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Here we tested plants’ ability to use iron (Fe) from the water-soluble commercial product Humiron ® (a complex of Fe with highly purified and solubilized humic acids extracted from leonardite) as a source of chelated Fe for both strategy 1 (e.g. cucumber) and strategy 2 (e.g. barley) plant species grown under low Fe conditions. Iron from radioactive 59 Fe-labelled Humiron ® can easily be acquired by strategy 1 plant species via reduction of Fe III by the inducible plasma membrane-bound reductase, similarly to the reduction of synthetic Fe III -chelates. Strategy 2 plant species can also efficiently utilize Fe from Humiron ® via ligand exchange between humates and phytosiderophores (PS). Moreover, the efficacy of Humiron ® is comparable to Fe complexed with water-extractable humic substances obtained form peat. Being easily biodegradable this product can be used as an effective Fe source for organic crop production.

Humiron® is an effective biodegradable source of chelated iron for plants: An iron-59 uptake study