# The Fertilisers Regulations 1990, COMPOUND FERTILISERS


Group
Name of Material
Meaning
Declarations
Limits of variation (absolute value in percentage by weight, except where otherwise specified)
(1)
(2)
(3)
(4)
(5)
(6)
*As determined by the Petermann method.
1
NPK Fertilisers
Product obtained chemically or by blending, without addition of organic nutrients of animal or vegetable origin, containing by weight:—
1 Not less than 3% nitrogen (N).
2 Not less than 5% phosphorus pentoxide (P2O5);
3 Not less than 5% potassium oxide (K2O).
The sum of the three nutrients must be not less than 20% by weight. The product must not contain basic slag, Thomas phosphate, Thomas slag, calcined phosphate, aluminium-calcium phosphate, soft ground rock phosphate, or partially solubilised rock phosphate.
The P2O5 content soluble only in mineral acids must not exceed 2%.
Nitrogen (N)
EEC fertiliser
Other than EEC fertilisers
Amount of total nitrogen.
Amount, where equal to or greater than 1% by weight of:—
Amount of total nitrogen.
Amount of ureic nitrogen save that a declaration of 10% or less need not be made.
1 nitric nitrogen
2 ammoniacal nitrogen
3 ureic nitrogen
4 cyanamide nitrogen
N 1.1
As set out in paragraph 7 of this Schedule
N 0.5
Where phosphorus pentoxide soluble in water is less than 2% amount of:—
1 Phosphorus pentoxide soluble in neutral ammonium citrate.
Where phosphorus pentoxide soluble in water is equal to or greater than 2% amount of:—
1 Phosphorus pentoxide soluble in neutral ammonium citrate and in water.
P2O5 1.1
P2O5 0.5
2 Phosphorus pentoxide soluble in water.
As set out in paragraph 7(a) of this Schedule
Potassium oxide (K2O)
Amount of potassium oxide soluble in water.
K2O 1.1
N
}
+P2O5
} 1.9
+K2
}
K2O 0.5
Optical declaration
Amount of chlorine.
Where the chlorine content is not greater than 2% the statement “low in chlorine” may be made.
C1 0.2
N 1.1
N 0.5
NPK fertiliser containing aluminium-calcium phosphate
Product obtained chemically or by blending, without addition of organic nutrients of animal or vegetable origin, containing by weight:—
1 Not less than 3% nitrogen (N).
2 Not less than 57percnt; phosphorus pentoxide (P2O5) of which at least 2% must be soluble in water, and at least 5% soluble in mineral acids; and
3 Not less than 5% potassium oxide (K2O).
Nitrogen (N)
EEC fertiliser
Other than EEC fertilisers
Amount of total nitrogen.
Amount, where equal to or greater than 1% by weight of:—
Amount of total nitrogen.
Amount of ureic nitrogen save that a declaration of 10% or less need not be made.
As set out in paragraph 7 of this Schedule
The sum of the three nutrients must be not less than 20% by weight. At least 75% of the declared phosphorus pentoxide soluble in mineral acids must be soluble in alkaline ammonium citrate (Joulie). The product must not contain basic slag, Thomas Phosphate, Thomas slag, calcined phosphate, soft ground rock phosphate or partially solubilised rock phosphate, and not less than 90% of the aluminium-calcium phosphate should be able to pass through a sieve with a mesh of 0.160 mm.
1 nitric nitrogen
2 ammoniacal nitrogen
3 cyanamide nitrogen
4 ureic nitrogen
P2O5 1.1
P2O5 0.5
Phosphorus Pentoxide (P2P5)
Amount of phosphorus pentoxide soluble in mineral acids.
Amount of phosphorus pentroxide soluble in water.
Amount of phosphorus pentoxide soluble in mineral acids (after deduction of the amount of phosphorus pentoxide soluble in water).
Amount of phosphorus pentoxide soluble in alkaline ammonium citrate.
As set out in paragraph 7(a)of this Schedule
Potassium Oxide (K2O)
Amount of potassium oxide soluble in water.
K2O 1.1
N
}
+P2O5
} 1.9
+K2O
}
K2O 0.5
Optional declarations
Amount of chlorine.
Where the chlorine content is not greater than 2% the statement “low in chlorine” may be made.
Cl 0.2
NPK fertiliser containing soft ground rock phosphate
NPK fertiliser containing partially solubilised rock phosphate
Product obtained chemically or by blending, without addition of organic nutrients of animal or vegetable origin, containing by weight:—
1 Not less than 3% nitrogen (N).
2 Not less than 5% phosphorus pentoxide (P2O5) of which at least 2% should be soluble only in mineral acids, at least 5% soluble in neutral ammonium citrate and in water and at least 2.5% soluble in water;
3 Not less than 5% potassium oxide (K2O).
Nitrogen (N)
EEC fertiliser
Other than EEC fertilisers
Amount of total nitrogen.
Amount, where equal to or greater than 1% by weight of:—
Amount of total nitrogen.
Amount of ureic nitrogen save that a declaration of 10% or less need not be made.
1 nitric nitrogen
2 ammoniacal nitrogen
3 ureic nitrogen
4 cyanamide nitrogen
N 1.1
As set out in paragraph 7 of this Schedule
N 0.5
The sum of the three nutrients must be not less than 20% by weight. Neither product must contain basic slag, Thomas phosphate, Thomas slag, calcined phosphate or aluminium-calcium phosphate. Not less than 90% of the soft ground rock phosphate should be able to pass through a sieve with a mesh of 0.063mm, and not less than 90% of the partially solubilised rock phosphate should be able to pass through a sieve with a mesh of 0.160 mm.
Phosphorus Pentoxide P2O5
Amount of phosphorus pentoxide soluble in mineral acids.
Amount of phosphorus pentoxide soluble in water.
Amount of phosphorus pentoxide soluble in neutral ammonium citrate and in water.
Amount of phosphorus pentoxide soluble only in mineral acids.
P2O5 1.1
As set out in paragraph 7(a) of this Schedule
P2P5 0.5
Potassium Oxide (K2O)
Amount of potassium oxide soluble in water.
K2O 1.1
N
}
+P2O5
} 1.9
+K2O
}
K2O 0.5
Optional declarations
Amount of chlorine.
Where the chlorine content is not greater than 2% the statement “low in chlorine” may be made.
Cl 0.2
NPK fertiliser (Phosphate ingredient, aluminium-calcium phosphate only)
Product obtained chemically or by blending, without addition of organic nutrients of animal or vegetable origin, containing by weight:—
1 Not less than 3% nitrogen (N);
2 Not less than 5% phosphorus pentoxide (P2O5);
3 Not less than 5% potassium oxide (K2O).
Nitrogen (N)
EEC fertiliser
Other than EEC fertilisers
Amount of total nitrogen.
Amount, where equal to or greater than 1% by weight of:—
Amount of total nitrogen.
Amount of ureic nitrogen save that a declaration of 10% or less need not be made.
1 nitric nitrogen
2 ammoniacal nitrogen
3 ureic nitrogen
4 cyanamide nitrogen
N 1.1
As set out in paragraph 7 of this Schedule
N 0.5
The sum of the three nutrients must be not less than 20% by weight. At least 75% of the declared phosphorus pentoxide soluble in alkaline ammonium citrate (Joulie). The product must not contain any phosphate material other than aluminium-calcium phosphate and not less than 90% of the aluminium-calcium phosphate should be able to pass through a sieve with a mesh of 0.160 mm.
Phosphorus Pentoxide (P2O5)
Amount of phosphorus pentoxide soluble in mineral acids.
Amount of phosphorus pentoxide soluble in alkaline ammonium citrate.
P2O5 1.1
As set out in paragraph 7(a) of this Schedule
P2O5 0.5
Potassium Oxide (K2O)
Amount of potassium oxide soluble in water.
K2O 1.1
N
}
+P2O5
} 1.9
+K2O
}
K2O 0.5
Optional declarations
Amount of chlorine.
Where the chlorine content is not greater than 2% the statement “low in chlorine” may be made.
Cl 0.2
NPK fertiliser (Phosphate ingredient; calcined phosphate only)
Product obtained chemically or by blending, without addition of organic nutrients of animal or vegetable origin, containing by weight:—
1 Not less than 3% nitrogen (N).
2 Not less than 5% phosphorus pentoxide (P2O5);
3 Not less than 5% potassium oxide (K2O).
The sum of the three nutrients must be not less than 20 % by weight. The product must not contain any phosphate material other than calcined phosphate. Not less than 75 % of the calcined phosphate should be able to pass through a sieve with a mesh of 0.160 mm.
Nitrogen (N)
EEC fertiliser
Other than EEC fertilisers
Amount, where equal to or greater than 1% by weight of:—
Amount, where equal to or greater than 1% by weight, of:—
Amount of total nitrogen.
Amount of ureic nitrogen save that a declaration of 10% or less need not be made.
1 nitric nitrogen
2 ammoniacal nitrogen
3 ureic nitrogen
4 cyanamide nitrogen
N 1.1
As set out in paragraph 7 of this Schedule
N 0.5
Phosphorus Pentoxide (P2O5)
Amount of phosphorus pentoxide soluble in alkaline ammonium citrate*
P2O5 1.1
P2O5 0.5
Potassium Oxide (K2O)
Amount of potassium oxide soluble in water.
K2O 1.1
N
}
+P2O5
} 1.9
+K2O
}
K2O 0.5
Optional declarations
Amount of chlorine.
Where the chlorine content is not greater than 2% the statement “low in chlorine” may be made.
Cl 0.2
NPK fertiliser (Phosphate ingredient; soft ground rock phosphate only)
Product obtained chemically or by blending, without addition of organic nutrients of animal or vegetable origin, containing by weight:—
1 Not less than 3% nitrogen (N).
2 Not less than 5% phosphorus pentoxide (P2O5);
3 Not less than 5% potassium oxide (K2O).
The sum of the three nutrients must be not less than 20% by weight. At least 55% of the declared phosphorus pentoxide soluble in mineral acids must be soluble in 2% formic acid. The product must not contain any phosphate material other than soft ground rock phosphate. Not less than 90% of the soft ground rock phosphate should be able to pass through a sieve with a mesh of 0.063 mm.
Nitrogen (N)
EEC fertiliser
Other than EEC fertilisers
Amount of total nitrogen.
Amount, where equal to or greater than 1% by weight of:—
Amount of total nitrogen.
Amount of ureic nitrogen save that a declaration of 10% or less need not be made.
1 nitric nitrogen
2 ammoniacal nitrogen
3 ureic nitrogen
4 cyanamide nitrogen
N 1.1
As set out in paragraph 7 of this Schedule
N 0.5
Phosphorus Pentoxide (P2O5)
Amount of phosphorus pentoxide soluble in mineral acids.
Amount of phosphorus pentoxide soluble in 2% formic acid.
P2O5 1.1
As set out in paragraph 7(a) of this Schedule
P2O5 0.5
Potassium Oxide (K2O)
Amount of potassium oxide soluble in water.
K2O 1.1
N
}
+P2O5
} 1.9
+K2O
}
K2O 0.5
Optional declarations
Amount of chlorine.
Where the chlorine content is not greater than 2% the statement “low in chlorine” may be made.
Cl 0.2
NPK fertiliser (Phosphate ingredient: basic slag only)
NPK fertiliser (Phosphate ingredient: Thomas phosphate only)
NPK fertiliser (Phosphate ingredient: Thomas slag only
Product obtained chemically or by blending, without addition of organic nutrients of animal or vegetable origin, containing by weight:—
1 not less than 3% nitrogen (N).
2 not less than 5% potassium oxide (K2O).
3 not less than 5% potassium oxide (K2O).
The sum of the three nutrients must be not less than 20% by weight. The product must not contain any phosphate material other than basic slag, Thomas phosphate or Thomas slag.
Not less than 75% of the basic slag, Thomas phosphate or Thomas slag should be able to pass through a sieve with a mesh of 0.160 mm.
Nitrogen (N)
EEC fertiliser
Other than EEC fertilisers
Amount of total nitrogen.
Amount, where equal to or greater than 1% by weight of:—
Amount of total nitrogen.
Amount of ureic nitrogen save that a declaration of 10% or less need not be made.
1 nitric nitrogen
2 ammoniacal nitrogen
3 ureic nitrogen
4 cyanamide nitrogen
N 1.1
As set out in paragraph 7 of this Schedule
N 0.5
Phosphorus Pentoxide (P2O5)
Amount of phosphorus pentoxide soluble in 2% citric acid.
P2O5 1.1
P2O5 0.5
Potassium Oxide (K2O)
Amount of potassium oxide soluble in water.
K2O 1.1
N
}
+P2O5
} 1.9
+K2O
}
K2O 0.5
Optional declarations
Amount of chlorine.
Where the chlorine content is not greater than 2% the statement “low in chlorine” may be made.
Cl 0.2
NP Fertiliser
Product obtained chemically or by blending, without addition of organic nutrients of animal or vegetable origin, containing by weight:—
1 Not less than 3% nitrogen (N);
2 Not less than 5% phosphorus pentoxide (P2O5).
The sum of the two nutrients must be not less than 18% by weight. The product must not contain basic slag, Thomas phosphate, Thomas slag, calcined phosphate, aluminium-calcium phosphate, soft ground rock phosphate or partially solubilised rock phosphate.
The P2O5 content soluble only in mineral acids must not exceed 2%.
Nitrogen (N)
EEC fertiliser
Other than EEC fertilisers
Amount of total nitrogen.
Amount, where equal to or greater than 1% by weight of:—
Amount of total nitrogen.
Amount of ureic nitrogen save that a declaration of 10% or less need not be made.
1 nitric nitrogen
2 ammoniacal nitrogen
3 ureic nitrogen
4 cyanamide nitrogen
N 1.1
As set out in paragraph 7 of this Schedule
N 0.5
Phosphorus Pentoxide (P2O5)
Where phosphorus pentoxide soluble in water is less than 2% amount of:—
1 Phosphorus pentoxide soluble in neutral ammonium citrate.
Where phosphorus pentoxide soluble in water is equal to or greater than 2%, amount of:—
1 Phosphorus pentoxide soluble in neutral ammonium citrate and in water.
P2O5 1.1
As set out in paragraph 7(a) of this Schedule
P2O5 0.5
2 Phosphorus pentoxide soluble in water.
N
}
+P2O5
} 1.5
2
NP fertiliser containing aluminium-calcium phosphate
Product obtained chemically or by blending without addition of organic nutrients of animal or vegetable origin, containing by weight:—
1 Not less than 3% nitrogen (N);
2 Not less than 5% phosphorus pentoxide (P2O5) of which at least 2% must be soluble in water, and at least 5% soluble in mineral acids.
The sum of the two nutrients must be not less than 18% by weight. At least 75% of the declared phosphorus pentoxide soluble in mineral acids must be soluble in alkaline ammonium citrate (Joulie). The product must not contain basic slag, Thomas phosphate, Thomas slag, calcined phosphate, soft ground rock phosphate or partially solubilised rock phosphate, and not less than 90% of the aluminium-calcium phosphate should be able to pass through a sieve with a mesh of 0.160 mm.
Nitrogen (N)
EEC fertiliser
Other than EEC fertilisers
Amount of total nitrogen.
Amount, where equal to or greater than 1% by weight of:—
Amount of total nitrogen.
Amount of ureic nitrogen save that a declaration of 10% or less need not be made.
1 nitric nitrogen
2 ammoniacal nitrogen
3 ureic nitrogen
4 cyanamide nitrogen
N 1.1
As set out in paragraph 7 of this Schedule
N 0.5
Phosphorus Pentoxide (P2O5)
Amount of phosphorus pentoxide soluble in mineral acids.
Amount of phosphorus pentoxide soluble in water.
P2O5 1.1
P2O5 0.5
Amount of phosphorus pentoxide soluble in mineral acids (after deduction of the amount of phosphorus pentoxide soluble in water).
Amount of phosphorus pentoxide soluble in alkaline ammonium citrate.
As set out in paragraph 7(a) of this schedule
N
}
+P2O5
} 1.5
NP fertiliser containing soft ground rock phosphate
NP fertiliser containing partially solubilised rock phosphate
Product obtained chemically or by blending, without addition of organic nutrients of animal or vegetable origin, containing by weight:
1 not less than 3% nitrogen (N);
2 not less than 5% phosphorus pentoxide (P2O5) of which at least 2% should be soluble only in mineral acids, at least 5% soluble in neutral ammonium citrate and in water and at least 2.5% soluble in water.
The sum of the two nutrients must be not less than 18% by weight. Neither product must contain basic slag, Thomas phosphate, Thomas slag, calcined phosphate or aluminium-calcium phosphate. Not less than 90% of the soft ground rock phosphate should be able to pass through a sieve with a mesh of 0.063 mm, and not less than 90% of the partially solubilised rock phosphate should be able to pass through a sieve with a mesh of 0.160 mm.
Nitrogen (N)
EEC fertiliser
Other than EEC fertilisers
Amount of total nitrogen.
Amount, where equal to or greater than 1% by weight of:—
Amount of total nitrogen.
Amount of ureic nitrogen save that a declaration of 10% or less need not be made.
1 nitric nitrogen
2 ammoniacal nitrogen
3 ureic nitrogen
4 cyanamide nitrogen
N 1.1
As set out in paragraph 7 of this Schedule
N 0.5
Phosphorus Pentoxide (P2O5)
Amount of phosphorus pentoxide soluble in mineral acids.
Amount of phosphorus pentoxide soluble in water.
P2O5 1.1
P2O5 0.5
Amount of phosphorus pentoxide soluble in neutral ammonium citrate and in water.
Amount of phosphorus pentoxide soluble only in mineral acids.
As set out in paragraph 7(a) of this Schedule
N
}
+P2O5
} 1.5
NP fertiliser (Phosphate ingredient: aluminium-calcium phosphate only)
Product obtained chemically or by blending, without addition of organic nutrients of animal or vegetable origin, containing by weight:—
1 Not less than 3% nitrogen (N);
2 Not less than 5% phosphorus pentoxide (P2O5).
The sum of the two nutrients must be not less than 18% by weight. At least 75% of the declared phosphorus pentoxide soluble in mineral acids must be soluble in alkaline ammonium citrate (Joulie). The product must not contain any phosphate material other than aluminium-calcium phosphate and not less than 90% of the aluminium-calcium phosphate should be able to pass through a sieve with a mesh of 0.160 mm.
Nitrogen (N)
EEC fertiliser
Other than EEC fertilisers
Amount of total nitrogen.
Amount, where equal to or greater than 1% by weight of:—
Amount of total nitrogen.
Amount of ureic nitrogen save that a declaration of 10% or less need not be made.
1 nitric nitrogen
2 ammoniacal nitrogen
3 ureic nitrogen
4 cyanamide nitrogen
N 1.1
As set out in paragraph 7 of this Schedule
N 0.5
Phosphorus Pentoxide (P2O5)
Amount of phosphorus pentoxide soluble in mineral acids.
P2O5 1.1
P2O5 0.5
Amount of phosphorus pentoxide soluble in alkaline ammonium citrate.
As set out in paragraph 7(a) of this Schedule
N
}
+P2O5
} 1.5
NP fertiliser (Phosphate ingredient: calcined phosphate only)
Product obtained chemically or by blending, without addition of organic nutrients of animal or vegetable origin, containing by weight:—
1 Not less than 3% nitrogen (N);
2 Not less than 5% phosphorus pentoxide (P2O5).
The sum of the two nutrients must be not less than 18% by weight. The product must not contain any phosphate material other than calcined phosphate. Not less than 75% of the calcined phosphate should be able to pass through a sieve with a mesh of 0.160 mm.
Nitrogen (N)
EEC fertiliser
Other than EEC fertilisers
Amount of total nitrogen.
Amount, where equal to or greater than 1% by weight of:—
Amount of total nitrogen.
Amount of ureic nitrogen save that a declaration of 10% or less need not be made.
1 nitric nitrogen
2 ammoniacal nitrogen
3 ureic nitrogen
4 cyanamide nitrogen
N 1.1
As set out in paragraph 7 of this Schedule
N 0.5
Phosphorus Pentoxide (P2O5)
Amount of phosphorus pentoxide soluble in alkaline ammonium citrate*.
P2O5 1.1
N
}
+P2O5
} 1.5
P2O5 0.5
NP fertiliser (Phosphate ingredient: soft ground rock phosphate only)
Product obtained chemically or by blending, without addition of organic nutrients of animal or vegetable origin, containing by weight:—
1 Not less than 3% nitrogen (N);
2 Not less than 5% phosphorus pentoxide (P2O5).
The sum of the two nutrients must be not less than 18% by weight. At least 55% of the declared phosphorus pentoxide soluble in mineral acids must be soluble in 2% formic acid. The product must not contain any phosphate material other than soft ground rock phosphate. Not less than 90% of the soft ground rock phosphate should be able to pass through a sieve with a mesh of 0.063 mm.
Nitrogen (N)
EEC fertiliser
Other than EEC fertilisers
Amount of total nitrogen.
Amount, where equal to or greater than 1% by weight of:—
Amount of total nitrogen.
Amount of ureic nitrogen save that a declaration of 10% or less need not be made.
1 nitric nitrogen
2 ammoniacal nitrogen
3 ureic nitrogen
4 cyanamide nitrogen
N 1.1
As set out in paragraph 7 of this Schedule
N 0.5
Phosphorus Pentoxide (P2O5)
Amount of phosphorus pentoxide soluble in mineral acids.
P2O5 1.1
P2O5 0.5
Amount of phosphorus pentoxide soluble in 2% formic acid.
As set out in paragraph 7 of this Schedule
N
}
+P2O5
} 1.5
NP fertiliser (Phosphate ingredient: basic slag only)
NP fertiliser (Phosphate ingredient: Thomas Phosphate only)
NP fertiliser (Phosphate ingredient: Thomas slag only)
Product obtained chemically or by blending, without addition of organic nutrients of animal or vegetable origin, containing by weight:—
1 Not less than 3% nitrogen (N).
2 Not less than 5% phosphorus pentoxide (P2O5).
The sum of the two nutrients must be not less than 18% by weight. The product must not contain any phosphate material other than basic slag, Thomas phosphate or Thomas slag. Not less than 75% of the basic slag, Thomas phosphate or Thomas slag should be able to pass through a sieve with a mesh of 0.160 mm.
Nitrogen (N)
EEC fertiliser
Other than EEC fertilisers
Amount of total nitrogen.
Amount, where equal to or greater than 1% by weight of:—
Amount of total nitrogen.
Amount of ureic nitrogen save that a declaration of 10% or less need not be made.
1 nitric nitrogen
2 ammoniacal nitrogen
3 ureic nitrogen
4 cyanamide nitrogen
N 1.1
As set out in paragraph 7 of this Schedule
N 0.5
Phosphorus Pentoxide (P2O5)
Amount of phosphorus pentoxide soluble in 2% citric acid.
P2O5 1.1
N
}
+P2O5
} 1.5
P2O5 0.5
3
NK fertiliser
Product obtained chemically or by blending, without addition of organic nutrients of animal or vegetable origin, containing by weight:—
1 Not less than 3% nitrogen (N).
2 Not less than 5% potassium oxide (K2O).
The sum of the two nutrients must be not less than 18% by weight.
Nitrogen (N)
EEC fertiliser
Other than EEC fertilisers
Amount of total nitrogen.
Amount, where equal to or greater than 1% by weight of:—
Amount of total nitrogen.
Amount of ureic nitrogen save that a declaration of 10% or less need not be made.
1 nitric nitrogen
2 ammoniacal nitrogen
3 ureic nitrogen
4 cyanamide nitrogen
N 1.1
As set out in paragraph 7 of this Schedule
N 0.5
Potassium Oxide (K2O)
Amount of potassium oxide soluble in water.
K2O 1.1
N
}
++K2O
} 1.5
K2O 0.5
Optional declarations.
Amount of chlorine.
Where the chlorine content is not greater than 2% the statement “low in chlorine” may be made.
C1 0.2
4
PK fertiliser
Product obtained chemically or by blending, without addition of organic nutrients of animal or vegetable origin, containing by weight:—
1 Not less than 5% phosphorus pentoxide (P2O5);
2 Not less than 5% potassium oxide (K2O).
The sum of the two nutrients must be not less than 18% by weight. The product must not contain basic slag, Thomas phosphate, Thomas slag, calcined phosphate, aluminium-calcium phosphate, soft ground rock phosphate, or partially solubilised rock phosphate.
The P2O5 content soluble only in mineral acids must not exceed 2%.
Phosphorus Pentoxide (P2O5)
Where phosphorus pentoxide soluble in water is less than 2% amount of:—
1 Phosphorus pentoxide soluble in neutral ammonium citrate.
Where phosphorus pentoxide soluble in water is equal to or greater than 2%,amount of:—
1 Phosphorus pentoxide soluble in neutral ammonium citrate and in water.
2 Phosphorus pentoxide soluble in water.
P2Ot 1.1
As set out in paragraph 7(a) of this Schedule.
P2O5 0.5
Potassium Oxide (K2O)
Amount of potassium oxide soluble in water.
K2O 1.1
P2O5
}
++K2O
} 1.5
K2O 0.5
Optional declarations
Amount of chlorine.
Where the chlorine content is not greater than 2% the statement “low in Chlorine” may be made.
C1 0.2
PK fertiliser containing aluminium-calcium phosphate
Product obtained chemically or by blending, without addition of organic nutrients of animal or vegetable origin, containing by weight:—
1 Not less than 5% phosphorus pentoxide (P2O5) of which at least 2% must be soluble in water, and at least 5% soluble in mineral acids.
2 Not less than 5% potassium oxide (K2O).
The sum of the two nutrients must be not less than 18% by weight. At least 75% of the declared phosphorus pentoxide soluble in mineral acids must be soluble in alkaline ammonium citrate (Joulie). The product must not contain basic slag, calcined phosphate, soft ground rock phosphate, or partially solubilised rock phosphate, and not less than 90% of the aluminium-calcium phosphate should be able to pass through a sieve with a mesh of 0.160 mm.
Phosphorus Pentoxide (P2O)
Amount of phosphorus pentoxide soluble in mineral acids.
P2O5 1.1
P2O5 0.5
Amount of phosphorus pentoxide soluble in water.
Amount of phosphorus pentoxide soluble in mineral acids (after deduction of the amount of phosphorus pentoxide soluble in water).
Amount of phosphorus pentoxide soluble in alkaline ammonium citrate.
As set out in paragraph 7(a) of this Schedule
Potassium Oxide (K2O)
Amount of potassium oxide soluble in water.
K2O 1.1
P2O5
}
++K2O
} 1.5
K2O 0.5
Optional declarations
Amount of chlorine.
Where the chlorine content is not greater than 2% the statement “low in chlorine” may be made.
C1 0.2
PK fertiliser containing soft ground rock phosphate
Product obtained chemically or by blending, without addition of organic nutrients of animal or vegetable origin, containing by weight:—
1 Not less than 5% phosphorus pentoxide (P2O5) of which at least 2% should be soluble only in mineral acids, at least 5% soluble in neutral ammonium citrate and in water and at least 2.5% soluble in water.
2 Not less than 5% potassium oxide (K2O).
Phosphorus Pentoxide (P2O)
Amount of phosphorus pentoxide soluble in mineral acids.
P2O5 1.1
P2O5 0.5
Amount of phosphorus pentoxide soluble in water.
Amount of phosphorus pentoxide soluble in neutral ammonium citrate and water.
Amount of phosphorus pentoxide soluble only in mineral acids.
As set out in paragraph 7(a) of this Schedule
PK fertiliser containing partially solubilised rock phosphate
The sum of the two nutrients must be not less than 18% by weight. Neither product must contain basic slag, Thomas phosphate, Thomas slag, calcined phosphate or aluminium-calcium phosphate. Not less than 90% of the soft ground rock phosphate should be able to pass through a sieve with a mesh of 0.063 mm, and not less than 90% of the partially solubilised rock phosphate should be able to pass through a sieve with a mesh of 0.160 mm.
Potassium Oxide (K2O)
Amount of potassium oxide soluble in water.
K2O 1.1
P2O5
}
++K2O
} 1.5
K2O 0.5
Optional declarations
Amount of chlorine.
Where the chlorine content is not greater than 2% the statement “low in chlorine” may be made.
C1 0.2
PK fertiliser (Phosphate ingredient: aluminium-calcium phosphate only)
Product obtained chemically by blending, without addition of organic nutrients of animal or vegetable origin, containing by weight:—
1 Not less than 5% phosphorus pentoxide (P2O5).
2 Not less than 5% potassium oxide (K2O5).
The sum of the two nutrients must be not less than 18% by weight. At least 75% of the declared phosphorus pentoxide soluble in mineral acids must be soluble in alkaline ammonium citrate (Joulie). The product must not contain any phosphate material other than aluminium-calcium phosphate and not less than 90% of the aluminium-calcium phosphate should be able to pass through a sieve with a mesh of 0.160 mm.
Phosphorus Pentoxide (P2O)
Amount of phosphorus pentoxide soluble in mineral acids.
P2O5 1.1
P2O5 0.5
Amount of phosphorus pentoxide soluble in alkaline ammonium citrate.
As set out in paragraph 7(a) of this Schedule
Potassium Oxide (K2O)
Amount of potassium oxide soluble in water.
K2O 1.1
P2O5
}
++K2O
} 1.5
K2O 0.5
Optional declarations
Amount of chlorine.
Where the chlorine content is not greater than 2% the statement “low in chlorine” may be made.
C1 0.2
PK fertiliser (Phosphate ingredient: calcined phosphate only)
Product obtained chemically or by blending, without addition of organic nutrients of animal or vegetable origin, containing by weight:—
1 Not less than 5% phosphorus pentoxide (P2O5);
2 Not less than 5% potassium oxide (K2O).
The sum of the two nutrients must be not less than 18% by weight. The product must not contain any phosphate material other than calcined phosphate. Not less than 75% of the calcined phosphate should be able to pass through a sieve with a mesh of 0.160 mm.
Phosphorus Pentoxide (P2O)
Amount of phosphorus pentoxide soluble in alkaline ammonium citrate*.
P2O5 1.1
P2O5 0.5
Potassium Oxide (K2O)
Amount of potassium oxide soluble in water.
K2O 1.1
P2O5
}
++K2O
} 1.5
K2O 0.5
Optional declarations
Amount of chlorine.
Where the chlorine content is not greater than 2% the statement “low in chlorine” may be made.
C1 0.2
PK fertiliser (Phosphate ingredient: soft ground rock phosphate only)
Product obtained chemically or by blending, without addition of organic nutrients of animal or vegetable origin, containing by weight:—
1 Not less than 5% phosphorus pentoxide (P2O5);
2 Not less than 5% potassium oxide (K2O).
The sum of the two nutrients must be not less than 18% by weight. At least 55% of the declared phosphorus pentoxide soluble in mineral acids must be soluble in 2% formic acid. The product must not contain any phosphate material other than soft ground rock phosphate. Not less than 90% of the soft ground rock phosphate should be able to pass through a sieve with a mesh of 0.063 mm.
Phosphorus Pentoxide (P2O)
Amount of phosphorus pentoxide soluble in mineral acids.
P2O5 1.1
P2O5 0.5
Amount of phosphorus pentoxide soluble in 2% formic acid.
As set out in paragraph 7(a) of this Schedule.
Potassium Oxide (K2O)
Amount of potassium oxide soluble in water.
K2O 1.1
P2O5
}
++K2O
} 1.5
K2O 0.5
Optional declarations
Amount of chlorine.
Where the chlorine content is not greater than 2% the statement “low in chlorine” may be made.
C1 0.2
PK fertiliser (Phosphate ingredient: basic slag only)
PK fertiliser (Phosphate ingredient: Thomas phosphate only)
PK fertiliser (Phosphate ingredient: Thomas slag only)
Product obtained chemically or by blending, without addition of organic nutrients of animal or vegetable origin, containing by weight:—
1 Not less than 5% phosphorus pentoxide (P2O5);
2 Not less than 5% potassium oxide (K2O).
The sum of the two nutrients must be not less than 18% by weight. The product must not contain any phosphate material other than basic slag. Thomas phosphate or Thomas slag. Not less than 75% of the basic slag, Thomas phosphate or Thomas slag should be able to pass through a sieve with a mesh of 0.160 mm.
Phosphorus Pentoxide (P2O)
Amount of phosphorus pentoxide soluble in 2% citric acid.
P2O5 1.1
P2O5 0.5
Potassium Oxide (K2O)
Amount of potassium oxide soluble in water.
K2O 1.1
P2O5
}
++K2O
} 1.5
K2O 0.5
Optional declarations
Amount of chlorine.
Where the chlorine content is not greater than 2% the statement “low in chlorine” may be made.
C1 0.2
5
Compound fertiliser
Products not otherwise specified in Groups 1 to 4 of Section B of this table, obtained by mixing materials which together will provide two or more of the main nutrients nitrogen (N), phosphorus pentoxide (P2O5) and potassium oxide (K2O), but excluding materials used for improving soil structure or as growing media and which contain less than 1% each of these nutrients. At least one of the nutrients must be derived from a material mentioned in the second column of Section A of the table.
Nitrogen (N)
Amount of total nitrogen.
N
0.5 (for declarations below 3.5% N)
1.1 (for declarations 3.5% and above)
Amount of ureic nitrogen save that a declaration of 10% or less need not be made.
As set out in paragraph 7(b) of this Schedule.
Phosphorus Pentoxide (P2O5)
Amount of total phosphorus pentoxide.
(for declarations below 5.5% P2O5) and above)
Amount of phosphorus pentoxide soluble in water.
Amount of phosphorus pentoxide insoluble in water.
(for declarations below 5.5% P2P5)
As set out in paragraph 7(a) of this Schedule
K2O
0.5 (for declarations below 5.5% K2O)
1.1 (for declarations 5.5% K2O and above)
Potassium Oxide K2O)
Amount of total potassium oxide.
N+P2O5
1.5
N+K2O
1.5
P2O5+K2O
1.5
N }
+P2O5 }
1.9
+K2O

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Source: https://www.legislation.gov.uk/uksi/1990/887/schedule/1/crossheading/compound-fertilisers (the official version)
Page: https://openlegislation.uk/fertilisers-regulations-1990/schedule-1/crossheading-compound-fertilisers
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.