# The Fertilisers Regulations 1991, FLUID FERTILISERS

Extent: E+W+S

Group
Name of Material
Meaning
Declaration
Limits of variation (absolute value in % by weight, except where stated)
(1)
(2)
(3)
(4)
(5)
(6)
*This is only an indication of how the material should be named and accordingly this form of words should not be used in the statutory statement.
1(a)
Nitrogen fertiliser solution
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, containing by weight not less than 15% nitrogen (N). Nitrogen to be expressed as total nitrogen or, if there is only one form, nitric nitrogen or ammoniacal nitrogen or ureic nitrogen. The maximum biuret content to be ureic N × 0.026
Amount of total nitrogen
Amount, where equal to or greater than 1% by weigh, of:
1 nitric nitrogen
2 ammoniacal nitrogen
3 ureic nitrogen
Optional declarations
Where the biuret content is less than 0.2%, the statement “low in biuret” may be made
0.6
Ammonium nitrate-urea fertiliser solution
Product obtained chemically and by dissolution in water, with ammonium nitrate and urea as essential ingredients, containing by weight not less than 26% nitrogen (N). Nitrogen expressed as total nitrogen, where the ureic nitrogen accounts for about half of the nitrogen present. The maximum biuret content to be 0.5%
Amount of total nitrogen
Amount of nitric nitrogen
Amount of ammoniacal nitrogen
Amount of ureic nitrogen
Optional declarations
Where the biuret content is less than 0.2% the statement “low in biuret” may be made
0.6
Calcium nitrate solution (may be followed by one of the following indications:
for foliar application
for making nutrient solutions
for ferti-irrigation)
Product obtained by dissolving calcium nitrate in water and containing not less than 8% nitrogen (N). Nitrogen expressed as nitric nitrogen with a maximum 1% ammoniacal nitrogen.
Amount of total nitrogen
Optional declarations
Amount of nitric nitrogen
Amount of ammoniacal nitrogen
0.6
Amount of calcium, where a use is stipulated (see column 1)
One quarter, up to a limit of 0.9%
Magnesium nitrate solution.
Product obtained chemically and by dissolving magnesium nitrate in water and containing not less than 6% nitrogen (N) and 9% magnesium oxide (MgO). The pH should be not less than 4.
Amount of:—
nitric nitrogen;
magnesium oxide soluble in water.
Calcium nitrate suspension (may be followed by one of the following indications:
for foliar application
for making nutrient solutions and suspensions
for fertigation).
Product obtained by suspension of calcium nitrate in water and containing not less than 8% nitrogen (N), where N is expressed as total nitrogen or as nitric and ammoniacal nitrogen, with a maximum content of 1% ammoniacal nitrogen. Not less than 14% CaO. Calcium expressed as water soluble CaO.
Amount of total nitrogen;
Amount of nitric nitrogen;
Amount of calcium oxide soluble in water.
0.4
As set out in paragraph 7(a) of this Schedule
0.9.
Nitrogen fertiliser solution with urea formaldehyde.
Product obtained chemically or by dissolution in water of urea formaldehyde and a nitrogenous fertiliser from group 1(a) in Section A of this Schedule (excluding calcium cyanamide, nitrogenous calcium cyanamide, ammonium nitrate and calcium ammonium nitrate) and containing not less than 18% nitrogen (N). At least one third of the declared total nitrogen content must derive from urea formaldehyde. The maximum biuret content to be (ureic N+urea formaldehyde N)×0.026.
Amount of:
total nitrogen;
Amount, where equal to or greater than 1% by weight of:
1.nitric nitrogen
2.ammoniacal nitrogen
3.ureic nitrogen;
nitrogen from urea formaldehyde.
0.4
As set out in paragraph 7(a) of this Schedule.
Nitrogen fertiliser suspension with urea formaldehyde.
Product obtained chemically or by suspension in water of urea formaldehyde and a nitrogenous fertiliser from group 1(a) in Section A of this Schedule (excluding calcium cyanamide, nitrogenous calcium cyanamide, ammonium nitrate and calcium ammonium nitrate) and containing not less than 18% nitrogen (N). At least one third of the declared total nitrogen content must derive from urea formaldehyde of which at least three fifths must be soluble in hot water. The maximum biuret content to be (ureic+urea formaldehyde N)×0.026.
Amount of:
total nitrogen;
Amount, where equal to or greater than 1% by weight of:
1.nitric nitrogen
2.ammoniacal nitrogen
3.ureic nitrogen;
nitrogen from urea formaldehyde; nitrogen from urea formaldehyde soluble in cold water; nitrogen from urea formaldehyde soluble only in hot water.
0.4
As set out in paragraph 7(a) of this Schedule.
1(b)
Aqueous ammonia
Solution containing ammonia gas dissolved in water, containing not less than 15% ammoniacal nitrogen(N).
Amount of ammoniacal nitrogen
0.3
1(c)
Straight nitrogenous fluid fertilisers named in accordance with regulation 4(3)
Any straight nitrogenous fluid fertiliser not otherwise specified in this table.
Amount of total nitrogen
0.8
1(d)
Nitrogenous fluid fertiliser
Product obtained by mixing or blending two or more of the fertilisers listed in Groups 1(a), 1(b) and 1(c) of Section C of this table.
Amount of total nitrogen
0.5 (for declarations up to and including 10% N)
0.8 (for declarations exceeding 10% N and up to and including 15% N)
1.1 (for declarations exceeding 15% N)
In addition the source materials shall be indicated in parentheses in descending order of nutrient contribution
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
1(e)
Straight Phosphatic fluid fertilixsers named in accordance with regulation 4(3)
Straight Phosphatic fluid fertiliser.
Amount of total phosphorus pentoxide
0.9
1(f)
Phosphatic fluid fertiliser
Product obtained by mixing or blending two or more of the fertilisers at Group 1(e).
Amount of total phosphorus pentoxide
0.5 (for declarations up to and including 10% P2O5)
0.8 (for declarations exceeding 10% P2O5 and up to and including 15% P2O5)
1.1 (for declarations exceeding 15% P2O5)
In addition the source materials shall be indicated in parentheses in descending order of nutrient contribution
Amount of phosphorus pentoxide soluble in 2% formic acid
0.8
1(g)
Straight potassic fluid fertilisers named in accordance with Regulation 4(3)
Straight potassic fluid fertiliser.
Amount of total potassium oxide
1.0
1(h)
Potassic fluid fertiliser
In addition the source materials shall be indicated in parentheses in descending order of nutrient contribution
Product obtained by mixing or blending two or more of the fertilisers at Group 1(g).
Amount of total potassium oxide
0.5 (for declarations up to and including 10% K2O)
0.8 (for declarations up to and including 10% K2O)
1.1 (for declarations exceeding 15&:percnt; K2O)
2.
NPK fertiliser solution
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, containing by weight:
1 Not less than 2% nitrogen (N)
2 Not less than 3% phosphorus pentoxide (P2O5)
3 Not less than 3% potassium oxide (K2O)
The sum of the three nutrients must be not less than 15% by weight
Maximum biuret content: N × 0.026
Nitrogen (N)
N 1.1
As set out in paragraph 7 of this Schedule
N 0.5
. . .
. . .
Amount of:—
total nitrogen
Amount of:—
total nitrogen
Amount where equal to or greater than 1% by weight of:—
1 nitric nitrogen
2 ammoniacal nitrogen
3 ureic nitrogen
4 cyanamide nitrogen
Amount of:—
ureic nitrogen, save that a declaration of 10% or less need not be made
Phosphorus Pentoxide (P2O5)
Amount of phosphorus pentoxide soluble in water
P2O5 1.1
P2O5 0.5
Potassium Oxide (K2O)
Amount of potassium oxide soluble in water
K2O 1.1
N + P2O5 +K2O 1.9
K2O 0.5
Optional declarations
Where the biuret content is less than 0.2% the statement “low in buret” may be made. 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 suspension
Product in fluid form, in which the nutrients are derived from substances both in suspension in water and in solution without addition of organic nutrients of animal or vegetable origin, containing by weight:
1 not less than 3% nitrogen (N)
2 not less than 4% phosphorus pentoxide (P2O5)
3 not less than 4% potassium oxide (K2O)
The sum of the three nutrients must not be less than 20% by weight
Maximum biuret content: N × 0.026
The fertiliser must not contain Thomas slag, aluminium-calcium phosphate, calcined phosphates, partially solubilised phosphates, or natural phosphates.
Nitrogen (N)
N 1.1
As set out in paragraph 7 of this Schedule
N 0.5
. . .
. . .
Amount of:—
total nitrogen
Amount of:—
total nitrogen
Amount where equal to or greater than 1% by weight of:—
1 nitric nitrogen
2 ammoniacal nitrogen
3 ureic nitrogen
4 cyanamide nitrogen
Amount of:—
ureic nitrogen, save that a declaration of 18% or less need not be made
Phosphorus Pentoxide (P2O5)
Where phosphorous 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
As set out in paragraph 7(a) of this Schedule
P2O5 1.1
P2O5 0.5
Potassium Oxide (K2O)
Amount of potassium oxide soluble in water
K2O 1.1
N + P2O5 + K2O 1.9
K2O 0.5
Optional declarations
Where the biuret content is less than 0.2% the statement “low in biuret” may be made.
Amount of chlorine. Where the chlorine content is not greater than 2% the statement “low in chlorine” may be made.
C1 0.2
NP fertiliser solution
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, 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 not be less than 18% by weight.
The maximum biuret content is ureic N × 0.026.
Nitrogen (N)
N 1.1
As set out in paragraph 7 of this Schedule
N 0.5
. . .
. . .
Amount of:—
total nitrogen
Amount of:—
total nitrogen
Amount where equal to or greater than 1% by weight of:—
1 nitric nitrogen
2 ammoniacal nitrogen
3 ureic nitrogen
4 cyanamide nitrogen
Amount of:—
ureic nitrogen, save that a declaration of 10% or less need not be made
Phosphorus Pentoxide (P2O5)
Amount of phosphorus pentoxide soluble in water
P2O5 1.1
N + P2O5 1.5
P2O5 0.5
Optional declaration
Where the biuret content is less than 0.2% the statement “low in biuret” may be made
NP fertiliser suspension
Product in fluid 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, 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 not be lass than 18% by weight
The maximum biuret content is ureic N × 0.026
The fertiliser may not contain Thomas slaag, aluminium calcium phosphate, calcined phosphate, partially solubilised phosphate or natural phosphates
Nitrogen (N)
N 1.1
As set out in paragraph 7 of this Schedule
N 0.5
. . .
. . .
Amount of:—
total nitrogen
Amount of:—
total nitrogen
Amount where equal to or greater than 1% by weight of:—
1 nitric nitrogen
2 ammoniacal nitrogen
3 ureic nitrogen
4 cyanamide nitrogen
Amount of:—
ureic nitrogen, save that a declaration of 10% or less need not be made
Phosphorus Pentoxide (P2O5)
Where phosphorus pentoxide soluble in water is less than 2%, amount of:—
1 Phosphorus pentoxide soluble in neutral ammonium citrate
As set out in paragraph 7 of this Schedule
Where phosphorus pentoxide soluble in water is equal to or greater than 2% amount of:
1 Phosphorus pentoxide (P2O5) soluble in neutral ammonium citrate and in water
2 Phosphorus pentoxide soluble in water
P2O5 1.1
P2O5 0.5
N + P2O5 1.5
Optional Declaration
Where biuret content is less than 0.2% the statement “low in biuret” may be made
NK Fertiliser solution
Product obtained chemically and by dissolution in water, in a form stable at atmospheric pressure, without addition of organic products on animal or vegetable origin, containing by weight:
1 not less than 3% nitrogen (N)
2 not less than 5% potasium oxide (K2O)
The sum of the two nutrients must not be less than 15%
The maximum biuret content shall be ureic N × 0.026
Nitrogen (N)
N 1.1
As set out in paragraph 7 of this Schedule
N 0.5
. . .
. . .
Amount of:—
total nitrogen
Amount of:—
total nitrogen
Amount where equal to or greater than 1% by weight of:—
1 nitric nitrogen
2 ammoniacal nitrogen
3 ureic nitrogen
4 cyanamide nitrogen
Amount of:—
ureic nitrogen, save that a declaration of 10% or less need not be made
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
Where the biuret content is less tan 0.2%, the statement “low in biuret” may be made
Cl 0.2
NK fertiliser suspension
Product in fluid 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, 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 not be less than 18% by weight
The maximum biuret content shall be urieic N × 0.026
Nitrogen (N)
N 1.1
As set out in paragraph 7 of this Schedule
N 0.5
. . .
. . .
Amount of:—
total nitrogen
Amount of:—
total nitrogen
Amount where equal to or greater than 1% by weight of:—
1 nitric nitrogen
2 ammoniacal nitrogen
3 ureic nitrogen
4 cyanamide nitrogen
Amount of:—
ureic nitrogen, save that a declaration of 10% or less need not be made
Potassium Oxide (K2O)
Amount of potassium oxide soluble in water
K2O
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
Where the biuret content is less than 0.2%, the statement “low in biuret” may be made
Cl 0.2
PK fertiliser solution
Product obtained chemically and by dissolution in water, without addition of organic nutrients of animal or vegatable 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 not be less than 18% by weight.
Phosphorus Pentoxide (P2O5)
Amount of phosphorus pentoxide soluble in water
Potassium oxide (K2O)
Amount of potassium oxide soluble in water
Optional declarations
Amount of chlorine
Where the chlorine content is not greater than 2% the statement “low in chlorine” may be made
P2O5 1.1
K2O 1.1
P2O5 1.5
+K2O 1.5
Cl 0.2
P2O5 0.5
K2O 0.5
PK fertiliser suspension
Product in fluid 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 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 not be less than 18% by weight.
The fertilisers must not contain Thomas slag, aluminium calcium phosphate, calcined phosphates, partially solubilised phosphates or natural phosphates.
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
Potassium Oxide (K2O)
Amount of water-soluble potassium oxide
Optional declarations
Amount of chlorine
Where the chlorine content is not greater than 2% the statement “low in chlorine” may be made
As set out in paragraph 7 of this Schedule
P2O5 1.1
K2O 1.1
P2O5 1.5
+K2O 1.5
Cl 0.2
P2O5 0.5
K2O 0.5
3
Compound fluid fertiliser
Products not otherwise specified in this Section of this table, obtained by mixing or blending materials to provide either two or three of the major nutrients nitrogen (N), phosporus pentoxide (P2O5) and potassium oxide (K2O). Excluded are any materials sold or offered for sale for improving soil structure or as growing media, which contain less than 1% of each of these nutrients. At least one of these nutrients must be derived from a material in the second column of Group 1 of Section C of this table.
Nitrogen (N)
Amount of total nitrogen
Amount of ureic nitrogen save that a declaration of 10% or less need not be made
Phosphorus Pentoxide (P2O5)
Amount of total phosphorus pentoxide
Amount of phosphorus pentoxide soluble in water
N 0.5 (for declarations below 3.5% N)
N 1.1 (for declarations 3.5% N and above)
As set out in paragraph 7(b) of this Schedule
P2O5 0.5 (for declarations below 5.5% P2O5)
P2O5 1.1 (for declarations 5.5% P2O5 and above
As set out in paragraph 7(a) of this Schedule
4
Compound fluid fertiliser not containing any material mentioned in the second column of Group 1 of Section C of this table
Products not otherwise specified in this Section of this table, including those products obtained by mixing or blending materials to provide either two or three of the major nutrients nitrogen (N), phosphorus pentoxide (P2O5) and potassium oxide (K2O). Excluded are any materials sold or offered for sale for improving soil structure or as growing media, which contain less than 1% of these nutrients.
Potassium Oxide (K2O)
Amount of total potassium oxide
K2O 0.5 (for declarations below 5.5% K2O)
K2O 1.1 (for declarations 5.5% K2O and above)
N + P2O5 1.5 for products containing two nutrients only
N + K2O 1.5 for products containing two nutrients only
P2O5+K2O 1.5 for products containing two nutrients only
None of the nutrients may be derived from a material mentioned in the second column of Group 1 of this Section of this table.
N 1.9
+P2O5 1.9
+k2O 1.9

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Source: https://www.legislation.gov.uk/uksi/1991/2197/schedule/1/crossheading/fluid-fertilisers (the official version)
Page: https://openlegislation.uk/fertilisers-regulations-1991/schedule-1/crossheading-fluid-fertilisers
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.