Synthetized nanoparticles are believed power factors for agri-fertilizers and evolution boosters. Micro-nutrients (Cu/Mn/Fe/Zn) grafted on iron oxide nanocomposite in agricultural systems, particularly world-wide crop production. Nano-micronutrients are strong candidates for immobilization of agricultural contaminants in soils and water. This article aimed to investigate the influence of nano-micronutrients grafted on iron oxide nanoparticles to reduce the harmful effect of water irrigation salinity through neutralizing sodium and chloride ions to plant. Also, increasing growth, photosynthesis, respiration, and leaf mineral content of wheat, rice and corn maize plants. Iron/micronutrients nanocomposite activated proline synthesis, and increased tolerance to salinity stress. The BET/FT-IR/XRD and scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM/EDX) are characterizing the nano products.  Brunauer-Emmett-Teller (BET) found the average pore diameter at 3.69 and median pore diameter at 30.57. T- Plot/ Langmuir adsorption besides an isotherm, illustrated the thickness of desorbate layers on a non-porous surface of iron oxide. T/MP-plot is applicable to desorbents containing macro pores, mesoporous, and micro pores. This nano size gave the simplicity penetration of nano-micronutrients of leaves and stems of plants. The best pH value of nanocomposite solution was from 6.5 to 7.8 at room temperature. The average dilution of concentrated nanocomposite solution to irrigation water was 1/400 nanofertilizer to irrigation water. The optimal nanocomposite dose was 100 mg/L. The resulted data, in case of wheat, rice and corn maize gave the highest yield at 22.30%, 21.42% and 29.10%, respectively at 100 ppm of nanocomposite with foliar fertilization.