Chapter 31
Fertilizers
By TariffCenter Research Team · Updated 2026-04-09 · Source: USITC Harmonized Tariff Schedule
At a glance
Chapter 31 contains 37 HTS lines covering fertilizers. General U.S. duty rates: Free. Section 301 surcharges apply on selected lines for imports from China. Reciprocal tariffs apply following the February 2026 SCOTUS ruling.
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
#Heading 3101 contains 1 HTS line. General U.S. duty rates: Free. Section 301 surcharges (7.5%–100%) and Section 122 surcharge (15%) apply to selected lines.
| HS Code | Description | General Rate | Special Rates |
|---|---|---|---|
| 3101.00.00.00 | 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 | 301: 25%S122: 10% |
3102 — Mineral or chemical fertilizers, nitrogenous
#Heading 3102 contains 13 HTS lines. General U.S. duty rates: Free. Section 301 surcharges (7.5%–100%) and Section 122 surcharge (15%) apply to selected lines.
3102
Mineral or chemical fertilizers, nitrogenous:
Free
3102.10.00
Urea, whether or not in aqueous solution
Free
3102.10.00.10
Solid urea
Free
3102.10.00.30
Diesel exhaust fluid (DEF) of a kind meeting ISO 22241
Free
3102.10.00.50
Other
Free
3102.21.00.00
Ammonium sulfate
Free
3102.29.00.00
Other
Free
3102.30.00.00
Ammonium nitrate, whether or not in aqueous solution
Free
3102.40.00.00
Mixtures of ammonium nitrate with calcium carbonate or other inorganic nonfertilizing substances
Free
3102.50.00.00
Sodium nitrate
Free
3102.60.00.00
Double salts and mixtures of calcium nitrate and ammonium nitrate
Free
3102.80.00.00
Mixtures of urea and ammonium nitrate in aqueous or ammoniacal solution
Free
3102.90.01.00
Other, including mixtures not specified in the foregoing subheadings
Free
| HS Code | Description | General Rate | Special Rates |
|---|---|---|---|
| 3102 | Mineral or chemical fertilizers, nitrogenous: | Free | 301: 25%S122: 10% |
| 3102.10.00 | Urea, whether or not in aqueous solution | Free | 301: 25%S122: 10% |
| 3102.10.00.10 | Solid urea | Free | 301: 25%S122: 10% |
| 3102.10.00.30 | Diesel exhaust fluid (DEF) of a kind meeting ISO 22241 | Free | 301: 25%S122: 10% |
| 3102.10.00.50 | Other | Free | 301: 25%S122: 10% |
| 3102.21.00.00 | Ammonium sulfate | Free | 301: 25%S122: 10% |
| 3102.29.00.00 | Other | Free | 301: 25%S122: 10% |
| 3102.30.00.00 | Ammonium nitrate, whether or not in aqueous solution | Free | 301: 25%S122: 10% |
| 3102.40.00.00 | Mixtures of ammonium nitrate with calcium carbonate or other inorganic nonfertilizing substances | Free | 301: 25%S122: 10% |
| 3102.50.00.00 | Sodium nitrate | Free | 301: 25%S122: 10% |
| 3102.60.00.00 | Double salts and mixtures of calcium nitrate and ammonium nitrate | Free | 301: 25%S122: 10% |
| 3102.80.00.00 | Mixtures of urea and ammonium nitrate in aqueous or ammoniacal solution | Free | 301: 25%S122: 10% |
| 3102.90.01.00 | Other, including mixtures not specified in the foregoing subheadings | Free | 301: 25%S122: 10% |
3103 — Mineral or chemical fertilizers, phosphatic
#Heading 3103 contains 4 HTS lines. General U.S. duty rates: Free. Section 301 surcharges (7.5%–100%) and Section 122 surcharge (15%) apply to selected lines.
3103
Mineral or chemical fertilizers, phosphatic:
Free
3103.11.00.00
Containing by weight 35 percent or more of diphosphorous pentaoxide (P2O5)
Free
3103.19.00.00
Other
Free
3103.90.01.00
Other
Free
| HS Code | Description | General Rate | Special Rates |
|---|---|---|---|
| 3103 | Mineral or chemical fertilizers, phosphatic: | Free | 301: 25%S122: 10% |
| 3103.11.00.00 | Containing by weight 35 percent or more of diphosphorous pentaoxide (P2O5) | Free | 301: 25%S122: 10% |
| 3103.19.00.00 | Other | Free | 301: 25%S122: 10% |
| 3103.90.01.00 | Other | Free | 301: 25%S122: 10% |
3104 — Mineral or chemical fertilizers, potassic
#Heading 3104 contains 6 HTS lines. General U.S. duty rates: Free. Section 301 surcharges (7.5%–100%) and Section 122 surcharge (15%) apply to selected lines.
3104
Mineral or chemical fertilizers, potassic:
Free
3104.20.00
Potassium chloride
Free
3104.20.00.10
Containing not more than 62 percent by weight of potassium oxide (K2O)
Free
3104.20.00.50
Containing more than 62 percent by weight of potassium oxide (K2O)
Free
3104.30.00.00
Potassium sulfate
Free
3104.90.01.00
Other
Free
| HS Code | Description | General Rate | Special Rates |
|---|---|---|---|
| 3104 | Mineral or chemical fertilizers, potassic: | Free | 301: 25%S122: 10% |
| 3104.20.00 | Potassium chloride | Free | 301: 25%S122: 10% |
| 3104.20.00.10 | Containing not more than 62 percent by weight of potassium oxide (K2O) | Free | 301: 25%S122: 10% |
| 3104.20.00.50 | Containing more than 62 percent by weight of potassium oxide (K2O) | Free | 301: 25%S122: 10% |
| 3104.30.00.00 | Potassium sulfate | Free | 301: 25%S122: 10% |
| 3104.90.01.00 | Other | Free | 301: 25%S122: 10% |
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
#Heading 3105 contains 13 HTS lines. General U.S. duty rates: Free. Section 301 surcharges (7.5%–100%) and Section 122 surcharge (15%) apply to selected lines.
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:
Free
3105.10.00.00
Products of this chapter in tablets or similar forms or in packages of a gross weight not exceeding 10 kg
Free
3105.20.00.00
Mineral or chemical fertilizers containing the three fertilizing elements nitrogen, phosphorus and potassium
Free
3105.30.00.00
Diammonium hydrogenorthophosphate (Diammonium phosphate)
Free
3105.40.00
Ammonium dihydrogenorthophosphate (Monoammonium phosphate) and mixtures thereof with diammonium hydrogenorthophosphate (Diammonium phosphate)
Free
3105.40.00.10
Ammonium dihydrogenorthophosphate (Monoammonium phosphate)
Free
3105.40.00.50
Other
Free
3105.51.00.00
Containing nitrates and phosphates
Free
3105.59.00.00
Other
Free
3105.60.00.00
Mineral or chemical fertilizers containing the two fertilizing elements phosphorus and potassium
Free
3105.90.00
Other
Free
3105.90.00.10
Potassium nitrate-sodium nitrate mixtures
Free
3105.90.00.50
Other
Free
| HS Code | Description | General Rate | Special Rates |
|---|---|---|---|
| 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: | Free | 301: 25%S122: 10% |
| 3105.10.00.00 | Products of this chapter in tablets or similar forms or in packages of a gross weight not exceeding 10 kg | Free | 301: 25%S122: 10% |
| 3105.20.00.00 | Mineral or chemical fertilizers containing the three fertilizing elements nitrogen, phosphorus and potassium | Free | 301: 25%S122: 10% |
| 3105.30.00.00 | Diammonium hydrogenorthophosphate (Diammonium phosphate) | Free | 301: 25%S122: 10% |
| 3105.40.00 | Ammonium dihydrogenorthophosphate (Monoammonium phosphate) and mixtures thereof with diammonium hydrogenorthophosphate (Diammonium phosphate) | Free | 301: 25%S122: 10% |
| 3105.40.00.10 | Ammonium dihydrogenorthophosphate (Monoammonium phosphate) | Free | 301: 25%S122: 10% |
| 3105.40.00.50 | Other | Free | 301: 25%S122: 10% |
| 3105.51.00.00 | Containing nitrates and phosphates | Free | 301: 25%S122: 10% |
| 3105.59.00.00 | Other | Free | 301: 25%S122: 10% |
| 3105.60.00.00 | Mineral or chemical fertilizers containing the two fertilizing elements phosphorus and potassium | Free | 301: 25%S122: 10% |
| 3105.90.00 | Other | Free | 301: 25%S122: 10% |
| 3105.90.00.10 | Potassium nitrate-sodium nitrate mixtures | Free | 301: 25%S122: 10% |
| 3105.90.00.50 | Other | Free | 301: 25%S122: 10% |
Frequently Asked Questions — Chapter 31
Sources & Methodology
- Base HTS rates: U.S. International Trade Commission — Harmonized Tariff Schedule (2025 edition, Chapter 31). “General rate” shows the min–max range across all 10-digit subheadings.
- Section 301 rates: Office of the U.S. Trade Representative — Section 301 action lists. Flags indicate HTS lines listed on USTR China 301 Lists 1–4B.
- Reciprocal tariffs: Based on the post-SCOTUS Section 122 framework (February 2026). See the TariffCenter Tariff Tracker for current program status.
- Verify before importing: U.S. Customs and Border Protection — Rulings Online or consult a licensed customs broker for binding classification rulings.
Glossary
- General rate (MFN rate)
- The base import duty applied to all World Trade Organization members under Most-Favored-Nation treatment. This is the standard rate shown in the General Rate column.
- Section 301 tariff (301: 7.5%–100%)
- An additional surcharge authorized under Section 301 of the Trade Act of 1974, imposed on selected imports from China. Rates vary by product list and category: Lists 1–3 at 25%, List 4A at 7.5%, with four-year review increases up to 100% on strategic sectors (EVs, semiconductors, solar, medical equipment). Applied on top of the MFN base rate.
- Section 122 surcharge (Sec. 122: 15%)
- A 15% global surcharge on all imports enacted under Section 122 authority after the February 2026 SCOTUS ruling struck down IEEPA-based reciprocal tariffs. USMCA-qualifying goods are exempt. Stacked on top of base and Section 301 rates.
- Section 232 tariff (S232)
- Tariffs on qualifying steel, aluminum, copper, and derivative products imposed under Section 232 of the Trade Expansion Act of 1962 on national security grounds. Rates now vary by product bucket and current Chapter 99 treatment.
- hts_special / Special rates
- Preferential duty rates available to imports from countries with Free Trade Agreements or other special trade programs with the U.S. Country codes: AU (Australia), BH (Bahrain), CA (Canada), CL (Chile), CO (Colombia), IL (Israel), JO (Jordan), KR (South Korea), MA (Morocco), MX (Mexico), OM (Oman), PA (Panama), PE (Peru), SG (Singapore). Free (AU,BH...) means duty-free treatment for those partners.