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Reactivity and effectiveness of traditional and novel ligands for multi-micronutrient fertilization in a calcareous soil.

López-Rayo S, Nadal P, Lucena JJ - Front Plant Sci (2015)

Bottom Line: The application of traditional or novel ligands in formulations did not result in sufficient plant Mn concentrations, which was related to the low Mn stability observed for all formulations under moderate oxidation conditions.The results highlight the need to consider the effect of metals and ligands interactions in multi-nutrient fertilization and the potential of S,S-EDDS to be used for Zn fertilization.Furthermore, it is necessary to explore new sources of Mn fertilization for calcareous soils that have greater stability and efficiency, or instead to use foliar fertilization.

View Article: PubMed Central - PubMed

Affiliation: Department of Agricultural and Food Chemistry, Faculty of Science, Autonomous University of Madrid Madrid, Spain.

ABSTRACT
This study compares the effectiveness of multi-micronutrient formulations containing iron (Fe), manganese (Mn), and zinc (Zn) with traditional (EDTA, DTPA, HEEDTA, and EDDHAm) or novel chelates (o,p-EDDHA, S,S-EDDS, and IDHA) and natural complexing agents (gluconate and lignosulfonate). The stability and reactivity of the formulations were studied on batch experiments with calcareous soil and by speciation modeling. Formulations containing traditional ligands maintained higher Mn but lower Zn concentration in soil solution than the novel ligands. The gluconate and lignosulfonate maintained low concentrations of both Mn and Zn in soil solution. Selected formulations were applied into calcareous soil and their efficacy was evaluated in a pot experiment with soybean. The formulation containing DTPA led to the highest Zn concentration in plants, as well as the formulation containing S,S-EDDS in the short-term, which correlated with its biodegradability. The application of traditional or novel ligands in formulations did not result in sufficient plant Mn concentrations, which was related to the low Mn stability observed for all formulations under moderate oxidation conditions. The results highlight the need to consider the effect of metals and ligands interactions in multi-nutrient fertilization and the potential of S,S-EDDS to be used for Zn fertilization. Furthermore, it is necessary to explore new sources of Mn fertilization for calcareous soils that have greater stability and efficiency, or instead to use foliar fertilization.

No MeSH data available.


CND indices for Fe, Mn, Zn, and Cu in the leaf of soybean plants 7 and 20 DAT. T-1 (o,o-EDDHA/Fe3+ MnZn–EDTA), was used as the norm so its value for all micronutrients is 0.
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Figure 3: CND indices for Fe, Mn, Zn, and Cu in the leaf of soybean plants 7 and 20 DAT. T-1 (o,o-EDDHA/Fe3+ MnZn–EDTA), was used as the norm so its value for all micronutrients is 0.

Mentions: Pearson’s correlation coefficient was additionally analyzed by comparing mean values from all pairs of nutritional status indices at each sampling time. Positive and significant correlations were found at the end of the assay (20 DAT) between SPAD and Fe concentration in leaf (0.423*) and between ID and Mn concentration in leaf (0.561**). The results obtained for Fe, Mn, Zn and Cu CND indices at 7 and 20 DAT are shown in Figure 3. All treatments had to negative indices for Fe, with the lowest index for formulation containing FeZn–EDDHAm and Mn–EDTA (T-5) at both sampling times. When Fe was added as o,o-EDDHA/Fe3+, the Fe indices were close to the norm and similar to the control (containing o,o-EDDHA/Fe). A positive Mn index was only observed when Mn was applied as EDTA in combination with EDDHAm (T-5) at 20 DAT. Large differences were obtained in Zn indices among the treatments. The formulation with DTPA led to positive values at both sampling times and negative values with all other combinations. The formulation with EDDHAm (T-4) had a remarkably low Zn index as compared to other treatments. The range of Cu indices observed was smaller than those for the other nutrients (Figure 3); for all combinations, indices were positive, and negative for the control.


Reactivity and effectiveness of traditional and novel ligands for multi-micronutrient fertilization in a calcareous soil.

López-Rayo S, Nadal P, Lucena JJ - Front Plant Sci (2015)

CND indices for Fe, Mn, Zn, and Cu in the leaf of soybean plants 7 and 20 DAT. T-1 (o,o-EDDHA/Fe3+ MnZn–EDTA), was used as the norm so its value for all micronutrients is 0.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4585085&req=5

Figure 3: CND indices for Fe, Mn, Zn, and Cu in the leaf of soybean plants 7 and 20 DAT. T-1 (o,o-EDDHA/Fe3+ MnZn–EDTA), was used as the norm so its value for all micronutrients is 0.
Mentions: Pearson’s correlation coefficient was additionally analyzed by comparing mean values from all pairs of nutritional status indices at each sampling time. Positive and significant correlations were found at the end of the assay (20 DAT) between SPAD and Fe concentration in leaf (0.423*) and between ID and Mn concentration in leaf (0.561**). The results obtained for Fe, Mn, Zn and Cu CND indices at 7 and 20 DAT are shown in Figure 3. All treatments had to negative indices for Fe, with the lowest index for formulation containing FeZn–EDDHAm and Mn–EDTA (T-5) at both sampling times. When Fe was added as o,o-EDDHA/Fe3+, the Fe indices were close to the norm and similar to the control (containing o,o-EDDHA/Fe). A positive Mn index was only observed when Mn was applied as EDTA in combination with EDDHAm (T-5) at 20 DAT. Large differences were obtained in Zn indices among the treatments. The formulation with DTPA led to positive values at both sampling times and negative values with all other combinations. The formulation with EDDHAm (T-4) had a remarkably low Zn index as compared to other treatments. The range of Cu indices observed was smaller than those for the other nutrients (Figure 3); for all combinations, indices were positive, and negative for the control.

Bottom Line: The application of traditional or novel ligands in formulations did not result in sufficient plant Mn concentrations, which was related to the low Mn stability observed for all formulations under moderate oxidation conditions.The results highlight the need to consider the effect of metals and ligands interactions in multi-nutrient fertilization and the potential of S,S-EDDS to be used for Zn fertilization.Furthermore, it is necessary to explore new sources of Mn fertilization for calcareous soils that have greater stability and efficiency, or instead to use foliar fertilization.

View Article: PubMed Central - PubMed

Affiliation: Department of Agricultural and Food Chemistry, Faculty of Science, Autonomous University of Madrid Madrid, Spain.

ABSTRACT
This study compares the effectiveness of multi-micronutrient formulations containing iron (Fe), manganese (Mn), and zinc (Zn) with traditional (EDTA, DTPA, HEEDTA, and EDDHAm) or novel chelates (o,p-EDDHA, S,S-EDDS, and IDHA) and natural complexing agents (gluconate and lignosulfonate). The stability and reactivity of the formulations were studied on batch experiments with calcareous soil and by speciation modeling. Formulations containing traditional ligands maintained higher Mn but lower Zn concentration in soil solution than the novel ligands. The gluconate and lignosulfonate maintained low concentrations of both Mn and Zn in soil solution. Selected formulations were applied into calcareous soil and their efficacy was evaluated in a pot experiment with soybean. The formulation containing DTPA led to the highest Zn concentration in plants, as well as the formulation containing S,S-EDDS in the short-term, which correlated with its biodegradability. The application of traditional or novel ligands in formulations did not result in sufficient plant Mn concentrations, which was related to the low Mn stability observed for all formulations under moderate oxidation conditions. The results highlight the need to consider the effect of metals and ligands interactions in multi-nutrient fertilization and the potential of S,S-EDDS to be used for Zn fertilization. Furthermore, it is necessary to explore new sources of Mn fertilization for calcareous soils that have greater stability and efficiency, or instead to use foliar fertilization.

No MeSH data available.