Alpha Napthyl Acetic Acid 4.5% Sl Herbicide is an organic compound used as a plant growth regulator and herbicide. It is commonly used in the form of a 4.5% solution, which is applied to the soil to control and promote plant growth. It works by inhibiting the growth, while promoting the growth of desirable plants. It is most effective when applied to young, actively growing . This Alpha Napthyl Acetic Acid 4.5% Sl Herbicide is generally considered to be safe to use around humans and animals, but should be used with caution as it can be harmful if ingested or inhaled.