From Chapter 31: Chapter 31
| HTS Code | Description | General Duty |
|---|---|---|
| 3102100000 | Mineral or chemical fertilizers, nitrogenous Urea, whether or not in aqueous solution | Free |
| 3102100010 | Urea, whether or not in aqueous solution Solid urea | Free |
| 3102100030 | Other Diesel exhaust fluid (DEF) of a kind meeting ISO 22241 | Free |
| 3102100050 | Other Other | Free |
| 3102210000 | Ammonium sulfate; double salts and mixtures of ammonium sulfate and ammonium nitrate Ammonium sulfate | Free |
| 3102290000 | Ammonium sulfate; double salts and mixtures of ammonium sulfate and ammonium nitrate Other | Free |
| 3102300000 | Mineral or chemical fertilizers, nitrogenous Ammonium nitrate, whether or not in aqueous solution | Free |
| 3102400000 | Mineral or chemical fertilizers, nitrogenous Mixtures of ammonium nitrate with calcium carbonate or other inorganic nonfertilizing substances | Free |
| 3102500000 | Mineral or chemical fertilizers, nitrogenous Sodium nitrate | Free |
| 3102600000 | Mineral or chemical fertilizers, nitrogenous Double salts and mixtures of calcium nitrate and ammonium nitrate | Free |
| 3102800000 | Mineral or chemical fertilizers, nitrogenous Mixtures of urea and ammonium nitrate in aqueous or ammoniacal solution | Free |
| 3102900100 | Mineral or chemical fertilizers, nitrogenous Other, including mixtures not specified in the foregoing subheadings | Free |