The ability of several iron (II) — Humic complexes to provide available iron to plants under adverse soil conditions

García-Mina, J. M.; Sánchez‐Díaz, Manuel; Iniguez, J.

doi:10.1007/978-94-011-0503-3_34

Cited by 8 publications

(6 citation statements)

References 4 publications

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“…The increased during initial period of 14 days might be due to the coating of Fe-oxides surfaces by the humic acid, thereby decreasing their adsorptivity for metals and thus metals bound under such conditions might be desorbed readily. Humic acid forms complex with Fe and Mn compound in earlier stage of incubation and results in less specific surface area for adsorption of Zn and the results are in conformity with the earlier findings of Garcia et al [20]. Within a column, data followed by the same letter are not significantly different at the 0.05 level of probability by DMRT.…”

Section: Effect Of Humic Acidsupporting

confidence: 91%

Effect of Lime, Humic Acid and Moisture Regime on the Availability of Zinc in Alfisol

Naik

Das

2007

The Scientific World JOURNAL

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Lime and humic acid application can play an important role in the availability of zinc in paddy soils. We conducted laboratory incubation experiments on a rice growing soil (Alfisol) to determine the effect of lime, humic acid and different moisture regimes on the availability of Zn. Addition of half doses of liming material (powdered lime stone) recorded highest values of DTPA-Zn followed by no lime and 100% of lime requirement throughout the incubation period. With the progress of incubation, DTPA-Zn increased slightly during the first week and then decreased thereafter. The highest DTPA-extractable Zn content of 2.85 mg/kg was found in the treatment Zn10 L1/2 at 7 days of incubation, showing 17.3 % increase in DTPA-Zn content over its corresponding treatment of Zn alone (Zn10L0). The DTPA-Zn concentration increased with the application of humic acid compared with no humic acid throughout 35 days of the incubation period and the peak value obtained was 3.12 mg/kg in the treatment Zn10 HA2 at 14 days after incubation, showing 50 % increase in Zn content over its corresponding treatment of Zn alone (Zn10HA0). The application of 0.2% humic acid compared with 0.1% resulted in greater increase in DTPA-Zn concentration in soil application. During the 35 days of incubation, highest values of DTPA-Zn were recorded in soil maintained at saturated compared to water logged conditions. However, under alternate wetting and drying condition the DTPA-Zn content gradually decreased up to 21 days and thereafter increased slowly.

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Section: Effect Of Humic Acidsupporting

confidence: 91%

Effect of Lime, Humic Acid and Moisture Regime on the Availability of Zinc in Alfisol

Naik

Das

2007

The Scientific World JOURNAL

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“…In the absence of siderophores, humic Fe complexes may represent the main Fe species in the pH range from 4 to 7 (Gerke, 1997). Little information is available with respect to the uptake of Fe chelated by humic substances, but some results suggest that the contribution of Fe humate to Fe nutrition can be substantial (Lombartini & Orioli, 1988 ;Garcia-Mina et al, 1995 ;Pinton et al, 1998). However, information on the concentration of humic substances in the soil solution is scarce.…”

Section: Substrates For Reductive Iron Assimilationmentioning

confidence: 99%

Mechanisms and regulation of reduction‐based iron uptake in plants

1999

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Despite the usually high abundance of iron (Fe) in soils, the low solubility of Fe-bearing minerals restricts the available Fe pools in most aerobic soils to levels that are far below those required for microbial or plant growth. To acquire the necessary amounts of Fe from the environment, organisms have evolved mechanisms that enhance the solubility and dissolution rate of Fe() oxyhydroxides prevailing in aerobic soils. Chemically, these mechanisms are based on weakening of the Fe$O bond by reduction, chelation and protonation. Physiologically, two distinct and in all known cases mutually exclusive strategies can be distinguished : the excretion of siderophores capable of solubilizing external ferric Fe and subsequent uptake of the ferric siderophore complex ; and reduction of Fe() prior to uptake of the more soluble Fe# + ion. With the exception of graminaceous species, in which Fe uptake is based on the former mechanism, the latter strategy is found in all cormophytes and certain algae, yeast and bacteria. In higher plants, the increase in their capacity to convert extracellular ferric to ferrous Fe is part of a series of physiological and morphological events that act in concert to achieve appropriate internal levels of Fe. It is this amalgam of features that determines the Fe efficiency of a species or cultivar that in turn affects the yield of economically important plants and the natural distribution of species. Adaptive changes to limited Fe availability have been studied at the molecular, physiological and whole-plant level. This review summarises current knowledge of the components of reduction-based Fe uptake in plants and presents an integrated view of the present understanding of mechanisms that control the rate and extent of Fe absorption by roots.

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“…Mitigating effect of HA in Fe-ions and HA complexes could be explained by the fact that Fe(II) and Fe(III) are strongly bound to acidic functional groups of HAs [ 63 , 64 , 65 , 66 , 67 ]. It has been reported that complexes of Fe 2+ and Fe 3+ with humic acids increased Fe-uptake in plants Garcia [ 38 ]. These results are coherent with the fact that after the addition of humic acids Fe 2+ and Fe 3+ became less toxic to plants ( Table 4 ).…”

Section: Resultsmentioning

confidence: 99%

“…For the preparation of Fe-HA complexes, a stock solution of the HA (50 mg/L) was prepared by dissolving powdered HA in deionized water with drop-wise addition of 0.1 M NaOH till a final pH = 8. Then, Fe(II) and/or Fe(III) chloride stock solutions (FeCl 2 ·4H 2 O, FeCl 3 ∙6H 2 O, 1000 mg/L) were added to HA stock (pH 8.0), to obtain the final ratio HA:Fe(II)/Fe(III) in each series of 1:0.15 according to [ 38 ].…”

Section: Methodsmentioning

confidence: 99%

Effects of Humic Acids on the Ecotoxicity of Fe3O4 Nanoparticles and Fe-Ions: Impact of Oxidation and Aging

et al. 2020

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The magnetite nanoparticles (MNPs) are increasingly produced and studied for various environmental applications, yet the information on their ecotoxicity is scarce. We evaluated the ecotoxicity of MNPs (~7 nm) before and after the addition of humic acids (HAs). White mustard Sinapis alba and unicellular ciliates Paramecium caudatum were used as test species. The MNPs were modified by HAs and oxidized/aged under mild and harsh conditions. Bare MNPs proved not toxic to plants (96 h EC50 > 3300 mg/L) but the addition of HAs and mild oxidation increased their inhibitory effect, especially after harsh oxidation (96 h EC50 = 330 mg/L). Nevertheless, all these formulations could be ranked as ‘not harmful’ to S. alba (i.e., 96 h EC50 > 100 mg/L). The same tendency was observed for ciliates, but the respective EC50 values ranged from ‘harmful’ (24 h EC50 = 10–100 mg/L) to ‘very toxic’ (24h EC50 < 1 mg/L). The ecotoxicity of Fe-ions with and without the addition of HAs was evaluated in parallel: Fe (II) and Fe (III) ions were toxic to S. alba (96 h EC50 = 35 and 60 mg/L, respectively) and even more toxic to ciliates (24 h EC50 = 1 and 3 mg/L, respectively). Addition of the HAs to Fe-ions yielded the respective complexes not harmful to plants (96h EC50 > 100 mg/L) but toxic to ciliates (24h EC50 = 10–100 mg/L). These findings will be helpful for the understanding of the environmental fate and toxicity of iron-based NPs.

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The ability of several iron (II) — Humic complexes to provide available iron to plants under adverse soil conditions

Cited by 8 publications

References 4 publications

Effect of Lime, Humic Acid and Moisture Regime on the Availability of Zinc in Alfisol

Effect of Lime, Humic Acid and Moisture Regime on the Availability of Zinc in Alfisol

Mechanisms and regulation of reduction‐based iron uptake in plants

Effects of Humic Acids on the Ecotoxicity of Fe3O4 Nanoparticles and Fe-Ions: Impact of Oxidation and Aging

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