Iron deficiency chlorosis (IDC) is a serious environmental problem affecting the growth of several crops in the world. Soil application of synthetic Fe (III) chelates is still one of the most common measures to correct IDC and the search for more effective Fe chelates remains an important issue. Herein, we will analyse the effectiveness of tris (3-hydroxy-4-pyridinonate) iron(III) complexes, Fe(dmpp)3 and Fe (mpp)3, as well as others, as new IDC correctors. Different morphological, biochemical and molecular parameters will be assessed as a first step towards understanding their mode of action, compared with that of the commercial fertilizer FeEDDHA, in soybean (Glycine max L.) plants.