{
  "url": "https://openlegislation.uk/fertilisers-regulations-1990/schedule-1/crossheading-fluid-fertilisers",
  "json_url": "https://openlegislation.uk/fertilisers-regulations-1990/schedule-1/crossheading-fluid-fertilisers.json",
  "legislation": "uksi/1990/887",
  "legislation_title": "The Fertilisers Regulations 1990",
  "legislation_url": "https://openlegislation.uk/fertilisers-regulations-1990",
  "path": "schedule/1/crossheading/fluid-fertilisers",
  "kind": "crossheading",
  "number": "SECTION C.",
  "heading": "FLUID FERTILISERS",
  "text": "Group\nName of Material\nMeaning\nDeclarations\nLimits of variation (absolute value in % by weight, except where stated)\n(1)\n(2)\n(3)\n(4)\n(5)\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% (N). Nitrogen to be expressed as a 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 weight 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 declarationsWhere the biuret content is less than 0.2% the statement “low in biuret” may be made.\n0.6\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)\nNitrogen fluid fertiliser. In 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 listed in Groups 1(a), 1(b) and 1(c) of Section C of this table.\nAmount of total nitrogen.\nAmount of ureic nitrogen save that a declaration of 10% or less need not be made.\n0.5 (for declarations up to and including 10% N)\n0.8 (for declarations exceeding 10% N and up to and including 15percnt; N)\n1.1 (for declarations exceeding 15% N)\nAs set out in paragraph 7(b) of this Schedule.\n1(e)\nStraight Phosphatic fluid fertilisers named in accordance with regulation 4(3).*\nStraight Phosphatic fluid fertiliser Amount of total phosphorus pentoxide.\n0.9\n1(f)\nPhosphatic 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(e),\nAmount of total phosphorus pentoxide.\nAmount of phosphorus pentoxide soluble in 2% formic acid.\n0.5 (for declarations up to and including 10% P2O5)\n0.8 (for declarations exceeding 10% P2O5)\n1.1 (for declarations exceeding 15% P2O5)\n0.8\n1(g)\nStraight potassic fluid fertilisers named in accordance with Regulation 4(3)*\nStraight potassic fluid fertiliser.\nAmmount 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 exceeding 10% and up to and including 15% K2O)\n1.1 (for declarations exceeding 15% K2O)\nGroup\nName of Material\nMeaning\nDeclarations\nLimits of variation (absolute value in % by weight, except where stated)\n(1)\n(2)\n(3)\n*(4)\n*(5)\n*In the case of non-EEC fertilisers, see paragraph 6 for provisions concerning limits of variation; the declaration of nitrogen shall be that laid down in column 4 for the corresponding class of fertiliser in Section B.\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.\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: Ureic N × 0.026.\nNitrogen (N)\nAmount of total nitrogen.\nN 1.1\nAmount, where equal to or greater than 1% by weight of:\n1 nitric nitrogen,\n2 ammoniacal nitrogen.\n3 ureic nitrogen.\nAs set out in paragraph 7 of this Schedule\nPhosphorus Pentoxide (P2P5)\nAmount of phosphorus pentoxide soluble in water.\nP2O5 1.1\nPotassium Oxide (K2O)\nAmount of potassium oxide soluble in water.\nK2O 1.1\nN+P2O5+K2O 1.9\nOptional declarations\nWhere the biuret content is less than 0.2% the statement “low in biuret” may be made.\nAmount of chlorine.\nWhere the chlorine content is not greater than 2% the statement “low in chlorine” may be made.\nC1 0.2\nNPK fertiliser suspension\nProduct in liquid 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: ureic N × 0.026.\nThe fertilisers must not contain Thomas slag, aluminium calcium phosphate, calcined phosphates, partially solubilised phosphates, or natural phosphates.\nNitrogen (N)\nAmount of total nitrogen.\nN 1.1\nAmount, where equal to or greater than 1% by weight, of:\n1 nitric nitrogen\n2 ammonical nitrogen.\n3 ureic nitrogen.\nAs set out in paragraph 7 of this Schedule\nPhosphorus Pentoxide (P2O5)\nWhere phosphorus pentoxide soluble in water is less than 2%, amount of:—\nP2O5 1.1\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\nPotassium Oxide (K2O)\nAmount of potassium oxide soluble in water.\nK2O 1.1\nOptional declarations\nWhere the biuret content is less than 0.2% the statement “low in biuret” may be made.\nN\n}\n+P2O5\n} 1.9\n+K2\n}\nAmount of chlorine.\nWhere 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)\nNitrogen (N)\nAmount of total nitrogen.\nN 1.1\nAmount, where equal to or greater than 1% by weight, of:\n1 nitric nitrogen\n2 ammoniacal nitrogen\n3 ureic nitrogen\nAs set out in paragraph 7 of this Schedule.\nThe sum of the two nutrients must be not less than 18% by weight.\nThe maximum biuret content is ureic N × 0.026.\nPhosphorus Pentoxide (P2O5)\nAmount of phosphorus pentoxide soluble in water\nOptional Declaration\nWhere the biuret content is less than 0.2% the statement “low in biuret” may be made.\nP2O5 1.1\nN\n}\n+P2O5\n} 1.5\nNP fertiliser suspension\nProduct 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, containing by weight:\n1 not less than 3% nitrogen (N).\n2 not less than 5% phosphorus pentoxide (P2O5).\nNitrogen (N)\nAmount of total nitrogen (N).\nN 1.1\nAmount, where equal to or greater than 1% by weight, of:\n1 nitric nitrogen.\n2 ammoniacal nitrogen.\n3 ureic nitrogen.\nAs set out in paragraph 7 of this Schedule\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(a) of this Schedule.\nGroup\nName of Material\nMeaning\nDeclarations\nLimits of variation (absolute value in % by weight, except where stated)\n(1)\n(2)\n(3)\n*(4)\n*(5)\n*In the case of non-EEC fertilisers, see paragraphs 6(a) and 6(b) for provisions concerning limits of variation; the declaration of nitrogen shall be that laid down in column 4 for the corresponding class of fertiliser in Section B.\nThe sum of the two nutrients must be not less than 18% by weight.\nThe maximum biuret content is ureic N × 0.026.\nThe fertilisers may not contain Thomas slag, aluminium calcium phosphate, calcined phosphates, partially solubilised phosphate or natural phosphates.\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.\nOptional Declaration\nWhere the biuret content is less than 0.2% the statement “low in biuret” may be made.\nP2O5 1.1\nN\n}\n+P2O5\n} 1.5\nNK fertiliser solution\nProduct obtained chemically and by dissolution in water, in a form stable at atmospheric pressure, without addition of organic products 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 be not less than 15%.\nThe maximum biuret content shall be ureic N × 0.026.\nNitrogen (N)\nAmount of total nitrogen.\nN 1.1\nAmount, where equal to or greater than 1% by weight of:\n1 nitric nitrogen\n2 ammoniacal nitrogen\n3 ureic nitrogen.\nAs set out in paragraph 7 of this Schedule.\nPotassium Oxide (K2O)\nAmount of potassium oxide soluble in water.\nK2O 1.1\nN\n}\n+K2O\n} 1.5\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.\nC1 0.2\nNK fertiliser suspension\nProduct 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, 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 be not less than 18% by weight.\nMaximum biuret content: Ureic N × 0.026.\nNitrogen (N)\nAmount of total nitrogen.\nN 1.1\nAmount, where equal to or greater than 1% by weight of:\n1 nitric nitrogen.\n2 ammoniacal nitrogen.\n3 ureic nitrogen.\nAs set out in paragraph 7 of this Schedule\nPotassium Oxide (K2O)\nAmount of potassium oxide soluble in water.\nK2O 1.1\nN\n}\n+K2O\n} 1.5\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.\nC1 0.2\nGroup\nName of Material\nMeaning\nDeclarations\nLimits of variation (absolute value in % by weight, except where stated)\n(1)\n(2)\n(3)\n(4)\n*(5)\n*In the case of non-EEC fertilisers, see paragraphs 6(a) and 6(b) for provisions concerning limits of variation.\nPK fertiliser solution\nProduct obtained chemically and by dissolution 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 be not less than 18% by weight.\nPhosphorus Pentoxide (P2O5)\nAmount of phosphorus pentoxide soluble in water.\nP2O5 1.1\nPotassium Oxide (K2O)\nAmount of potassium oxide soluble in water.\nK2O 1.1\nP2O5\n}\n+K2O5\n} 1.5\nOptional Declarations\nAmount of chlorine\nWhere the chlorine content is not greater than 2% the statement “low in chlorine” may be made.\nC1 0.2\nPK fertiliser suspension\nProduct 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 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 be not 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:—\nAs set out in paragraph 7(a) of this Schedule\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.\nP2O5 1.1\nPotassium Oxide (K2O)\nAmount of water-soluble potassium oxide.\nK2O 1.1\nP2O5\n}\n+P2O\n} 1.5\nOptional Declarations\nAmount of chlorine.\nWhere the chlorine content is not greater than 2% the statement “low in chlorine” may be made.\nC1 0.2",
  "extent": null,
  "status": null,
  "version": "current",
  "annotations": [],
  "outstanding_effects": [],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/uksi/1990/887/schedule/1/crossheading/fluid-fertilisers",
    "retrieved_at": "2026-10-29T15:21:24.289770+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."
}