Chelated zinc is a form of the micronutrient zinc that has been chemically bound to an organic molecule called a chelating agent. This process, known as chelation, protects the zinc ion (Zn²⁺) and keeps it soluble, stable, and more easily available for plant uptake.
In normal conditions, free zinc ions from simple salts like zinc sulfate can quickly react with other substances in the soil—such as phosphates, carbonates, or calcium—and become insoluble. When this happens, plants cannot absorb the zinc efficiently. Chelation prevents these unwanted reactions.
A common chelating agent used is EDTA (Ethylenediamine Tetraacetic Acid), which forms a stable ring-like structure around the zinc ion. This structure keeps the zinc in a form that remains dissolved in water and accessible to plant roots and leaves.
Chelated zinc is widely used in agriculture, horticulture, and hydroponics because it improves zinc availability, especially in alkaline or calcareous soils where zinc deficiency is common. It can be applied through soil, fertigation systems, or foliar sprays.
Zinc itself is an essential micronutrient for plants. It plays a key role in enzyme activation, growth hormone (auxin) production, protein synthesis, chlorophyll formation processes, and overall plant growth and development. Using chelated zinc helps prevent and correct zinc deficiency symptoms such as yellowing between leaf veins, small leaves, shortened internodes, and reduced yield.
In summary, chelated zinc is a stabilized and plant-available form of zinc that ensures more efficient nutrient uptake and better plant health compared to non-chelated zinc sources.
