Find out more about our chelates.
Select a chelating agent:
Biodegradable, high quality liquid and microgranular fertilisers for soil application, fertigation, hydroponic management and foliar spray. Also available with “2.0” technology.
Spatial structure of the Fe(III)IDHA chelate molecule
The IDHA chelating agent forms three-dimensional structures while binding to di- and tri-valent metal ions such as copper, zinc, manganese and iron. The exact structure form depends on the metal’s coordination number. The figure below shows the three-dimensional structure of the Fe(III)IDHA chelate. Donor atoms of the chelating agent are arranged in octahedron vertices, forming coordinate and ionic bonds which surround the metal atom. The iron atom (marked in grey) is found in the centre of the octahedron, which is defined by the symmetry axis intersection.
In the corners of the plane intersecting the iron atom, there are donor oxygen atoms derived from the carboxyl groups of the chelating agent (red). In one of the octahedron vertices, there is a nitrogen atom derived from an amino group of the IDHA agent (green) and bonded by a coordination bond to iron. In the second octahedron vertex, there is a water molecule. The iron atom is bound to donor atoms of the chelating agent and they form a heterocyclic pentadentate ring. This ring features an iron atom, an oxygen atom, a nitrogen atom and one or two carbon atoms (black) derived from the IDHA molecule.
This spatial structure ensures high stability of the micronutrient in aqueous solutions. These solutions are recommended for application by fertigation and by foliar feeding of crops.
Fe(III)IDHA is also available in the “2.0” formulation, which is specifically adapted for effective foliar feeding of crops.
The colour of IDHA chelates depends on the properties of the chelated metal. The red-orange colour of the Fe(III)IDHA indicates the presence of a stable iron form in aqueous solutions.
ADOB® IDHA chelates
| Nutrient | Brand | Form |
|---|---|---|
| Ca | ADOB® Ca IDHA – 10% | microgranular |
| ADOB® 2.0 Ca IDHA – 10% | microgranular | |
| Cu | ADOB® Cu IDHA – 4.5% | aqueous solution |
| ADOB® 2.0 Cu IDHA – 4.5% | aqueous solution | |
| ADOB® Cu IDHA – 10% | microgranular | |
| ADOB® 2.0 Cu IDHA – 10% | microgranular | |
| Fe | ADOB® Fe IDHA – 3% | aqueous solution |
| ADOB® 2.0 Fe IDHA – 3% | aqueous solution | |
| ADOB® Fe IDHA – 3.8% | aqueous solution | |
| ADOB® 2.0 Fe IDHA – 3.8% | aqueous solution | |
| ADOB® Fe IDHA – 9% | microgranular | |
| ADOB® 2.0 Fe IDHA – 9% | microgranular | |
| Mg | ADOB® Mg IDHA – 7.5% | microgranular |
| ADOB® 2.0 Mg IDHA – 7.5% | microgranular | |
| Mn | ADOB® Mn IDHA – 9% | microgranular |
| ADOB® 2.0 Mn IDHA – 9% | microgranular | |
| Zn | ADOB® Zn IDHA – 4.4% | aqueous solution |
| ADOB® 2.0 Zn IDHA – 4.4% | aqueous solution | |
| ADOB® Zn IDHA – 10% | microgranular | |
| ADOB® 2.0 Zn IDHA – 10% | microgranular |
High quality liquid and microgranular fertilisers for soil application, fertigation, hydroponic management and foliar spray.
Spatial structure of the Fe(III)EDTA chelate molecule
EDTA is the most extensively applied and best-known chelating agent worldwide. EDTA bonds to di- and tri-valent metal ions, forming a three-dimensional structure. The figure below shows the typical three-dimensional structure of the Fe(III)EDTA chelate. The donor atoms of the chelating agent are located at the octahedron vertices, forming coordinate- and ionic- bonds. These surround the iron atom, which is found in the centre of the octahedron (marked in grey).
The aminopolycarboxylic acid EDTA has six ligand atoms (four oxygen atoms and two nitrogen atoms). In the corners of the plane intersecting the iron atom, there are two donor oxygen atoms derived from carboxyl groups (red) and two donor nitrogen atoms derived from an amino group of the chelating agent (green). Two further oxygen atoms, belonging to the chelating agent EDTA, are located in the octahedron vertices. The iron atom is bound to the donor atoms of the chelating agent and they form heterocyclic pentadentate rings. These rings feature an iron atom, an oxygen atom, one or two nitrogen atoms and one or two carbon atoms (black) derived from the EDTA molecule.
This spatial structure ensures high stability of the micronutrient in aqueous solutions used for spraying and fertigation with Fe(III)EDTA chelate.
ADOB® EDTA chelates
| Nutrient | Brand | Form |
|---|---|---|
| Ca | ADOB® Ca EDTA – 14% | microgranular |
| Cu | ADOB® CuK2 EDTA – 7% | aqueous solution |
| ADOB® Cu EDTA – 7.4% | aqueous solution | |
| ADOB® Cu(NH4)2 EDTA – 9% | aqueous solution | |
| ADOB® Cu EDTA – 15% | microgranular | |
| ADOB® Cu(NH4)2 EDTA – 15.5% | microgranular | |
| Fe | ADOB® Fe EDTA – 5% | aqueous solution |
| ADOB® FeK EDTA – 5.8% | aqueous solution | |
| ADOB® Fe(NH4)2 EDTA – 7.7% | aqueous solution | |
| ADOB® FeK EDTA – 13% | microgranular | |
| Mg | ADOB® Mg EDTA – 10% | microgranular |
| Mn | ADOB® Mn EDTA – 5.8% | aqueous solution |
| ADOB® MnK2 EDTA – 6.1% | aqueous solution | |
| ADOB® MnK2 EDTA – 12.5% | microgranular | |
| ADOB® Mn EDTA – 13% | microgranular | |
| Zn | ADOB® ZnK2 EDTA – 6.7% | aqueous solution |
| ADOB® Zn EDTA – 7.2% | aqueous solution | |
| ADOB® Zn(NH4)2 EDTA – 9.3% | aqueous solution | |
| ADOB® ZnK2 EDTA – 14.5% | microgranular | |
| ADOB® Zn EDTA – 15% | microgranular |
High quality liquid and microgranular fertilisers for soil application, fertigation and hydroponic management at slightly alkaline conditions.
Spatial structure of the Fe(III)DTPA chelate molecule
DTPA is one of the strongest aminopolycarboxylic acids. DTPA bonds to di- and tri-valent metal ions are very stable and form three-dimensional structures. The figure below shows the typical three-dimensional structure of the Fe(III)DTPA chelate. Donor atoms of the chelating agent are arranged in octahedron vertices, forming coordinate and ionic bonds, which surround the iron atom. The aminopolycarboxylic acid DTPA has no fewer than seven ligand atoms (four oxygen atoms and three nitrogen atoms).
The iron atom (marked in grey) is found in the centre of the octahedron, which is defined by the symmetry axis intersection. In the corners of the plane intersecting the iron atom, there are two donor oxygen atoms derived from the carboxyl groups (red) and two donor nitrogen atoms derived from an amino group of the chelating agent (green). On the same plane, there is also a third nitrogen atom, derived from the DTPA molecule. Two further oxygen atoms, belonging to the chelating agent, are located in the octahedron vertices. The iron atom is bound to donor atoms of the chelating agent and they form a heterocyclic pentadentate ring. This ring features an iron atom, an oxygen atom, one or two nitrogen atoms and one or two carbon atoms (black) derived from the DTPA molecule.
This spatial structure ensures very high stability of the micronutrient in aqueous solutions. These solutions are recommended for both fertigation and direct soil application.
ADOB® DTPA chelates
| Nutrient | Brand | Form |
|---|---|---|
| Fe | ADOB® Fe(NH4)2 DTPA – 6% | aqueous solution |
| ADOB® Fe DTPA – 7% | microgranular | |
| ADOB® FeK DTPA – 11% | microgranular | |
| ADOB® Fe DTPA – 11% | microgranular | |
| Mn | ADOB® Mn DTPA – 3.5% | aqueous solution |
| ADOB® Mn DTPA – 7% | microgranular | |
| Zn | ADOB® Zn DTPA – 3.6% | aqueous solution |
High quality Fe and Zn chelates for soil application, fertigation and hydroponic management at high pH conditions.
Spatial structure of the Fe(III)HBED chelate molecule
The chelating agent HBED forms three-dimensional structures with di- and tri-valent ions, such as zinc(II) and iron(III). During the process of chelation (i.e. bonding a micronutrient metal to the chelating agent), an octahedral three-dimensional structure is formed. On this plane there is an iron atom (grey) bound by donor atoms (two nitrogen atoms (green) and two oxygen atoms (red) derived from the phenolate groups). In the next stage of chelation, iron is bound by two oxygen atoms (red) derived from carboxyl groups in an axial and equatorial position compared to the formed plane. HBED does not have chiral carbons so it does not form optical isomers when bonding with micronutrient metals.
This spatial structure ensures high stability of the micronutrient in aqueous solutions and when applied by soil fertilisation. Thanks to its high stability, HBED is the definitive chelating agent for application of iron and zinc in mild to strong alkaline soils, as well as for fertigation and hydroponics.
The red colour of the Fe(III)HBED indicates the presence of a stable iron form in aqueous solutions.
ADOB® HBED chelates
| Nutrient | Brand | Form |
|---|---|---|
| Fe | ADOB® Fe HBED – 3% | aqueous solution |
| ADOB® Fe HBED – 7% | crystalline | |
| Zn | ADOB® Zn HBED – 7% | crystalline |