HSN Code 3101 refers to "Animal or vegetable fertilisers, whether or not mixed together or chemically treated; fertilisers produced by the mixing or chemical treatment of animal or vegetable products (excluding those in pellet or similar forms, or in packages with a gross weight of = 10 kg)." This classification code is essential for identifying fertilisers for import/export purposes based on their nature, composition, and intended use. Common products under HSN Code 3101 include organic fertilisers, compost, manure, and liquid fertilisers. Additionally, the GST rate for animal and vegetable fertilisers under this code ensures accurate trade compliance.