In comparison to Fe-EDTA under salt stress conditions, a greenhouse experiment was adopted to investigate the effect of nano Fe on the growth, nutrient concentration, and content of sorghum straw, racemes, and entire shoots. Two iron fertilizer sources were sprayed; nano Fe 1.35 g/L, Fe-EDTA 3 g/L, and as a monitor, distilled water was used. As a control, sorghum plants were irrigated by diluted seawater at a rate of 2.5, 5% seawater, and tap water. The findings of the transmission electron microscope (TEM) showed that the form of the nano Fe used was spherical with a mean particle size of 47.67nm. The growth attributes were reduced only by the elevated salinity level. The growth parameters reported in iron-EDTA treatments were, as an unexpected result, superior to those obtained from the nano-iron source, irrespective of the level of salinity. The foliar application of iron EDTA increased by 24.0, 57.6, 22.5, 53.1, 62.2, 39.0, 16.4 and 34.0 percent plant height, fresh weight (fw) of straw, fw of raceme, fw of whole plant, dry weight (dw) of stem, dw of straw, dw of raceme and dw of whole shoot compared to nano-Fe, respectively. As indicated by the presence of four petal flower-like silicon units in SEM micrographs of nano Fe-sprayed leaves, we attributed this finding to the plant's protective response to the nano-iron.
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