What is the purpose of adhesives and carriers in seed coatings?

• A. To improve shelf life.
• B. To color seeds for identification.
• C. To increase seed size.
• D. To help the active ingredient adhere to the seed and to control release and coverage.

Answer: (D)

In seed coatings, adhesives and carriers are used to make sure the active ingredient stays attached to the seed and is released in a controlled way for even coverage. The adhesive acts like a glue that helps the coating stick to the seed surface as it goes through handling, drying, and planting, so the treatment doesn’t rub off. The carrier is the material that carries the active ingredient and helps create a uniform coating, affects how the ingredient is released after planting, and can protect the active ingredient from moisture or abrasion until germination begins. This combination ensures consistent dose, better protection from dust, and predictable performance in the field. While overall formulation choices can influence shelf life, the main role of adhesives and carriers is adhesion, coverage, and controlled release.