Environmental pollution resulted from excess accumulation of wastes by the growing population is a seriouse concern worldwide. Sloutherhouse wastes including blood are considereed as improtant sources of environmental pollution particularly in Iran. Now, most of these wastes are disposed by landfilling or dumping, which leads to several environmental problems. The aim of this research work was to find a modern and economic method to recycle slautherhouse blood and reduce the corresponding environmental problems. The possiblity of amino acid extraction from slaugherhouse blood in order to synthesis of metal amino chelates as Fe fertilizer source was tesed. The experiment was conducted in two parts. In the first part, fresh blood samples were collected at different times from slautherhouses of Najaf-Abad in Isfahan province and Parto in Qom province. The blood sampes were hydrolyzed with HCl (acidic hydrolysis) and NaOH (alkaline hydrolysis) at three concentrations (1, 3, and 6 M), four temperatures (5, 120, 180, and 200 0 C) and six reaction times (1, 5, 6, 12, 24 , and 48 h). Based on the results obtained, temperature as the most effective factor, significantly affceted the recovery of amino acids from blood hydrolysis and increasing the temperature from 50 0 C to 180 0 C resulted in higher amino acid concentrations in the extracts. Despite of the reaction temperature and time, increasing concentration of HCl from 1 M to 3 M reslted in lower extraction of amino acids from the whole blood. The highest amino acids were extracted from the hydrolysis of blood with HCl 6 M at 200 0 C for 6 h. In the second part, Fe-amino acid chelate was synthesized using the amino acids extracted from the slaughterhouse blood (Fe-BAA) and its efficacy to supply Fe was compared with FeEDTA, Fe-lysin (Fe-Lys), and Fe-methionine (Fe-Met). Three indivisual nutrient solution experiments, each one as completely block design in triplicates was conducted. In the first experiment, different Fe chelates were used in nutrient solutions (root uptake) as Fe source, in the second experiment, Fe chelates were used as foliar application for the plants grown at the Fe-free nutrient solution and in the third experiment, Fe chelates were added to the Fe-free nutrient solution after appearance of Fe-deficiency symptoms. At harvest, shoot and root dry mass, leaf concentration of Fe, Zn, Mn, chlorophyll a and b and caretoneoides as well as activity of Fe-depending enzymes i.e., catalase (CAT) and ascorbate peroxidase (APX) were measured. Application of Fe, regardless of applied source, significantly enhanced shoot dry mass of corn as compared with the control. In the second and third experiments, the highest root and shoot dry mass was obtained by Fe-BAA. The lowest shoot and root dry mass was produced at the Fe-Met treatment. At all Fe treatments except control (Fe-free treatment), shoot Fe concentration was higher than its critical deficiency level while Fe-chlorosis symptoms were observed on the plants supplied with FeEDTA and Fe-Met. The plants supplied with Fe-BAA had the highest activity of CAT and APX and chlorophyll concentration. The intensity of chlorosis symptoms was corrlated with leaf chlorophyll concentration. In experiments 2 and 3, activity of CAT in the plants supplied with Fe-BAA was significantly higher than those supplied with FeEDTA and the control plants. According to the results, Fe-chelate synthesized with blood amino acids might be used as a suitable source of Fe for plants. Keywords: Amino acid, Ascorbate Peroxidase, Catalase, Fe-chelate, Hydrolysis, Slaughterhouse blood.