# United States tariff, chapter 31: Fertilisers > The United States tariff has 29 national lines in HS chapter 31 (fertilisers), under 24 subheadings in 5 headings. Source: https://border.bot/countries/united-states/hs-codes/31 Last updated: 9 October 2026 [Countries](https://border.bot/countries) / [United States](https://border.bot/countries/united-states) / [Chapter 31](https://border.bot/countries/united-states/hs-codes/31) ## Key facts - National lines: 29 - Subheadings: 24 - Tariff: [United States](https://border.bot/countries/united-states) - Chapter: 31: Fertilisers ## Subheadings with United States lines The United States tariff has 29 national lines in HS chapter 31 (fertilisers), under 24 subheadings in 5 headings. ### 31.01 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 - [3101.00](https://border.bot/countries/united-states/hs-codes/310100) 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 (1 line) ### 31.02 Mineral or chemical fertilizers, nitrogenous - [3102.10](https://border.bot/countries/united-states/hs-codes/310210) Urea, whether or not in aqueous solution (3 lines) - [3102.21](https://border.bot/countries/united-states/hs-codes/310221) Ammonium sulphate; double salts and mixtures of ammonium sulphate and ammonium nitrate: Ammonium sulphate (1 line) - [3102.29](https://border.bot/countries/united-states/hs-codes/310229) Ammonium sulphate; double salts and mixtures of ammonium sulphate and ammonium nitrate: Other (1 line) - [3102.30](https://border.bot/countries/united-states/hs-codes/310230) Ammonium nitrate, whether or not in aqueous solution (1 line) - [3102.40](https://border.bot/countries/united-states/hs-codes/310240) Mixtures of ammonium nitrate with calcium carbonate or other inorganic non-fertilising substances (1 line) - [3102.50](https://border.bot/countries/united-states/hs-codes/310250) Sodium nitrate (1 line) - [3102.60](https://border.bot/countries/united-states/hs-codes/310260) Double salts and mixtures of calcium nitrate and ammonium nitrate (1 line) - [3102.80](https://border.bot/countries/united-states/hs-codes/310280) Mixtures of urea and ammonium nitrate in aqueous or ammoniacal solution (1 line) - [3102.90](https://border.bot/countries/united-states/hs-codes/310290) Other, including mixtures not specified in the foregoing subheadings (1 line) ### 31.03 Mineral or chemical fertilizers, phosphatic - [3103.11](https://border.bot/countries/united-states/hs-codes/310311) Superphosphates: Containing by weight 35 % or more of diphosphorus pentaoxide (P2O5) (1 line) - [3103.19](https://border.bot/countries/united-states/hs-codes/310319) Superphosphates: Other (1 line) - [3103.90](https://border.bot/countries/united-states/hs-codes/310390) Other (1 line) ### 31.04 Mineral or chemical fertilizers, potassic - [3104.20](https://border.bot/countries/united-states/hs-codes/310420) Potassium chloride (2 lines) - [3104.30](https://border.bot/countries/united-states/hs-codes/310430) Potassium sulphate (1 line) - [3104.90](https://border.bot/countries/united-states/hs-codes/310490) Other (1 line) ### 31.05 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 - [3105.10](https://border.bot/countries/united-states/hs-codes/310510) Goods of this Chapter in tablets or similar forms or in packages of a gross weight not exceeding 10kg (1 line) - [3105.20](https://border.bot/countries/united-states/hs-codes/310520) Mineral or chemical fertilisers containing the three fertilising elements nitrogen, phosphorus and potassium (1 line) - [3105.30](https://border.bot/countries/united-states/hs-codes/310530) Diammonium hydrogenorthophosphate (diammonium phosphate) (1 line) - [3105.40](https://border.bot/countries/united-states/hs-codes/310540) Ammonium dihydrogenorthophosphate (monoammonium phosphate) and mixtures thereof with diammonium hydrogenorthophosphate (diammonium phosphate) (2 lines) - [3105.51](https://border.bot/countries/united-states/hs-codes/310551) Other mineral or chemical fertilisers containing the two fertilising elements nitrogen and phosphorus: Containing nitrates and phosphates (1 line) - [3105.59](https://border.bot/countries/united-states/hs-codes/310559) Other mineral or chemical fertilisers containing the two fertilising elements nitrogen and phosphorus: Other (1 line) - [3105.60](https://border.bot/countries/united-states/hs-codes/310560) Mineral or chemical fertilisers containing the two fertilising elements phosphorus and potassium (1 line) - [3105.90](https://border.bot/countries/united-states/hs-codes/310590) Other (2 lines) ## In other countries No other national tariff on border.bot has live lines under chapter 31 yet. - [The Harmonized System text for chapter 31](https://border.bot/hs-codes/31) - Previous chapter: [30](https://border.bot/countries/united-states/hs-codes/30) Pharmaceutical goods specified in note 4 to this chapter - Next chapter: [32](https://border.bot/countries/united-states/hs-codes/32) Tanning extracts of vegetable origin; tannins and their salts, ethers, esters and other derivatives ## Frequently asked questions ### How many national tariff lines does the United States tariff have in HS chapter 31? The United States tariff has 29 national lines in HS chapter 31 (fertilisers), under 24 subheadings in 5 headings. ## Sources and updates The tariff lines for the United States come from border.bot release 1 (edition 2026HTSRev21), read from the publisher’s files, and have been live since 9 October 2026. The duty rates for the United States come from border.bot release 1 (edition 2026HTSRev21), read from the publisher’s files, and have been live since 9 October 2026. The trade programmes for the United States come from border.bot release 1 (edition 2026HTSRev21), read from the publisher’s files, and have been live since 9 October 2026. This page was last updated on 9 October 2026. Guidance from published tariff data, not a binding ruling. For a decision customs must follow, apply to the destination’s customs authority for a binding tariff ruling. Official source files: - https://hts.usitc.gov/reststop/exportList?from=0000000000&to=9999999999&format=CSV&styles=false Machine-readable: https://border.bot/countries/united-states/hs-codes/31.json