Which statement about coating efficiency is true?

• A. The proportion of active ingredient that ends up on seeds relative to the amount added.
• B. It measures application speed.
• C. It is unrelated to seed protection efficacy.
• D. It determines the seed color.

Answer: (A)

Coating efficiency is the fraction of the added active ingredient that actually ends up on the seed during treatment. It’s the proportion of the active ingredient that sticks to or remains with the seed divided by the amount you started with. This matters because it directly affects how much protection the seed receives, as well as cost and environmental impact—high efficiency means more of the protective dose stays with the seed instead of being wasted in the coating process. The statement that describes this proportion precisely is the best answer. The other ideas miss the core idea: coating efficiency isn’t about how fast you apply the coating, and protection depends on the dose delivered to the seed, not the seed’s color.