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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.


Distribution of the ligand (expressed as molar percentage) initially included as Mn (initial value 64%) and Zn chelates (initial value 36%) in each formulation determined by modeling at pe+pH 15 and 18 fixed redox conditions.
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Figure 2: Distribution of the ligand (expressed as molar percentage) initially included as Mn (initial value 64%) and Zn chelates (initial value 36%) in each formulation determined by modeling at pe+pH 15 and 18 fixed redox conditions.

Mentions: In Figure 2, the distribution of the ligand (expressed as molar percentage) in the theoretical model, initially included as Mn (initial value 64%) and Zn chelates (initial value 36%) is presented for each formulation. In most of the formulations, both chelated Zn and Mn were partially or totally displaced in soil conditions. In the acid–neutral soils, this was mainly due to the formation of the Fe chelates, which decreased in the oxidized soil. A complete Mn and Zn displacement by Fe took place in the formulations that were applied as o,o-EDDHA and o,p-EDDHA. In agreement with this, the formulations that were applied as sulfates did not produce any chelated Mn or Zn.


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)

Distribution of the ligand (expressed as molar percentage) initially included as Mn (initial value 64%) and Zn chelates (initial value 36%) in each formulation determined by modeling at pe+pH 15 and 18 fixed redox conditions.
© Copyright Policy
Related In: Results  -  Collection

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

Figure 2: Distribution of the ligand (expressed as molar percentage) initially included as Mn (initial value 64%) and Zn chelates (initial value 36%) in each formulation determined by modeling at pe+pH 15 and 18 fixed redox conditions.
Mentions: In Figure 2, the distribution of the ligand (expressed as molar percentage) in the theoretical model, initially included as Mn (initial value 64%) and Zn chelates (initial value 36%) is presented for each formulation. In most of the formulations, both chelated Zn and Mn were partially or totally displaced in soil conditions. In the acid–neutral soils, this was mainly due to the formation of the Fe chelates, which decreased in the oxidized soil. A complete Mn and Zn displacement by Fe took place in the formulations that were applied as o,o-EDDHA and o,p-EDDHA. In agreement with this, the formulations that were applied as sulfates did not produce any chelated Mn or Zn.

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.