PlainTariff

HTS Chapter 31 · Section VI

Fertilisers

US import duty rates and HTS classifications for every product in Chapter 31, part of Section VI.

Browse all chapters →
24
rated tariff lines
100%
enter duty-free

Tariff lines in Chapter 31 by duty-rate band

How the 24 rated lines in this chapter distribute across general (MFN) rate ranges

Duty-free24

Source: USITC HTS 2026 As of 2026

About HTS Chapter 31

HTS Chapter 31 - Fertilisers - organizes 41 tariff classifications in the US Harmonized Tariff Schedule. Of these, 24 carry explicit duty rates at the tariff-line level, meaning importers can look up a specific Column 1 General (MFN) rate for every qualifying shipment. Chapter 31 sits within Section VI (Products of the Chemical or Allied Industries), which groups commercially related product categories together.

The average general duty rate across all tariff lines in this chapter is not available, with the highest individual rate reaching not available. Duty burden varies widely across tariff lines within this chapter, classification precision matters. Below, each line links to its individual detail page showing General, Special (FTA), and Column 2 rates.

Use this chapter page as the entry point for classifying any product that falls under fertilisers. The tree below preserves the HTS indentation hierarchy (heading → subheading → tariff line), so you can narrow from broad category to specific 8-10 digit code. All data comes from the US International Trade Commission (USITC) HTS 2026 Basic Edition, the official schedule of import duties used by US Customs and Border Protection.

Chapter 31 At a Glance

Tariff distribution statistics for HTS Chapter 31 from USITC 2026 Basic Edition.
Metric Value Notes
Total tariff classifications 41 All headings, subheadings, and tariff lines.
Lines with explicit rates 24 Tariff lines carrying a Column 1 General duty.
Average general rate n/a Mean MFN rate across rated lines.
Highest line rate n/a Peak Column 1 General rate within the chapter.

Source: USITC Harmonized Tariff Schedule 2026 Basic Edition. Computed at last data refresh, see methodology.

Tariff Lines

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
t
Free
3102 Mineral or chemical fertilizers, nitrogenous:
3102.10.00 Urea, whether or not in aqueous solution
Free
3102.10.00.10 Solid urea
t
Other:
3102.10.00.30 Diesel exhaust fluid (DEF) of a kind meeting ISO 22241
t
3102.10.00.50 Other
t
Ammonium sulfate; double salts and mixtures of ammonium sulfate and ammonium nitrate:
3102.21.00.00 Ammonium sulfate
t
Free
3102.29.00.00 Other
t
Free
3102.30.00.00 Ammonium nitrate, whether or not in aqueous solution
t
Free
3102.40.00.00 Mixtures of ammonium nitrate with calcium carbonate or other inorganic nonfertilizing substances
t
Free
3102.50.00.00 Sodium nitrate
t
Free
3102.60.00.00 Double salts and mixtures of calcium nitrate and ammonium nitrate
t
Free
3102.80.00.00 Mixtures of urea and ammonium nitrate in aqueous or ammoniacal solution
t
Free
3102.90.01.00 Other, including mixtures not specified in the foregoing subheadings
t
Free
3103 Mineral or chemical fertilizers, phosphatic:
Superphosphates:
3103.11.00.00 Containing by weight 35 percent or more of diphosphorous pentaoxide (P2O5)
t
Free
3103.19.00.00 Other
t
Free
3103.90.01.00 Other
t
Free
3104 Mineral or chemical fertilizers, potassic:
3104.20.00 Potassium chloride
Free
3104.20.00.10 Containing not more than 62 percent by weight of potassium oxide (K2O)
t
3104.20.00.50 Containing more than 62 percent by weight of potassium oxide (K2O)
t
3104.30.00.00 Potassium sulfate
t
Free
3104.90.01.00 Other
t
Free
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:
3105.10.00.00 Products of this chapter in tablets or similar forms or in packages of a gross weight not exceeding 10 kg
kg
Free
3105.20.00.00 Mineral or chemical fertilizers containing the three fertilizing elements nitrogen, phosphorus and potassium
t
Free
3105.30.00.00 Diammonium hydrogenorthophosphate (Diammonium phosphate)
t
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)
t
3105.40.00.50 Other
t
Other mineral or chemical fertilizers containing the two fertilizing elements nitrogen and phosphorus:
3105.51.00.00 Containing nitrates and phosphates
t
Free
3105.59.00.00 Other
t
Free
3105.60.00.00 Mineral or chemical fertilizers containing the two fertilizing elements phosphorus and potassium
t
Free
3105.90.00 Other
Free
3105.90.00.10 Potassium nitrate-sodium nitrate mixtures
t
3105.90.00.50 Other
t

Frequently Asked Questions

What does HTS Chapter 31 cover? ▼
HTS Chapter 31 covers Fertilisers. It contains 41 individual tariff classifications, of which 24 have specified duty rates. This chapter falls under Section VI (Products of the Chemical or Allied Industries).
What is the average tariff rate for Chapter 31? ▼
The average general (MFN) duty rate across all tariff lines in Chapter 31 is not available. The highest individual rate in this chapter is not available. Actual duty on a specific product depends on its precise HTS classification.
How do I find the correct HTS code for my product? ▼
Browse the tariff lines listed below organized by heading and subheading. Each item with an HTS number links to its full detail page showing general, special, and Column 2 duty rates. For complex classifications, consult a licensed customs broker or contact US Customs and Border Protection (CBP).
Are there any duty-free items in Chapter 31? ▼
Yes, many chapters contain items with a "Free" general rate, meaning no duty is assessed for imports from most-favored-nation countries. Look for items marked "Free" in the tariff lines table below. Additional preferential rates may also apply under free trade agreements.
Where does PlainTariff get its tariff data? ▼
All tariff data comes from the U.S. International Trade Commission (USITC) Harmonized Tariff Schedule (HTS) 2026 Basic Edition, the official schedule of US import duties.

Learn More About Tariffs

📖

How Tariffs Work

A plain-language guide to US import duties

 🔍

Reading HTS Codes

How to decode the Harmonized Tariff Schedule

 📊

Most Tariffed Products

Which US imports carry the highest duties

 💰

Tariffs & Consumer Prices

How import duties affect what you pay

Next steps

Find the exact rate for your product within Chapter 31.

The chapter average is an orientation only, duty is set per tariff line, and Special preferential rates may apply to qualifying origins.

Related

Browse all → | Rankings →

Sources: U.S. International Trade Commission Harmonized Tariff Schedule (2026 Basic Edition) and FAO FAOSTAT Trade: Crops and Livestock. See our methodology for how figures are computed.

Every figure on PlainTariff is rendered directly from federal source data, no number is typed in by an editor. This page draws directly on federal source data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.