{
  "url": "https://openlegislation.uk/fertilisers-regulations-1991/schedule-1/crossheading-fluid-fertilisers",
  "json_url": "https://openlegislation.uk/fertilisers-regulations-1991/schedule-1/crossheading-fluid-fertilisers.json",
  "legislation": "uksi/1991/2197",
  "legislation_title": "The Fertilisers Regulations 1991",
  "legislation_url": "https://openlegislation.uk/fertilisers-regulations-1991",
  "path": "schedule/1/crossheading/fluid-fertilisers",
  "kind": "crossheading",
  "number": "SECTION C:",
  "heading": "FLUID FERTILISERS",
  "text": "Group\nName of Material\nMeaning\nDeclaration\nLimits of variation (absolute value in % by weight, except where stated)\n(1)\n(2)\n(3)\n(4)\n(5)\n(6)\n*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.\n1(a)\nNitrogen fertiliser solution\nProduct 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\nAmount of total nitrogen\nAmount, where equal to or greater than 1% by weigh, of:\n1 nitric nitrogen\n2 ammoniacal nitrogen\n3 ureic nitrogen\nOptional declarations\nWhere the biuret content is less than 0.2%, the statement “low in biuret” may be made\n0.6\nAmmonium nitrate-urea fertiliser solution\nProduct 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%\nAmount of total nitrogen\nAmount of nitric nitrogen\nAmount of ammoniacal nitrogen\nAmount of ureic nitrogen\nOptional declarations\nWhere the biuret content is less than 0.2% the statement “low in biuret” may be made\n0.6\nCalcium nitrate solution (may be followed by one of the following indications:\nfor foliar application\nfor making nutrient solutions\nfor ferti-irrigation)\nProduct 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.\nAmount of total nitrogen\nOptional declarations\nAmount of nitric nitrogen\nAmount of ammoniacal nitrogen\n0.6\nAmount of calcium, where a use is stipulated (see column 1)\nOne quarter, up to a limit of 0.9%\nMagnesium nitrate solution.\nProduct 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.\nAmount of:—\nnitric nitrogen;\nmagnesium oxide soluble in water.\nCalcium nitrate suspension (may be followed by one of the following indications:\nfor foliar application\nfor making nutrient solutions and suspensions\nfor fertigation).\nProduct 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.\nAmount of total nitrogen;\nAmount of nitric nitrogen;\nAmount of calcium oxide soluble in water.\n0.4\nAs set out in paragraph 7(a) of this Schedule\n0.9.\nNitrogen fertiliser solution with urea formaldehyde.\nProduct 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.\nAmount of:\ntotal nitrogen;\nAmount, where equal to or greater than 1% by weight of:\n1.nitric nitrogen\n2.ammoniacal nitrogen\n3.ureic nitrogen;\nnitrogen from urea formaldehyde.\n0.4\nAs set out in paragraph 7(a) of this Schedule.\nNitrogen fertiliser suspension with urea formaldehyde.\nProduct 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.\nAmount of:\ntotal nitrogen;\nAmount, where equal to or greater than 1% by weight of:\n1.nitric nitrogen\n2.ammoniacal nitrogen\n3.ureic nitrogen;\nnitrogen from urea formaldehyde; nitrogen from urea formaldehyde soluble in cold water; nitrogen from urea formaldehyde soluble only in hot water.\n0.4\nAs set out in paragraph 7(a) of this Schedule.\n1(b)\nAqueous ammonia\nSolution containing ammonia gas dissolved in water, containing not less than 15% ammoniacal nitrogen(N).\nAmount of ammoniacal nitrogen\n0.3\n1(c)\nStraight nitrogenous fluid fertilisers named in accordance with regulation 4(3)\nAny straight nitrogenous fluid fertiliser not otherwise specified in this table.\nAmount of total nitrogen\n0.8\n1(d)\nNitrogenous fluid fertiliser\nProduct 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.\nAmount of total nitrogen\n0.5 (for declarations up to and including 10% N)\n0.8 (for declarations exceeding 10% N and up to and including 15% N)\n1.1 (for declarations exceeding 15% N)\nIn addition the source materials shall be indicated in parentheses in descending order of nutrient contribution\nAmount of ureic nitrogen save that a declaration of 10% or less need not be made\nAs set out in paragraph 7(b) of this schedule\n1(e)\nStraight Phosphatic fluid fertilixsers named in accordance with regulation 4(3)\nStraight Phosphatic fluid fertiliser.\nAmount of total phosphorus pentoxide\n0.9\n1(f)\nPhosphatic fluid fertiliser\nProduct obtained by mixing or blending two or more of the fertilisers at Group 1(e).\nAmount of total phosphorus pentoxide\n0.5 (for declarations up to and including 10% P2O5)\n0.8 (for declarations exceeding 10% P2O5 and up to and including 15% P2O5)\n1.1 (for declarations exceeding 15% P2O5)\nIn addition the source materials shall be indicated in parentheses in descending order of nutrient contribution\nAmount of phosphorus pentoxide soluble in 2% formic acid\n0.8\n1(g)\nStraight potassic fluid fertilisers named in accordance with Regulation 4(3)\nStraight potassic fluid fertiliser.\nAmount of total potassium oxide\n1.0\n1(h)\nPotassic fluid fertiliser\nIn addition the source materials shall be indicated in parentheses in descending order of nutrient contribution\nProduct obtained by mixing or blending two or more of the fertilisers at Group 1(g).\nAmount of total potassium oxide\n0.5 (for declarations up to and including 10% K2O)\n0.8 (for declarations up to and including 10% K2O)\n1.1 (for declarations exceeding 15&:percnt; K2O)\n2.\nNPK fertiliser solution\nProduct 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:\n1 Not less than 2% nitrogen (N)\n2 Not less than 3% phosphorus pentoxide (P2O5)\n3 Not less than 3% potassium oxide (K2O)\nThe sum of the three nutrients must be not less than 15% by weight\nMaximum biuret content: N × 0.026\nNitrogen (N)\nN 1.1\nAs set out in paragraph 7 of this Schedule\nN 0.5\n. . .\n. . .\nAmount of:—\ntotal nitrogen\nAmount of:—\ntotal nitrogen\nAmount where equal to or greater than 1% by weight of:—\n1 nitric nitrogen\n2 ammoniacal nitrogen\n3 ureic nitrogen\n4 cyanamide nitrogen\nAmount of:—\nureic nitrogen, save that a declaration of 10% or less need not be made\nPhosphorus Pentoxide (P2O5)\nAmount of phosphorus pentoxide soluble in water\nP2O5 1.1\nP2O5 0.5\nPotassium Oxide (K2O)\nAmount of potassium oxide soluble in water\nK2O 1.1\nN + P2O5 +K2O 1.9\nK2O 0.5\nOptional declarations\nWhere 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\nCl 0.2\nNPK fertiliser suspension\nProduct 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:\n1 not less than 3% nitrogen (N)\n2 not less than 4% phosphorus pentoxide (P2O5)\n3 not less than 4% potassium oxide (K2O)\nThe sum of the three nutrients must not be less than 20% by weight\nMaximum biuret content: N × 0.026\nThe fertiliser must not contain Thomas slag, aluminium-calcium phosphate, calcined phosphates, partially solubilised phosphates, or natural phosphates.\nNitrogen (N)\nN 1.1\nAs set out in paragraph 7 of this Schedule\nN 0.5\n. . .\n. . .\nAmount of:—\ntotal nitrogen\nAmount of:—\ntotal nitrogen\nAmount where equal to or greater than 1% by weight of:—\n1 nitric nitrogen\n2 ammoniacal nitrogen\n3 ureic nitrogen\n4 cyanamide nitrogen\nAmount of:—\nureic nitrogen, save that a declaration of 18% or less need not be made\nPhosphorus Pentoxide (P2O5)\nWhere phosphorous pentoxide soluble in water is less than 2%, amount of:—\n1 Phosphorus pentoxide soluble in neutral ammonium citrate\nWhere phosphorus pentoxide soluble in water is equal to or greater than 2%, amount of:—\n1 Phosphorus pentoxide soluble in neutral ammonium citrate and in water\n2 Phosphorus pentoxide soluble in water\nAs set out in paragraph 7(a) of this Schedule\nP2O5 1.1\nP2O5 0.5\nPotassium Oxide (K2O)\nAmount of potassium oxide soluble in water\nK2O 1.1\nN + P2O5 + K2O 1.9\nK2O 0.5\nOptional declarations\nWhere the biuret content is less than 0.2% the statement “low in biuret” may be made.\nAmount of chlorine. Where the chlorine content is not greater than 2% the statement “low in chlorine” may be made.\nC1 0.2\nNP fertiliser solution\nProduct 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:\n1 not less than 3% nitrogen (N)\n2 not less than 5% phosphorus pentoxide (P2O5).\nThe sum of the two nutrients must not be less than 18% by weight.\nThe maximum biuret content is ureic N × 0.026.\nNitrogen (N)\nN 1.1\nAs set out in paragraph 7 of this Schedule\nN 0.5\n. . .\n. . .\nAmount of:—\ntotal nitrogen\nAmount of:—\ntotal nitrogen\nAmount where equal to or greater than 1% by weight of:—\n1 nitric nitrogen\n2 ammoniacal nitrogen\n3 ureic nitrogen\n4 cyanamide nitrogen\nAmount of:—\nureic nitrogen, save that a declaration of 10% or less need not be made\nPhosphorus Pentoxide (P2O5)\nAmount of phosphorus pentoxide soluble in water\nP2O5 1.1\nN + P2O5 1.5\nP2O5 0.5\nOptional declaration\nWhere the biuret content is less than 0.2% the statement “low in biuret” may be made\nNP fertiliser suspension\nProduct 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:\n1 not less than 3% nitrogen (N)\n2 not less than 5% phosphorus pentoxide (P2O5)\nThe sum of the two nutrients must not be lass than 18% by weight\nThe maximum biuret content is ureic N × 0.026\nThe fertiliser may not contain Thomas slaag, aluminium calcium phosphate, calcined phosphate, partially solubilised phosphate or natural phosphates\nNitrogen (N)\nN 1.1\nAs set out in paragraph 7 of this Schedule\nN 0.5\n. . .\n. . .\nAmount of:—\ntotal nitrogen\nAmount of:—\ntotal nitrogen\nAmount where equal to or greater than 1% by weight of:—\n1 nitric nitrogen\n2 ammoniacal nitrogen\n3 ureic nitrogen\n4 cyanamide nitrogen\nAmount of:—\nureic nitrogen, save that a declaration of 10% or less need not be made\nPhosphorus Pentoxide (P2O5)\nWhere phosphorus pentoxide soluble in water is less than 2%, amount of:—\n1 Phosphorus pentoxide soluble in neutral ammonium citrate\nAs set out in paragraph 7 of this Schedule\nWhere phosphorus pentoxide soluble in water is equal to or greater than 2% amount of:\n1 Phosphorus pentoxide (P2O5) soluble in neutral ammonium citrate and in water\n2 Phosphorus pentoxide soluble in water\nP2O5 1.1\nP2O5 0.5\nN + P2O5 1.5\nOptional Declaration\nWhere biuret content is less than 0.2% the statement “low in biuret” may be made\nNK Fertiliser solution\nProduct 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:\n1 not less than 3% nitrogen (N)\n2 not less than 5% potasium oxide (K2O)\nThe sum of the two nutrients must not be less than 15%\nThe maximum biuret content shall be ureic N × 0.026\nNitrogen (N)\nN 1.1\nAs set out in paragraph 7 of this Schedule\nN 0.5\n. . .\n. . .\nAmount of:—\ntotal nitrogen\nAmount of:—\ntotal nitrogen\nAmount where equal to or greater than 1% by weight of:—\n1 nitric nitrogen\n2 ammoniacal nitrogen\n3 ureic nitrogen\n4 cyanamide nitrogen\nAmount of:—\nureic nitrogen, save that a declaration of 10% or less need not be made\nPotassium Oxide (K2O)\nAmount of potassium oxide soluble in water\nK2O 1.1\nN + K2O 1.5\nK2O 0.5\nOptional declarations\nAmount of chlorine\nWhere the chlorine content is not greater than 2%, the statement “low in chlorine” may be made\nWhere the biuret content is less tan 0.2%, the statement “low in biuret” may be made\nCl 0.2\nNK fertiliser suspension\nProduct 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:\n1 not less than 3% nitrogen (N)\n2 not less than 5% potassium oxide (K2O)\nThe sum of the two nutrients must not be less than 18% by weight\nThe maximum biuret content shall be urieic N × 0.026\nNitrogen (N)\nN 1.1\nAs set out in paragraph 7 of this Schedule\nN 0.5\n. . .\n. . .\nAmount of:—\ntotal nitrogen\nAmount of:—\ntotal nitrogen\nAmount where equal to or greater than 1% by weight of:—\n1 nitric nitrogen\n2 ammoniacal nitrogen\n3 ureic nitrogen\n4 cyanamide nitrogen\nAmount of:—\nureic nitrogen, save that a declaration of 10% or less need not be made\nPotassium Oxide (K2O)\nAmount of potassium oxide soluble in water\nK2O\nN + K2O 1.5\nK2O 0.5\nOptional declarations\nAmount of chlorine\nWhere the chlorine content is not greater than 2%, the statement “low in chlorine” may be made\nWhere the biuret content is less than 0.2%, the statement “low in biuret” may be made\nCl 0.2\nPK fertiliser solution\nProduct obtained chemically and by dissolution in water, without addition of organic nutrients of animal or vegatable origin, containing by weight:\n1 Not less than 5% phosphorus pentoxide (P2O5)\n2 Not less than 5% potassium oxide (K2O)\nThe sum of the two nutrients must not be less than 18% by weight.\nPhosphorus Pentoxide (P2O5)\nAmount of phosphorus pentoxide soluble in water\nPotassium oxide (K2O)\nAmount of potassium oxide soluble in water\nOptional declarations\nAmount of chlorine\nWhere the chlorine content is not greater than 2% the statement “low in chlorine” may be made\nP2O5 1.1\nK2O 1.1\nP2O5 1.5\n+K2O 1.5\nCl 0.2\nP2O5 0.5\nK2O 0.5\nPK fertiliser suspension\nProduct 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:\n1 Not less than 5% phosphorus pentoxide (P2O5)\n2 Not less than 5% potassium oxide (K2O)\nThe sum of the two nutrients must not be less than 18% by weight.\nThe fertilisers must not contain Thomas slag, aluminium calcium phosphate, calcined phosphates, partially solubilised phosphates or natural phosphates.\nPhosphorus Pentoxide (P2O5)\nWhere phosphorus pentoxide soluble in water is less than 2%, amount of:\n1 Phosphorus pentoxide soluble in neutral ammonium citrate\nWhere phosphorus pentoxide soluble in water is equal to or greater than 2%, amount of:\n1 Phosphorus pentoxide soluble in neutral ammonium citrate and in water\n2 Phosphorus pentoxide soluble in water\nPotassium Oxide (K2O)\nAmount of water-soluble potassium oxide\nOptional declarations\nAmount of chlorine\nWhere the chlorine content is not greater than 2% the statement “low in chlorine” may be made\nAs set out in paragraph 7 of this Schedule\nP2O5 1.1\nK2O 1.1\nP2O5 1.5\n+K2O 1.5\nCl 0.2\nP2O5 0.5\nK2O 0.5\n3\nCompound fluid fertiliser\nProducts 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.\nNitrogen (N)\nAmount of total nitrogen\nAmount of ureic nitrogen save that a declaration of 10% or less need not be made\nPhosphorus Pentoxide (P2O5)\nAmount of total phosphorus pentoxide\nAmount of phosphorus pentoxide soluble in water\nN 0.5 (for declarations below 3.5% N)\nN 1.1 (for declarations 3.5% N and above)\nAs set out in paragraph 7(b) of this Schedule\nP2O5 0.5 (for declarations below 5.5% P2O5)\nP2O5 1.1 (for declarations 5.5% P2O5 and above\nAs set out in paragraph 7(a) of this Schedule\n4\nCompound fluid fertiliser not containing any material mentioned in the second column of Group 1 of Section C of this table\nProducts 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.\nPotassium Oxide (K2O)\nAmount of total potassium oxide\nK2O 0.5 (for declarations below 5.5% K2O)\nK2O 1.1 (for declarations 5.5% K2O and above)\nN + P2O5 1.5 for products containing two nutrients only\nN + K2O 1.5 for products containing two nutrients only\nP2O5+K2O 1.5 for products containing two nutrients only\nNone of the nutrients may be derived from a material mentioned in the second column of Group 1 of this Section of this table.\nN 1.9\n+P2O5 1.9\n+k2O 1.9",
  "extent": "E+W+S",
  "status": null,
  "version": "current",
  "annotations": [
    {
      "type": "F",
      "label": "F1",
      "text": "Words in Sch. 1 inserted (30.1.1995) by The Fertilisers (Amendment) Regulations 1995 (S.I. 1995/16), regs. 1(1), 4(c)(i)"
    },
    {
      "type": "F",
      "label": "F2",
      "text": "Words in Sch. 1 inserted (1.1.1999) by The Fertilisers (Amendment) Regulations 1998 (S.I. 1998/2024), reg. 1(1)(b), Sch. 2"
    },
    {
      "type": "F",
      "label": "F3",
      "text": "Words in Sch. 1 substituted (30.1.1995) by The Fertilisers (Amendment) Regulations 1995 (S.I. 1995/16), regs. 1(1), 4(c)(ii), Sch. 5"
    },
    {
      "type": "F",
      "label": "F4",
      "text": "Words in Sch. 1 omitted (15.3.2019) by virtue of The Fertilisers and Ammonium Nitrate Material (Amendment) (EU Exit) Regulations 2019 (S.I. 2019/601), regs. 1(2), 2(13)(a)"
    },
    {
      "type": "F",
      "label": "F5",
      "text": "Words in Sch. 1 omitted (15.3.2019) by virtue of The Fertilisers and Ammonium Nitrate Material (Amendment) (EU Exit) Regulations 2019 (S.I. 2019/601), regs. 1(2), 2(13)(b)"
    },
    {
      "type": "footnote",
      "label": "f1",
      "text": "*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."
    }
  ],
  "outstanding_effects": [],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/uksi/1991/2197/schedule/1/crossheading/fluid-fertilisers",
    "retrieved_at": "2026-10-29T14:37:20.267878+00:00"
  },
  "licence": "Open Government Licence v3.0",
  "licence_url": "https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/",
  "attribution": "Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives."
}