Chelated micronutrients

A chelated micronutrient product combines a specific metal, such as iron, zinc, manganese, or copper, with a chelating agent that varies in structure and pH stability. Guaranteed analysis is expressed as the percentage of the metal element, and formulations vary by both element and chelating agent used.

Chelated products supply specific micronutrients, most commonly iron, zinc, manganese, or copper, in a form that resists conversion to insoluble compounds in soil, keeping the element available for root uptake for longer than an equivalent uncomplexed mineral salt would remain.

• Delivers a targeted micronutrient rather than a broad nutrient package
• Chelation improves availability particularly on alkaline or calcareous soils
• Different chelating agents suit different elements and soil pH conditions

Chelated micronutrients are used to correct or prevent specific micronutrient deficiencies, such as iron chlorosis in soybean or citrus on high-pH soils, where uncomplexed mineral salts would rapidly become unavailable in the soil.

• Effective for correcting deficiencies of specific elements identified by soil or tissue testing
• Useful where soil conditions, especially high pH, limit availability of uncomplexed mineral micronutrient sources
• Applicable as soil, foliar, or fertigation treatments, depending on the product

General practice is to confirm a specific micronutrient deficiency through soil or tissue testing before applying a chelated product, and to select the chelating agent suited to the target element and soil pH, since not every chelate performs equally across all soil conditions.

Because chelated micronutrients are typically applied in small quantities targeted at a specific deficiency, their environmental footprint differs from that of bulk macronutrient fertilizers; the main considerations are avoiding unnecessary over-application and following label guidance for the specific chelate and crop.