Abstract:Iron is one of essential trace elements for plant growth. The uptake and utilization of iron was influenced by many kinds of factors, such as soil, climate et al, especially the means of fertilizer application which was close related to the biological availability of iron fertilizer and plant and development of plant. The effects of Nano-ferric oxide (Nano-Fe2O3) coordinated with organic fertilizer and humid acid (OM-Fe) on the growth and iron uptake of peanut were studied through a nutrient quartz-sand culture experiment in the greenhouse. The results showed that Nano-Fe2O3 could promote the growth and photosynthesis of peanut significantly. For OM-Fe, the chlorophyll content in peanut leaves was 2.89 (mg/g,) which was significant higher than that of Citric acid iron(CA-Fe). Nano- Fe2O3 coordinated with organic manures could improve the movability of iron in plant corpora, transferring iron into leaves that resulted in a significant increment of iron in leaves. For the treatments of Nano-Fe coordinated with organic fertilizer, Nano-Fe and Nano-Fe coordinated with humic acid(HAs-Fe), the iron content in leaves were 218.95 mg/kg, 207.48 mg/kg and 206.64 mg/kg, respectively. All of them were higher than that of CA-Fe (187.00 mg/kg). As the result, the efficiency of iron increased. Nano-Fe could promote the absorption and utilization of nutrients, such as nitrogen, phosphorus and potassium. Therefore, this study provided a mythology and scientific basis of Nano-Fe2O3 application for a practical purpose.