Introduction

Humic acid is a natural organic substance that is derived from the decomposition of plant and animal matter. It is commonly found in soil and is known to have numerous benefits for plant growth and development. One of its important functions is enhancing the absorption of iron by plant roots.

Chelation of Iron

Humic acid has the ability to chelate iron ions in the soil. Chelation refers to the process of forming a complex between a metal ion, in this case, iron, and an organic molecule, such as humic acid. This complex formation prevents the iron from being immobilized or unavailable for uptake by plant roots.

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Increased Solubility

Iron is often present in the soil in insoluble forms, making it difficult for plant roots to absorb. Humic acid can increase the solubility of iron by forming soluble complexes with it. These complexes are more easily taken up by plant roots, ensuring a sufficient supply of iron for plant growth.

Stimulation of Root Exudates

Humic acid has been found to stimulate the secretion of root exudates, which are organic compounds released by plant roots. These exudates can enhance the mobilization and uptake of iron by forming soluble complexes with it. Additionally, they can also promote the growth of beneficial microorganisms in the rhizosphere, further aiding in the availability of iron to plants.

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Improvement of Soil Structure

Humic acid can improve soil structure by promoting the formation of stable aggregates. This leads to better aeration and water infiltration in the soil, which in turn enhances the availability and movement of iron towards plant roots. The improved soil structure also provides a favorable environment for root growth and development.

Conclusion

Humic acid plays a crucial role in enhancing the absorption of iron by plant roots. Through chelation, increased solubility, stimulation of root exudates, and improvement of soil structure, humic acid ensures that plants have access to an adequate supply of iron for their growth and development.

Keywords: growth, exudates, structure, organic, development, chelation, forming, solubility, complexes