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Commission Regulation (EU) No 1257/2014 of 24 November 2014 amending Regulation (EC) No 2003/2003 of the European Parliament and of the Council relating to fertilisers for the purposes of adapting Annexes I and IV Text with EEA relevance


Published: 2014-11-24

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25.11.2014   

EN

Official Journal of the European Union

L 337/53


COMMISSION REGULATION (EU) No 1257/2014

of 24 November 2014

amending Regulation (EC) No 2003/2003 of the European Parliament and of the Council relating to fertilisers for the purposes of adapting Annexes I and IV

(Text with EEA relevance)

THE EUROPEAN COMMISSION,

Having regard to the Treaty on the Functioning of the European Union,

Having regard to Regulation (EC) No 2003/2003 of the European Parliament and of the Council of 13 October 2003 relating to fertilisers (1), and in particular Article 31(1) and (3) thereof,

Whereas:

(1)

Crude potassium salts are materials obtained from natural resources through mining. For such natural products, the minimum nutrient content requirements set out in entry 1 of Table A.3 of Annex I to Regulation (EC) No 2003/2003 were laid down in accordance with sound industrial practice. However, when the potassium grade in the ore is naturally declining, producers encounter increasing difficulties to comply with the current limits, which jeopardies the continuous supply of fertilisers obtained from crude potassium salts to professional farmers. Therefore, these limits should be slightly reduced by amending entry 1 of Table A.3 of that Annex to allow producers to continue marketing their product as ‘EC fertiliser’. This amendment takes into account that the revised, slightly lower limit values also allow for efficient fertilisation and can therefore be considered as technical progress in accordance with Article 31(3) of Regulation (EC) No 2003/2003.

(2)

3,4–dimethyl-1H-pyrazole phosphate (hereinafter ‘DMPP’) is a nitrification inhibitor that is suitable for use with common nitrogen fertilisers (solid or fluid). DMPP reduces the risks of nitrogen losses into the soil and in the atmosphere and therefore enhances nitrogen use efficiency.

(3)

The reaction mixture between N-butyl-thiophosphoric-triamide and N-propyl-thiophosphoric-triamide (hereinafter ‘NBPT/NPPT’) is a urease inhibitor. NBPT/NPPT reduces the risk of nitrogen losses in the form of ammonia emissions after the application of urea-containing fertilisers and therefore enhances the nitrogen use efficiency.

(4)

In order to make them more widely available to farmers throughout the Union, DMPP and NBPT/NPPT should be added to the lists of authorised nitrification and urease inhibitors in Annex I to Regulation (EC) No 2003/2003 in accordance with Article 31(1) of Regulation (EC) No 2003/2003.

(5)

Solid or fluid straight urea formaldehyde fertilisers as well as solid NPK, NP and NK fertilisers containing urea formaldehyde are listed as fertiliser types in Annex I to Regulation (EC) No 2003/2003. Although urea formaldehyde condensates are stable in solution and in suspension, fluid NPK, NP and NK fertilisers containing urea formaldehyde are not yet listed in Annex I to Regulation (EC) No 2003/2003 as an individual product type. As there is a growing interest in marketing fluid NPK, NP and NK fertilisers containing a certain amount of urea formaldehyde as source of nitrogen, urea formaldehyde should be allowed in the preparation of fluid NPK, NP and NK fertilisers. Six new type designations should therefore be included in Table C.2 of Annex I to that Regulation.

(6)

Further to the inclusion of DMPP and NBPT/NPPT in Annex I to Regulation (EC) No 2003/2003, analytical methods to be applied for the official control of those fertilisers should be added to Annex IV to that Regulation.

(7)

Regulation (EC) No 2003/2003 should therefore be amended accordingly.

(8)

In order to ensure that the method for the analysis of NBPT/NPPT, which is currently under validation, is published by the European Committee for Standardisation before the addition of NBPT/NPPT in Annex I to Regulation (EC) No 2003/2003 and the new analytical method for that fertiliser type in its Annex IV, the application should be deferred as regards those amendments.

(9)

The measures provided for in this Regulation are in accordance with the opinion of the Committee established by Article 32 of Regulation (EC) No 2003/2003,

HAS ADOPTED THIS REGULATION:

Article 1

Amendments

Regulation (EC) No 2003/2003 is amended as follows:

(1)

Annex I is amended in accordance with Annex I to this Regulation;

(2)

Annex IV is amended in accordance with Annex II to this Regulation.

Article 2

Entry into force

This Regulation shall enter into force on the twentieth day following that of its publication in the Official Journal of the European Union.

Annex I, point (4), and Annex II, point (2), shall apply from 1 January 2016.

This Regulation shall be binding in its entirety and directly applicable in all Member States.

Done at Brussels, 24 November 2014.

For the Commission

The President

Jean-Claude JUNCKER


(1)  OJ L 304, 21.11.2003, p. 1.


ANNEX I

Annex I to Regulation (EC) No 2003/2003 is amended as follows:

(1)

in Table A.3, entry 1 in the table is replaced by the following:

‘1

Crude potassium salt

Product obtained from crude potassium salts

9 % K2O

Potassium expressed as water-soluble K2O

2 % MgO

Magnesium in the form of water-soluble salts, expressed as magnesium oxide

Usual trade names may be added

Water-soluble potassium oxide

Water-soluble magnesium oxide

Total sodium oxide

Chloride content must be declared’

(2)

Table C.2 is amended as follows:

(a)

entries C.2.2 to C.2.8 are replaced by the following:

‘C.2.2

Type designation:

NPK-fertiliser solution containing urea formaldehyde

Data on method of production:

Product obtained chemically and by dissolution in water, in a form stable at atmospheric pressure, without addition of organic nutrients of animal or vegetable origin and containing urea formaldehyde

Minimum content of nutrients (percentage by weight) and other requirements:

Total 15 % (N +P2O5 +K2O)

For each of the nutrients:

5 % N, at least 25 % of the declared content of total nitrogen must derive from nitrogen form (5)

3 % P2O5

3 % K2O

Maximum biuret content: (ureic N + urea formaldehyde N) × 0,026

Forms, solubilities and nutrient content to be declared as specified in columns 4, 5 and 6 — Particle size

Data for identification of the fertilisers — Other requirements

N

P2O5

K2O

N

P2O5

K2O

1

2

3

4

5

6

(1)

Total nitrogen

(2)

Nitric nitrogen

(3)

Ammoniacal nitrogen

(4)

Ureic nitrogen

(5)

Nitrogen from urea formaldehyde

Water-soluble P2O5

Water-soluble K2O

(1)

Total nitrogen

(2)

If any of the forms of nitrogen (2), (3) and (4) amounts to not less than 1 % by weight, it must be declared

(3)

Nitrogen from urea formaldehyde

(4)

If the biuret content is less than 0,2 %, the words “low in biuret” may be added

Water-soluble P2O5

(1)

Water-soluble potassium oxide

(2)

The words “low in chloride” may be used only where the Cl content does not exceed 2 %

(3)

The chloride content may be declared


C.2.3

Type designation:

NPK-fertiliser suspension

Data on method of production:

Product in liquid form, in which the nutrients are derived from substances both in suspension in the water and in solution without addition of organic nutrients of animal or vegetable origin

Minimum content of nutrients (percentage by weight) and other requirements:

Total: 20 %, (N + P2O5 + K2O)

For each of the nutrients: 3 % N, 4 % P2O5, 4 % K2O

Maximum biuret content: ureic N × 0,026

Forms, solubilities and nutrient content to be declared as specified in columns 4, 5 and 6 — Particle size

Data for identification of the fertilisers — Other requirements

N

P2O5

K2O

N

P2O5

K2O

1

2

3

4

5

6

(1)

Total nitrogen

(2)

Nitric nitrogen

(3)

Ammoniacal nitrogen

(4)

Ureic nitrogen

(1)

Water-soluble P2O5

(2)

P2O5 soluble in neutral ammonium citrate

(3)

P2O5 soluble in neutral ammonium citrate and water

Water-soluble K2O

(1)

Total nitrogen

(2)

If any of the forms of nitrogen (2), (3) and (4) amounts to not less than 1 % by weight, it must be declared

(3)

If the biuret content is less than 0,2 %, the words “low in biuret” may be added

The fertilisers must not contain Thomas slag, aluminium calcium phosphate, calcined phosphates, partially solubilised phosphates or rock phosphates

(1)

If the water-soluble P2O5 is less than 2 %, only solubility 2 shall be declared

(2)

If the water-soluble P2O5 is at least 2 %, solubility 3 and the water-soluble P2O5 content shall be declared

(1)

Water-soluble potassium oxide

(2)

The words “low in chloride” may be used only where the Cl content does not exceed 2 %

(3)

The chloride content may be declared


C.2.4

Type designation:

NPK-fertiliser suspension containing urea formaldehyde

Data on method of production:

Product in liquid form, in which the nutrients are derived from substances both in solution and in suspension in water, without addition of organic nutrients of animal or vegetable origin and containing urea formaldehyde

Minimum content of nutrients (percentage by weight) and other requirements:

Total 20 % (N +P2O5 +K2O)

For each of the nutrients:

5 % N, at least 25 % of the declared content of total nitrogen must derive from nitrogen form (5)

At least 3/5 of the declared nitrogen content (5) must be soluble in hot water

4 % P2O5

4 % K2O

Maximum biuret content: (ureic N + urea formaldehyde N) × 0,026

Forms, solubilities and nutrient content to be declared as specified in columns 4, 5 and 6 — Particle size

Data for identification of the fertilisers — Other requirements

N

P2O5

K2O

N

P2O5

K2O

1

2

3

4

5

6

(1)

Total nitrogen

(2)

Nitric nitrogen

(3)

Ammoniacal nitrogen

(4)

Ureic nitrogen

(5)

Nitrogen from urea formaldehyde

(1)

Water-soluble P2O5

(2)

P2O5 soluble in neutral ammonium citrate

(3)

P2O5 soluble in neutral ammonium citrate and in water

Water-soluble K2O

(1)

Total nitrogen

(2)

If any of the forms of nitrogen (2), (3) and (4) amounts to not less than 1 % by weight, it must be declared

(3)

Nitrogen from urea formaldehyde

(4)

If the biuret content is less than 0,2 %, the words “low in biuret” may be added

The fertilisers must not contain Thomas slag, aluminium calcium phosphate, calcined phosphates, partially solubilised phosphates or rock phosphates

(1)

If the water-soluble P2O5 is less than 2 %, only solubility (2) shall be declared

(2)

If the water-soluble P2O5 is at least 2 %, solubility (3) and the water-soluble P2O5 content shall be declared

(1)

Water-soluble potassium oxide

(2)

The words “low in chloride” may be used only where the Cl content does not exceed 2 %

(3)

The chloride content may be declared


C.2.5

Type designation:

NP-fertiliser solution

Data on method of production:

Product obtained chemically and by dissolution in water, in a form stable at atmospheric pressure, without addition of organic nutrients of animal or vegetable origin

Minimum content of nutrients (percentage by weight) and other requirements:

Total: 18 %, (N + P2O5)

For each of the nutrients: 3 % N, 5 % P2O5

Maximum biuret content: ureic N × 0,026

Forms, solubilities and nutrient content to be declared as specified in columns 4, 5 and 6 — Particle size

Data for identification of the fertilisers — Other requirements

N

P2O5

K2O

N

P2O5

K2O

1

2

3

4

5

6

(1)

Total nitrogen

(2)

Nitric nitrogen

(3)

Ammoniacal nitrogen

(4)

Ureic nitrogen

Water-soluble P2O5

 

(1)

Total nitrogen

(2)

If any of the forms of nitrogen (2), (3) and (4) amounts to not less than 1 % by weight, it must be declared

(3)

If the biuret content is less than 0,2 %, the words “low in biuret” may be added

Water-soluble P2O5

 


C.2.6

Type designation:

NP-fertiliser solution containing urea formaldehyde

Data on method of production:

Product obtained chemically and by dissolution in water, in a form stable at atmospheric pressure, without addition of organic nutrients of animal or vegetable origin and containing urea formaldehyde

Minimum content of nutrients (percentage by weight) and other requirements:

Total 18 % (N +P2O5)

For each of the nutrients:

5 % N, at least 25 % of the declared content of total nitrogen must derive from nitrogen form (5)

5 % P2O5

Maximum biuret content: (ureic N + urea formaldehyde N) × 0,026

Forms, solubilities and nutrient content to be declared as specified in columns 4, 5 and 6 — Particle size

Data for identification of the fertilisers — Other requirements

N

P2O5

K2O

N

P2O5

K2O

1

2

3

4

5

6

(1)

Total nitrogen

(2)

Nitric nitrogen

(3)

Ammoniacal nitrogen

(4)

Ureic nitrogen

(5)

Nitrogen from urea formaldehyde

Water-soluble P2O5

 

(1)

Total nitrogen

(2)

If any of the forms of nitrogen (2), (3) and (4) amounts to not less than 1 % by weight, it must be declared

(3)

Nitrogen from urea formaldehyde

(4)

If the biuret content is less than 0,2 %, the words “low in biuret” may be added

Water-soluble P2O5

 


C.2.7

Type designation:

NP-fertiliser suspension

Data on method of production:

Product in liquid form, in which the nutrients are derived from substances both in solution and in suspension in the water, without addition of organic nutrients of animal or vegetable origin

Minimum content of nutrients (percentage by weight) and other requirements:

Total: 18 %, (N + P2O5)

For each of the nutrients: 3 % N, 5 % P2O5

Maximum biuret content: ureic N × 0,026

Forms, solubilities and nutrient content to be declared as specified in columns 4, 5 and 6 — Particle size

Data for identification of the fertilisers. Other requirements

N

P2O5

K2O

N

P2O5

K2O

1

2

3

4

5

6

(1)

Total nitrogen

(2)

Nitric nitrogen

(3)

Ammoniacal nitrogen

(4)

Ureic nitrogen

(1)

Water-soluble P2O5

(2)

P2O5 soluble in neutral ammonium citrate

(3)

P2O5 soluble in neutral ammonium citrate and water

 

(1)

Total nitrogen

(2)

If any of the forms of nitrogen (2), (3) and (4) amounts to not less than 1 % by weight, it must be declared

(3)

If the biuret content is less than 0,2 %, the words “low in biuret” may be added

The fertilisers may not contain Thomas slag, aluminium calcium phosphate, calcined phosphates, partially solubilised phosphate or rock phosphates

(1)

If the water-soluble P2O5 is less than 2 % only solubility 2 shall be declared

(2)

If the water-soluble P2O5 is at least 2 %, solubility 3 will be declared and the water-soluble P2O5 content must be stated

 


C.2.8

Type designation:

NP-fertiliser suspension containing urea formaldehyde

Data on method of production:

Product in liquid form, in which the nutrients are derived from substances both in solution and in suspension in water, without addition of organic nutrients of animal or vegetable origin and containing urea formaldehyde

Minimum content of nutrients (percentage by weight) and other requirements:

Total 18 % (N +P2O5)

For each of the nutrients:

5 % N, at least 25 % of the declared content of total nitrogen must derive from nitrogen form (5)

At least 3/5 of the declared nitrogen content (5) must be soluble in hot water

5 % P2O5

Maximum biuret content: (ureic N + urea formaldehyde N) × 0,026

Forms, solubilities and nutrient content to be declared as specified in columns 4, 5 and 6 — Particle size

Data for identification of the fertilisers — Other requirements

N

P2O5

K2O

N

P2O5

K2O

1

2

3

4

5

6

(1)

Total nitrogen

(2)

Nitric nitrogen

(3)

Ammoniacal nitrogen

(4)

Ureic nitrogen

(5)

Nitrogen from urea formaldehyde

(1)

Water-soluble P2O5

(2)

P2O5 soluble in neutral ammonium citrate

(3)

P2O5 soluble in neutral ammonium citrate and in water

 

(1)

Total nitrogen

(2)

If any of the forms of nitrogen (2), (3) (4) amounts to not less than 1 % by weight, it must be declared

(3)

Nitrogen from urea formaldehyde

(4)

If the biuret content is less than 0,2 %, the words “low in biuret” may be added

The fertilisers must not contain Thomas slag, aluminium calcium phosphate, calcined phosphates, partially solubilised phosphates or rock phosphates

(1)

If the water-soluble P2O5 is less than 2 %, only solubility (2) shall be declared

(2)

If the water-soluble P2O5 is at least 2 %, solubility (3) and the water-soluble P2O5 content shall be declared’

 

(b)

the following entries C.2.9 to C.2.14 are added:

‘C.2.9

Type designation:

NK-fertiliser solution

Data on method of production:

Product obtained chemically and by dissolution in water, in a form stable at atmospheric pressure, without addition of organic nutrients of animal or vegetable origin

Minimum content of nutrients (percentage by weight) and other requirements:

Total: 15 % (N + K2O)

For each of the nutrients: 3 % N, 5 % K2O

Maximum biuret content: ureic N × 0,026

Forms, solubilities and nutrient content to be declared as specified in columns 4, 5 and 6 — Particle size

Data for identification of the fertilisers — Other requirements

N

P2O5

K2O

N

P2O5

K2O

1

2

3

4

5

6

(1)

Total nitrogen

(2)

Nitric nitrogen

(3)

Ammoniacal nitrogen

(4)

Ureic nitrogen

 

Water-soluble K2O

(1)

Total nitrogen

(2)

If any of the forms of nitrogen (2), (3) and (4) amounts to not less than 1 % by weight, it must be declared

(3)

If the biuret content is less than 0,2 %, the words “low in biuret” may be added

 

(1)

Water-soluble potassium oxide

(2)

The words “low in chloride” may be used only where the Cl content does not exceed 2 %

(3)

The chloride content may be declared


C.2.10

Type designation:

NK-fertiliser solution containing urea formaldehyde

Data on method of production:

Product obtained chemically and by dissolution in water, in a form stable at atmospheric pressure, without addition of organic nutrients of animal or vegetable origin and containing urea formaldehyde

Minimum content of nutrients (percentage by weight) and other requirements:

Total 15 % (N + K2O)

For each of the nutrients:

5 % N, at least 25 % of the declared content of total nitrogen must derive from nitrogen form (5)

5 % K2O

Maximum biuret content: (ureic N + urea formaldehyde N) × 0,026

Forms, solubilities and nutrient content to be declared as specified in columns 4, 5 and 6 — Particle size

Data for identification of the fertilisers — Other requirements

N

P2O5

K2O

N

P2O5

K2O

1

2

3

4

5

6

(1)

Total nitrogen

(2)

Nitric nitrogen

(3)

Ammoniacal nitrogen

(4)

Ureic nitrogen

(5)

Nitrogen from urea formaldehyde

 

Water-soluble K2O

(1)

Total nitrogen

(2)

If any of the forms of nitrogen (2), (3) and (4) amounts to not less than 1 % by weight, it must be declared

(3)

Nitrogen from urea formaldehyde

(4)

If the biuret content is less than 0,2 %, the words “low in biuret” may be added

 

(1)

Water-soluble potassium oxide

(2)

The words “low in chloride” may be used only where the Cl content does not exceed 2 %

(3)

The chloride content may be declared


C.2.11

Type designation:

NK-fertiliser suspension

Data on method of production:

Product in liquid form, in which the nutrients are derived from substances both in solution and in suspension in the water, without addition of organic nutrients of animal or vegetable origin

Minimum content of nutrients (percentage by weight) and other requirements:

Total: 18 % (N + K2O)

For each of the nutrients: 3 % N, 5 % K2O

Maximum biuret content: ureic N × 0,026

Forms, solubilities and nutrient content to be declared as specified in columns 4, 5 and 6 — Particle size

Data for identification of the fertilisers — Other requirements

N

P2O5

K2O

N

P2O5

K2O

1

2

3

4

5

6

(1)

Total nitrogen

(2)

Nitric nitrogen

(3)

Ammoniacal nitrogen

(4)

Ureic nitrogen

 

Water-soluble K2O

(1)

Total nitrogen

(2)

If any of the forms of nitrogen (2), (3) and (4) amounts to not less than 1 % by weight, it must be declared

(3)

If the biuret content is less than 0,2 %, the words “low in biuret” may be added

 

(1)

Water-soluble potassium oxide

(2)

The words “low in chloride” may be used only where the Cl content does not exceed 2 %

(3)

The chloride content may be declared


C.2.12

Type designation:

NK-fertiliser suspension containing urea formaldehyde

Data on method of production:

Product in liquid form, in which the nutrients are derived from substances both in solution and in suspension in water, without addition of organic nutrients of animal or vegetable origin and containing urea formaldehyde

Minimum content of nutrients (percentage by weight) and other requirements:

Total 18 %(N +K2O)

For each of the nutrients:

5 % N, at least 25 % of the declared content of total nitrogen must derive from nitrogen form (5)

At least 3/5 of the declared nitrogen content (5) must be soluble in hot water

5 % K2O

Maximum biuret content: (ureic N + urea formaldehyde N) × 0,026

Forms, solubilities and nutrient content to be declared as specified in columns 4, 5 and 6 — Particle size

Data for identification of the fertilisers — Other requirements

N

P2O5

K2O

N

P2O5

K2O

1

2

3

4

5

6

(1)

Total nitrogen

(2)

Nitric nitrogen

(3)

Ammoniacal nitrogen

(4)

Ureic nitrogen

(5)

Nitrogen from urea formaldehyde

 

Water-soluble K2O

(1)

Total nitrogen

(2)

If any of the forms of nitrogen (2), (3) and (4) amounts to not less than 1 % by weight, it must be declared

(3)

Nitrogen from urea formaldehyde

(4)

If the biuret content is less than 0,2 %, the words “low in biuret” may be added

 

(1)

Water-soluble potassium oxide

(2)

The words “low in chloride” may be used only where the Cl content does not exceed 2 %

(3)

The chloride content may be declared


C.2.13

Type designation:

PK-fertiliser solution

Data on method of production:

Product obtained chemically and by dissolution in water, without addition of organic nutrients of animal or vegetable origin

Minimum content of nutrients (percentage by weight) and other requirements:

Total: 18 % (P2O5 + K2O)

For each of the nutrients: 5 % P2O5, 5 % K2O

Forms, solubilities and nutrient content to be declared as specified in columns 4, 5 and 6 — Particle size

Data for identification of the fertilisers — Other requirements

N

P2O5

K2O

N

P2O5

K2O

1

2

3

4

5

6

 

Water-soluble P2O5

Water-soluble K2O

 

Water-soluble P2O5

(1)

Water-soluble potassium oxide

(2)

The words “low in chloride” may be used only where the Cl content does not exceed 2 %

(3)

The chloride content may be declared


C.2.14

Type designation:

PK-fertiliser suspension

Data on method of production:

Product in liquid form, in which the nutrients are derived from substances both in solution and in suspension in water, without addition of organic nutrients of animal or vegetable origin

Minimum content of nutrients (percentage by weight) and other requirements:

Total: 18 % (P2O5 + K2O)

For each of the nutrients: 5 % P2O5, 5 % K2O

Forms, solubilities and nutrient content to be declared as specified in columns 4, 5 and 6 — Particle size

Data for identification of the fertilisers — Other requirements

N

P2O5

K2O

N

P2O5

K2O

1

2

3

4

5

6

 

(1)

Water-soluble P2O5

(2)

P2O5 soluble in neutral ammonium citrate

(3)

P2O5 soluble in neutral ammonium citrate and water

Water-soluble K2O

 

The fertilisers must not contain Thomas slag, aluminium calcium phosphate, calcined phosphates, partially solubilised phosphates or rock phosphates

(1)

If the water-soluble P2O5 is less than 2 % only solubility 2 will be declared

(2)

If the water-soluble P2O5 is at least 2 % solubility 3 and the water-soluble P2O5 content shall be declared

(1)

Water-soluble potassium oxide

(2)

The words “low in chloride” may be used only where the Cl content does not exceed 2 %

(3)

The chloride content may be declared’

(3)

in Table F.1, the following entry 4 is added:

‘4

3,4-dimethyl-1H-pyrazole phosphate (DMPP)

EC No 424-640-9

Minimum: 0,8

Maximum: 1,6’

 

 

(4)

in Table F.2, the following entry 3 is added:

‘3

Reaction mixture of N-butyl-thiophosphoric-triamide (NBPT) and N-propyl- thiosphosphoric- triamide (NPPT) (ratio 3:1 (1))

EC No 700-457-2

Minimum: 0,02

Maximum: 0,3’

 

 


(1)  Tolerance on the portion of N-propyl-thiophosphoric-triamide (NPPT): 20 %.


ANNEX II

In Annex IV, Section B, to Regulation (EC) No 2003/2003, the following methods are added:

‘Method 12.6

Determination of DMPP

EN 16328: Fertilizers — Determination of 3, 4-dimethyl-1H-pyrazole phosphate (DMPP) — Method using high-performance liquid chromatography (HPLC)

This method of analysis has been ring-tested.

Method 12.7

Determination of NBPT/NPPT

EN 16651: Fertilizers — Determination of N-(n-Butyl)thiophosphoric acid triamide (NBPT) and N-(n-Propyl)thiophosphoric acid triamide (NPPT) — Method using high-performance liquid chromatography (HPLC)

This method of analysis has been ring-tested.’