A field trial was performed for the analysis of some morphological and physiological traits of black eyed pea (Vigna sinensis L.) following the foliar application of Mg and Fe. Factorial experiments on the basis of completely randomized block design with three replications were carried out for both iron (0, 0.25 and 0.5 gram per liter of nano - Fe and Fe) and magnesium (0 and 1% w/v of nano - Mg and Mg). Foliar application of the elements was carried out twice (57 and 74 days post sowing date). Results showed that morphological characteristics such as dry weight of leaves, stems, seeds and pods, stem height, stem diameter, number of leaf, number of lateral branches, pod length and the distance of first pod from ground was affected by foliar applications of iron and magnesium per plant. The highest yield resulted from the application of Fe (0.5 g/l) × nano - Mg with mean of 2377.73 kg/h, while the lowest values were for the nano - Mg (792/55 kg/h). Number of pods per plant and seed weight were the main factors influencing. The incline of yield upon the treatmeant with 0.5 g/l Fe + nano - Mg. Whereas, amongst the yield components, number of seeds per pod were the highest when Fe + Mg applied. Once Fe applied, treating the plants with magnesium reduced plasma membrane damage and increased chlorophyll level till growth mid season. Seed protein content increased about 22.35 percent through application of nano Fe. In summary, foliar application of nano - Fe + Mg had the greater effect in compartion to other treatments.