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Heptagluconic acid vs. EDTA

Complexing agents, also known as chelating agents, are chemical compounds that enclose the metal cation like scissors (two or four teeth) and thus protect the metal from becoming absorbed into the soil while facilitating intake via the leaf and storage in the plant.

Which plant nutrients can be chelated?

Manganese, copper, zinc, iron, calcium and magnesium, etc.

The most commonly used chelating agents so far are EDTA, DTPA, EDDHA and HEDTA, while organic complexing agents such as lignosulphonate and citric acid have also been used.

By the latest publication of EC Regulation 2016/1618, sodium heptagluconate has been added as a complexing agent.

What does that mean for agriculture?

Heptagluconic acid as a complexing agent
  • offers an environmentally friendly alternative due to its easy biodegradability (no accumulation in the soil and groundwater)
  • is especially suitable for foliar application, as it is very gentle and acts without phytotoxicity potential, even in greater quantities
  • is stable in the pH value range 2 - 12
  • is highly water-soluble
  • offers very good cost-effectiveness
  • has a miscibility profile comparable to the known chelating agents
  • What’s more, it displays high stability in alkaline environments.
    Lebosol®-HeptaEisen is suitable as soil fertilizer as well
  • can be used in fertigation
  • Sugar is used as the starting material to manufacture heptagluconic acid.
  • is suitable for use in organic agriculture and listed by the German Research Institute of Organic Agriculture (FiBL) as inputs.

 Lebosol® Hepta:

“Not only carboxylic acids, but true/real complexes”

5% manganese (65 g/l Mn)
(Manganese complex with heptagluconic acid)
6% zinc (78 g/l Zn)
(Zinc complex with heptagluconic acid)
5% copper (60 g/l Cu)
(Copper complex with heptagluconic acid)
4.5% iron (56 g/l Fe)
(Iron fertiliser solution with heptagluconic acid)