Abstract
In the past several years, concern about the environmental fate of recalcitrant synthetic ligands (e.g., EDTA) has increased. The used of new biodegradable chelating agents such as imidodisuccinic acid (IDHA) has been proposed as an alternative. However, its application as an iron ligand to correct iron chlorosis in agriculture has not yet been studied. Then the objective of this work is to determine the fertilizer capacity of IDHA/Fe3+ using interaction assays with soils and soil materials and evaluating Fe nutrition of efficient and susceptible plants. Interaction of IDHA/Fe3+ with soil materials produces a reduction of the amount of soluble Fe. This is in good agreement with studies on the stability of the IDHA/Fe3+ chelate. In general, plant response to IDHA/Fe3+ in hydroponics is acceptable and better than that to EDTA/Fe3+. This good behavior seems to be related to the lower coordination of the iron in IDHA/Fe3+ with respect to EDTA/Fe3+.
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