31 Fertilizers
| Heading | Description | General |
|---|---|---|
| 3101 | Animal or vegetable fertilizers, whether or not mixed together or chemically treated; fertilizers produced by the mixing or chemical treatment of animal or vegetable products | Free |
| 3102 | Mineral or chemical fertilizers, nitrogenous | — |
| 3103 | Mineral or chemical fertilizers, phosphatic | — |
| 3104 | Mineral or chemical fertilizers, potassic | — |
| 3105 | Mineral or chemical fertilizers containing two or three of the fertilizing elements nitrogen, phosphorus and potassium; other fertilizers; goods of this chapter in tablets or similar forms or in packages of a gross weight not exceeding 10 kg | — |
Source: USITC HTS (2026 Basic Edition, frozen to the exam). Rates shown at heading level; duty rates are set on 8/10-digit subheadings. Not legal or classification advice.