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Section VI - Chapter 31
Fertilizers
Notes
1. This chapter does not cover:
(a). Animal blood of heading 0511;
(b). Separate chemically defined compounds (other than those answering to the descriptions in notes 2(a), 3(a), 4(a), or 5 below); or
(c). Cultured potassium chloride crystals (other than optical elements) weighing not less than 2.5 g each, of heading 3824; optical elements of potassium chloride, of heading 9001.
2. Heading 3102 applies only to the following goods, provided that they are not put up in the forms or packages described in heading 3105:
(a). Goods which answer to one or other of the descriptions given below:
(i). Sodium nitrate, whether or not pure;
(ii). Ammonium nitrate, whether or not pure;
(iii). Double salts, whether or not pure, of ammonium sulfate and ammonium nitrate;
(iv). Ammonium sulfate, whether or not pure;
(v). Double salts (whether or not pure) or mixtures of calcium nitrate and ammonium nitrate;
(vi). Double salts (whether or not pure) or mixtures of calcium nitrate and magnesium nitrate;
(vii). Calcium cyanamide, whether or not pure or treated with oil;
(viii). Urea, whether or not pure.
(b). Fertilizers consisting of any of the goods described in 2(a) above mixed together.
(c). Fertilizers consisting of ammonium chloride or of any of the goods described in 2(a) or 2(b) above mixed with chalk, gypsum or other inorganic nonfertilizing substances.
(d). Liquid fertilizers consisting of the goods of subparagraph 2(a) (iii) or 2(a) (viii) or of mixtures of those goods, in an aqueous or ammoniacal solution.
3. Heading 3103 applies only to the following goods, provided that they are not put up in the forms or packages described in heading 3105:
(a). Goods which answer to one or other of the descriptions given below:
(i). Basic slag;
(ii). Natural phosphates of heading 2510, calcined or further heat-treated than for the removal of impurities;
(iii). Superphosphates (single, double or triple);
(iv). Calcium hydrogenorthophosphate containing not less than 0.2 percent by weight of fluorine calculated on the dry anhydrous product.
(b). Fertilizers consisting of any of the goods described in 3(a) above, mixed together, but with no account being taken of the fluorine content limit.
(c). Fertilizers consisting of any of the goods described in 3(a) or 3(b) above, but with no account being taken of the fluorine content limit, mixed with chalk, gypsum or other inorganic nonfertilizing substances.
4. Heading 3104 applies only to the following goods, provided that they are not put up in the forms or packages described in heading 3105:
(a). Goods which answer to one or other of the descriptions given below:
(i). Crude natural potassium salts (for example, carnallite, kainite and sylvite);
(ii). Potassium chloride, whether or not pure, except as provided in note (c) above;
(iii). Potassium sulfate, whether or not pure;
(iv). Magnesium potassium sulfate, whether or not pure.
(b). Fertilizers consisting of any of the goods described in 4(a) above mixed together.
5. Ammonium dihydrogenorthophosphate (monoammonium phosphate) and diammonium hydrogenorthophosphate (diammonium phosphate), whether or not pure, and intermixtures thereof, are to be classified in heading 3105.
6. For the purpose of heading 3105, the term "other fertilizers" applies only to products of a kind used as fertilizers and containing, as an essential constituent, at least one of the fertilizing elements nitrogen, phosphorus or potassium.

Schedule B No. and Headings Commodity Description Unit of Quantity Second Quantity
31 Fertilizers
3101.00.0000 - 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
31.02 - Mineral or chemical fertilizers, nitrogenous:
3102.10.0000 - - Urea, whether or not in aqueous solution t
- - Ammonium sulfate; double salts and mixtures of ammonium sulfate and ammonium nitrate:
3102.21.0000 - - - Ammonium sulfate t
3102.29.0000 - - - Other t
3102.30.0000 - - Ammonium nitrate, whether or not in aqueous solution t
3102.40.0000 - - Mixtures of ammonium nitrate with calcium carbonate or other inorganic nonfertilizing substances t
3102.50.0000 - - Sodium nitrate t
3102.60.0000 - - Double salts and mixtures of calcium nitrate and ammonium nitrate t
3102.80.0000 - - Mixtures of urea and ammonium nitrate in aqueous or ammoniacal solution t
3102.90.0100 - - Other, including mixtures not specified in the foregoing subheadings t
31.03 - Mineral or chemical fertilizers, phosphatic:
3103.10 - - Superphosphates:
3103.10.0010 - - - Normal and enriched superphosphates, less than 40 percent available phosphorus pentoxide (P205) equivalent t
3103.10.0020 - - - Concentrated superphosphates, 40 percent or more available phosphorus pentoxide (P2O5) equivalent t
3103.90.0100 - - Other t
31.04 - Mineral or chemical fertilizers, potassic:
3104.20.0000 - - Potassium chloride t
3104.30.0000 - - Potassium sulfate t
3104.90.0100 - - Other t
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 (22 lbs.):
3105.10.0000 - - Products of this chapter in tablets or similar forms or in packages of a gross weight not exceeding 10 kg (22 lbs.) kg
3105.20.0000 - - Mineral or chemical fertilizers containing the three fertilizing elements nitrogen, phosphorus and potassium t
3105.30.0000 - - Diammonium hydrogenorthophosphate (diammonium phosphate) t
3105.40.0000 - - Ammonium dihydrogenorthophosphate (monoammonium phosphate) and mixtures thereof with diammonium hydrogenorthophosphate (diammonium phosphate) t
- - Other mineral or chemical fertilizers containing the two fertilizing elements nitrogen and phosphorus:
3105.51.0000 - - - Containing nitrates and phosphates t
3105.59.0000 - - - Other t
3105.60.0000 - - Mineral or chemical fertilizers containing the two fertilizing elements phosphorus and potassium t
3105.90.0000 - - Other t

Source: U.S. Census Bureau | Foreign Trade | ftdwebm 7;ster@census.gov |  Last Revised: April 22, 2014