Iron (Fe) deficiency is a yield-limiting factor with major implications for field crop production. Fe-deficiency is a worldwide problem, especially severe in calcareous soils. It is estimated that calcareous soils cover about 30% of world´s land surface. The most common practice employed to overcome Fe deficiency in plants is the application of synthetic Fe chelates, constitutedby aminopolycarboxylates (APCAs) compounds, such as ethylenediaminedi(o-hydroxyphenylacetic) acid (EDDHA). (…) Thus, searching cheaper alternative pathways for producing environmental-friendly chelators for Fe fertilization is urgent and deserves further research. (…) However, despite the extensive research, the alleviation of Fe-chlorosis in soybean crops remains a major agronomic problem that stimulates the study of new and cheaper products for fertilizing soils.Therefore, the central aim of this multidisciplinary project is to search for environmental-friendly Fe chelators, with specific properties to be used, as Fe fertilizers for correcting iron deficiencies of soybean plants grown in calcareous soil conditions.