Key Roles of Size and Crystallinity of Nanosized Iron Hydr(oxides) Stabilized by Humic Substances in Iron Bioavailability to Plants

• DOI: 10.1021/acs.jafc.7b03955
• Publication Date: 2017-12-05T20:13:50Z
• Authors: Natalia A. Kulikova; Alexander Yu. Pol...; Vasily A. Lebedev; Dmitry P. Abroskin; Dmitry S. Volkov; Denis A. Pankratov; Olga I. Klein; Svetlana V. Senik; Tatiana A. Sorkina; Alexey V. Garshev; Alexey A. Veligzh...; Jose M. Garcia Mina; Irina V. Perminova
• Keywords: X-Ray Diffraction; Iron; Hydroxides; Biological Availability; Nanoparticles; 0401 agriculture, forestry, and fisheries; 04 agricultural and veterinary sciences; Particle Size; Fertilizers; Humic Substances; Triticum

Availability of Fe in soil to plants is closely related the presence humic substances (HS). Still, systematic data on applicability iron-based nanomaterials stabilized with HS as a source for plant nutrition are missing. The goal our study was establish connection between properties materials by and their bioavailability plants. We have prepared two samples leonardite HS-stabilized substantially different using reported protocols studied physical chemical state relation iron uptake other biological effects. used Mössbauer spectroscopy, XRD, SAXS, TEM conclude speciation, size, crystallinity. One material (Fe-HA) consisted polynuclear iron(III) (hydr)oxide complexes, so-called ferric polymers, distributed matrix. These complexes composed predominantly amorphous small-size components (<5 nm) inclusions larger crystalline particles (the mean size (11 ± 4) nm). well-crystalline feroxyhyte (δ'-FeOOH) NPs transverse sizes (35 20) nm small amounts HS. Bioavailability studies were conducted wheat under conditions deficiency. shown that polymers readily translocated into leaves level Fe-EDTA, whereas relatively large mostly sorbed roots. obtained consistent exclusion limits cell wall pores (5-20 Both demonstrated distinct beneficial effects respect photosynthetic activity lipid biosynthesis. results might be use production tailored availability They can applied only well combination elements, example, industrial "nanofortified" macrofertilizers (NPK).