{
  "url": "https://openlegislation.uk/fertilisers-regulations-1991/schedule-1/crossheading-compound-fertilisers",
  "json_url": "https://openlegislation.uk/fertilisers-regulations-1991/schedule-1/crossheading-compound-fertilisers.json",
  "legislation": "uksi/1991/2197",
  "legislation_title": "The Fertilisers Regulations 1991",
  "legislation_url": "https://openlegislation.uk/fertilisers-regulations-1991",
  "path": "schedule/1/crossheading/compound-fertilisers",
  "kind": "crossheading",
  "number": "SECTION B:",
  "heading": "COMPOUND FERTILISERS",
  "text": "Group\nName of Material\nMeaning\nDeclarations\nLimits of variation (absolute value in percnetage by weight, except where otherwise specified)\n(1)\n(2)\n(3)\n(4)\n(5)\n(6)\n*As determined by the Petermann method.\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\nNPK fertiliser\nProduct obtained chemically or by blending, 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);\n3 Not less than 5% potassium oxide (K2O).\nThe 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.\nThe P2O5 content soluble only in mineral acids must not exceed 2%.\nNitrogen (N)\n...\nFertiliser\n. . .\nAmount of total nitrogen\n. . .\nAmount of ureic nitrogen save that a declaration of 10% or less need not be made\nN 1.1\nAs set out in paragraph 7 of this Schedule\nN 0.5\n. . .\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\nP2O5 1.1\nP2O5 0.5\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\nN 1.9\n+P2O5 1.9\n+K2O 1.9\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\nCl 0.2\nNPK fertiliser containing aluminium-calcium phosphate\nProduct obtained chemically or by blending, without addition of organic nutrients of animal or vegetable origin, containing by weight:–\n1 Not less than 3% nigrogen (N);\n2 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; and\n3 Not less than 5% potassium oxide (K2O).\nNitrogen (N)\n...\nFertiliser\n. . .\nAmount of total nitrogen\n. . .\nAmount of ureic nitrogen save that a declaration of 10% or less need not be made\nN 1.1\nAs set out in paragraph 7 of this Schedule\nN 0.5\n. . .\nThe 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 (Joule). 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.\nPhosphorus Pentoxide (P2O5)\nAmount of phosphorus pentoxide soluble in mineral acids\nP2O5 1.1\nP2O5 0.5\nAmount of phosphorus pentoxide soluble in water\nAs set out in paragraph 7(a) of this Schedule\nAmount of phosphorus pentoxide soluble in mineral acids (after deduction of the amount of phosphorus pentoxide soluble in water)\nAs set out in paragraph 7(a) of this Schedule\nAmount of phosphorus pentoxide soluble in alkaline ammonium citrate\nAs set out in paragraph 7(a) of this Schedule\nPotassium Oxide (K2O)\nK2 1.1\nK2O 0.5\nAmount of potassium oxide soluble in water\nN 1.9\n+P2O5 1.9\n+K2O 1.9\nOptional declarations\nAmount of chlorine\nCl 0.2\nWhere the chlorine content is not greater than 2% the statement “low in chlorine” may be made\nNPK fertiliser containing soft ground rock phosphate\nNPK fertiliser containing partially solubilised rock phosphate\nProduct obtained chemically or by blending, without addition of organic nutrients of animal or vegetable origin, containing by weight:–\n1 Not less than 3% nigrogen (N);\n2 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;\n3 Not less than 5% potassium oxide (K2O).\nThe 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 0.063 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.\nNitrogen (N)\n...\nFertiliser\n. . .\nAmount of total nitrogen\n. . .\nAmount of ureic nitrogen save that a declaration of 10% or less need not be made\nN 1.1\nAs set out in paragraph 7 of this Schedule\nN 0.5\n. . .\nPhosphorus Pentoxide (P2O5)\nAmount of phosphorus pentoxide soluble in mineral acids\nP2O5 1.1\nP2O5 0.5\nAmount of phosphorus pentoxide soluble in water\nAmount of phosphorus pentoxide soluble in neutral ammonium citrate and in water\nAs set out in paragraph 7(a) of this Schedule\nAmount of phosphorus pentoxide soluble only in mineral acids\nAs set out in paragraph 7(a) of this Schedule\nK2O 0.5\nPotassium Oxide (K2O)\nAmount of potassium oxide soluble in water\nK2O 1.1\nN 1.9\n+p2O5 1.9\n+K2O 1.9\nOptional declarations\nAmount of chlorine\nWhere the chlorine content is not greater than 2% the statement “low in chlorine” may be made\nCl 0.2\nNPK fertiliser (Phosphate ingredient, aluminium-calcium phosphate only)\nProduct obtained chemically or by blending, 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);\n3 Not less than 5% potassium oxide (K2O)\nNitrogen (N)\n...\nFertiliser\n. . .\nAmount of total nitrogen\n. . .\nAmount of ureic nitrogen save that a declaration of 10% or less need not be made\nN 1.1\nAs set out in paragraph 7 of this Schedule\nN 0.5\nThe sum of the three nutrients must be not less than 20% by weight. At least 75% of the declared phsophorus pentoxide soluble in mineral acids must be soluble in alkaline ammonium citrate (Joule). 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.\n. . .\nPhosphorus Pentoxide (P2O5)\nAmount of phosphorus pentoxide soluble in mineral acids\nP2O5 1.1\nP2O5 0.5\nAmount of phosphorus pentoxide soluble in alkaline ammonium citrate\nAs set out in paragraph 7(a) of this Schedule\nPotassium Oxide (K2O)\nAmount of potassium oxide soluble in water\nK2O 1.1\nN 1.9\n+P2O5 1.9\n+K2O 1.9\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\nCl 0.2\nNPK fertiliser (Phosphate ingredient, calcined phosphate only)\nProduct obtained chemically or by blending, without addition of organic nutrient of animal or vegatable origin, containing by weight:–\n1 Not less than 3% nitrogen (N);\n2 Not less t;han 5% phosphorus pentoxide (P2O5);\n3 Not less than 5% potassium oxide (K2O).\nThe sum of the three nutrients must be not less than 20% by weight. The product must not contain any phposphate 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.\nNitrogen (N)\n...\nFertiliser\n. . .\nAmount of total nitrogen\n. . .\nAmount of ureic nitrogen save that a declaration of 10% or less need not be made\nN 1.1\nAs set out in paragraph 7 of this Schedule\nN 0.5\n. . .\nPhosphorus Pentoxide (P2O5)\nAmount of phosphorus pentoxide soluble in alkaline ammonium citrate\nP2O5 1.1\nP2O5 0.5\nPotassium Oxide (K2O)\nAmount of potassium oxide soluble in water\nK2O 1.1\nN 1.9\n+P2 1.9\n+K2O 1.9\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”.\nCl 0.2\nNPK fertiliser (Phosphate ingredient, soft ground rock phosphate only)\nProduct obtained chemically or by blending, 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);\n3 Not less than 5% potassium oxide (K2O).\nThe 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.\nNitrogen (N)\n...\nFertiliser\n. . .\nAmount of total nitrogen\n. . .\nAmount of ureic nitrogen save that a declaration of 10% or less need not be made\nN 1.1\nAs set out in paragraph 7 of this Schedule\nN 0.5\n. . .\nPhosphorus Pentoxide (P2O5)\nAmount of phosphorus pentoxide soluble in mineral acids\nP2O5 1.1\nP2O5 0.5\nAmount of phosphorus pentoxide soluble in 2% formic acid\nAs set out in parabraph 7(a) of this Schedule\nPotassium Oxide (K2O)\nAmount of potassium oxide soluble in water\nK2O 1.1\nN 1.9\n+P2 1.9\n+K2O 1.9\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”.\nCl 0.2\nNPK fertiliser (Phosphate ingredient: basic slag only)\nNPK fertiliser (Phosphate ingredient; Thomas phosphate only)\nNPK fertiliser (Phosphate ingredient; Thomas slag only)\nProduct obtained chemically or by blending, 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);\n3 Not less than 5% potassium oxide (K2O).\nThe 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.\nNot 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.\nNitrogen (N)\n...\nFertiliser\n. . .\nAmount of total nitrogen\n. . .\nAmount of ureic nitrogen save that a declaration of 10% or less need not be made\nN 1.1\nAs set out in paragraph 7 of this Schedule\nN 0.5\n. . .\nPhosphorus Pentoxide (P2O5)\nAmount of phosphorus pentoxide soluble in 2% citric acid\nP2O5 1.1\nP2O5 0.5\nPotassium Oxide (K2O)\nAmount of potassium oxide soluble in water\nK2O 1.1\nN 1.9\n+P2 1.9\n+K2O 1.9\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”.\nCl 0.2\nNPK fertilisers containing crotonylidene diurea or isobutylidene diurea or urea formaldehyde (as appropriate)\nProduct obtained chemically without addition of organic nutrients of animal or vegetable origin and containing crotonylidene diurea or isobutylidene diurea or urea formaldehyde.\nContaining by weight:\n1 not less than 5% nitrogen (N)\n2 not less than 5% phosphorus pentoxide (P2O5)\n3 not less than 5% potassium oxide (K2O).\nThe sum of the three nutrients must not be less than 20%.\nAt least 25% of the declared content of total nitrogen must derive from crotonylidene diurea, or isobutylidene diurea or urea formaldehyde.\nAt least 60% of the declared nitrogen content from urea formaldehyde must be soluble in hot water.\nThe product must not contain Thomas slag, calcined phosphate, aluminium-calcium phosphate, partially solubilised natural phosphate or natural phosphate.\nThe P2O5 content soluble only in mineral acids must not exceed 2%\nNitrogen (N)\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, where appropriate, from\n1 crotonylidene diurea or\n2 isobutylidene diurea or\n3 urea formaldehyde;\nnitrogen from urea formaldehyde that is only soluble in hot water;\nnitrogen from urea formaldehyde that is soluble in cold water\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 potassium 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\n2\nNP fertiliser\nProduct obtained chemically or by blending, 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 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.\nThe P2O5 content soluble only in mineral acids must not exceed 2%.\nNitrogen (N)\n...\nFertiliser\n. . .\nAmount of total nitrogen\n. . .\nAmount of ureic nitrogen save that a declaration of 10% or less need not be made\nN 1.1\nAs set out in paragraph 7 of this Schedule\nN 0.5\n. . .\nPhosphorus Pentoxide (P2O5)\nWhere phosphorus pentixide 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\nP2O5 1.1\nP2O5 0.5\n2 Phosphorus pentoxide soluble in water\nAs set out in paragraph 7(a) of this Schedule\nN 1.5\n+P2O5 1.5\nNP fertiliser containing aluminium-calcium phosphate\nProduct obtained chemically or by blending, 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) of which at least 2% must be soluble in water, and at least 5% soluble in mineral acids.\nThe 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 (Joule). 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.\nNitrogen (N)\n...\nFertiliser\n. . .\nAmount of total nitrogen\n. . .\nAmount of ureic nitrogen save that a declaration of 10% or less need not be made\nN 1.1\nAs set out in paragraph 7 of this Schedule\nN 0.5\n. . .\nPhosphorus Pentoxide (P2O5)\nAmount of phosphorus pentoxide soluble in mineral acids\nP2O5 1.1\nP2O5 0.5\nAmount of phosphorus pentoxide soluble in water\nAmount of phosphorus pentoxide soluble in mineral acids (after deduction of the amount of phosphorus pentoxide soluble in water)\nAmount of phosphorus pentoxide soluble in alkaline ammonium citrate\nAs set out in paragraph 7(a) of this Schedule\nN 1.5\n+P2O5 1.5\nNP fertiliser containing soft ground rock phosphate\nNP fertiliser containing partially solubilised rock phosphate\nProduct obtained chemically or by blending, 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) 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.\nThe 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.\nNitrogen (N)\n...\nFertiliser\n. . .\nAmount of total nitrogen\n. . .\nAmount of ureic nitrogen save that a declaration of 10% or less need not be made\nN 1.1\nAs set out in paragraph 7 of this Schedule\nN 0.5\n. . .\nPhosphorus Pentoxide (P2O5)\nAmount of phosphorus pentoxide soluble in mineral acids\nP2O5 1.1\nP2O5 0.5\nAmount of phosphorus pentoxide soluble in water\nAmount of phosphorus pentoxide soluble in neutral ammonium citrate and in water\nAmount of phosphorus pentoxide soluble only in mineral acids\nAs set out in paragraph 7(a) of this schedule\nN 1.5\n+P2O5 1.5\nNP fertiliser (Phosphate ingredient: aluminium-calcium phosphate only)\nProduct obtained chemically or by blending, 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 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 (Joule). 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.\nNitrogen (N)\n...\nFertiliser\n. . .\nAmount of total nitrogen\n. . .\nAmount of ureic nitrogen save that a declaration of 10% or less need not be made\nN 1.1\nAs set out in paragraph 7 of this Schedule\nN 0.5\n. . .\nPhosphorus Pentoxide (P2O5)\nAmount of phosphorus pentoxide soluble in mineral acids\nP2O5 1.1\nP2O5 0.5\nAmount of phosphorus pentoxide soluble in alkaline ammonium citrate\nAs set out in paragraph 7(a) of this schedule\nN 1.5\n+P2O5 1.5\nNP fertiliser (Phosphate ingredient: calcined phosphate only)\nProduct obtained chemically or by blending, 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 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.\nNitrogen (N)\n...\nFertiliser\n. . .\nAmount of total nitrogen\n. . .\nAmount of ureic nitrogen save that a declaration of 10% or less need not be made\nN 1.1\nAs set out in paragraph 7 of this Schedule\nN 0.5\n. . .\nPhosphorus Pentoxide (P2O5)\nAmount of phosphorus pentoxide soluble in alkaline ammonium citrate\nP2O5 1.1\nN 1.5\n+P2O5 1.5\nP2O5 0.5\nNP fertiliser (Phosphate ingredient: soft ground rock phosphate only)\nProduct obtained chemically or by blending, 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 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 anyh 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.\nNitrogen (N)\n...\nFertiliser\n. . .\nAmount of total nitrogen\n. . .\nAmount of ureic nitrogen save that a declaration of 10% or less need not be made\nN 1.1\nAs set out in paragraph 7 of this Schedule\nN 0.5\n. . .\nPhosphorus Pentoxide (P2O5)\nAmount of phosphorus pentoxide soluble in mineral acids\nP2O5 1.1\nP2O5 0.5\nAmount of phosphorus pentoxide soluble in 2% formic acid\nAs set out in paragraph 7(a) of this schedule\nN 1.5\n+P2O5 1.5\nNP fertiliser (Phosphate ingredient basic slag only)\nNP fertiliser (Phosphorus ingredient: Thomas phosphate only)\nNP fertiliser (Phosphate ingredient; Thomas slag only)\nProduct obtained chemically or by blending, 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 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.\nNitrogen (N)\n...\nFertiliser\n. . .\nAmount of total nitrogen\n. . .\nAmount of ureic nitrogen save that a declaration of 10% or less need not be made\nN 1.1\nAs set out in paragraph 7 of this Schedule\nN 0.5\n. . .\nPhosphorus Pentoxide (P2O5)\nAmount of phosphorus pentoxide soluble in 2% citric acid\nP2O5 1.1\nN 1.5\n+P2O5 1.5\nP2O5 0.5\nNP fertilisers containing crotonylidene diurea or isobutylidene diurea or urea formaldehyde (as appropriate)\nProduct obtained chemically without addition of organic nutrients of animal or vegetable origin and containing crotonylidene diurea or isobutylidene diurea or urea formaldehyde.\nContaining by weight:—\n1 not less than 5% nitrogen (N)\n2 not less than 5% phosphorus pentoxide (P2O5)\nThe sum of the two nutrients must be not less than 18% by weight.\nAt least 25% of the declared content of total nitrogen must derive from crotonylidene diurea,, or isobutylidene diurea or urea formaldehyde.\nAt least 60% of the declared nitrogen content from urea formaldehyde must be soluble in hot water.\nThe product must not contain Thomas slag, calcined phosphate, aluminium-calcium phosphate, partially solubilised natural phosphate or natural phosphate.\nThe P2O5 content soluble only in mineral acids must not exceed 2%\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, where appropriate, from\n1 crotonylidene diurea or\n2 isobutylidene diurea or\n3 urea formaldehyde;\nnitrogen from urea formaldehyde that is soluble only in hot water;\nnitrogen from urea formaldehyde that is soluble in cold water\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\n3\nNK fertiliser\nProduct obtained chemically or by blending, 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.\nNitrogen (N)\n...\nFertiliser\n. . .\nAmount of total nitrogen\n. . .\nAmount of ureic nitrogen save that a declaration of 10% or less need not be made\nN 1.1\nAs set out in paragraph 7 of this Schedule\nN 0.5\n. . .\nPotassium Oxide (K2O)\nAmount of potassium oxide soluble in water\nK2O 1.1\nN 1.5\n+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\nCl 0.2\nNK fertilisers containing crotonylidene diurea or isobutylidene diurea or urea formaldehyde (as appropriate)\nProduct obtained chemically without addition of organic nutrients of animal or vegetable origin and containing crotonylidene diurea or isobutylidene diurea or urea formaldehyde.\nContaining by weight:—\n1 not less than 5% nitrogen (N)\n2 not less than 5% potassium oxide (K2O)\nThe sum of the two nutrients must be not less than 18% by weight.\nAt least 25% of the declared content of total nitrogen must derive from crotonylidene diurea, or isobutylidene diurea or urea formaldehyde.\nAt least 60% of the declared nitrogen content from urea formaldehyde must be soluble in hot water\nNitrogen (N)\nAmount of:—\ntotal nitrogen;\namount where equal to or greater than 1% weight of:—\n1 nitric nitrogen\n2 ammoniacal nitrogen\n3 ureic nitrogen;\nnitrogen, where appropriate, from\n1 crotonylidene diurea or\n2 isobutylidene diurea or\n3 urea formaldehyde;\nnitrogen from urea formaldehyde that is soluble only in hot water;\nnitrogen from urea formaldehyde this is soluble in cold water.\nPotassium Oxide (K22O)\nPotassium oxide soluble in water. The indication ‘low in chlorine’ is linked to a maximum content of 2% chlorine (Cl). Chlorine content may be declared\n4\nPK fertiliser\nProduct obtained chemically or by blending, without addition of organic nutrient 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. 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.\nThe P2O5 content soluble only in mineral acids must not exceed 2%.\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\nP2O5 1.1\nP2O5 0.5\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\nP2O5 1.5\n+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\nCl 0.2\nPK fertiliser containing aluminium calcium phosphate\nProduct obtained chemically or by blending, without addition of organic nutrient of animal or vegetable origin, containing by weight:–\n1 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;\n2 Not less than 5% potassium oxide (K2O)\nThe 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 (Joule). 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.\nPhosphorus Pentoxide (P2O5)\nAmount of phosphorus pentoxide soluble in mineral acids\nAmount of phosphorus pentoxide soluble in water\nAmount of phosphorus pentoxide soluble in mineral acids (after deduction of the amount of phosphorus pentoxide soluble in water)\nAmount of phosphorus pentoxide soluble in alkaline ammonium citrate\nP2O5 1.1\nAs set out in paragraph 7(a) of this Schedule\nP2O5 0.5\nPotassium Oxide(K2O)\nAmount of potassium oxide soluble in water\nK2O 1.1\nP2O5 1.5\n+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\nCl 0.2\nPK fertiliser containing soft ground rock phosphate\nProduct obtained chemically or by blending, without addition of organic nutrient of animal or vegetable origin, containing by weight:–\n1 Not less than 5% phosphorus pentoxide (P2O5) of which at least 2% whould 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.\n2 Not less than 5% potassium oxide (K2O)\nPhosphorus Pentoxide (P2O5)\nAmount of phosphorus pentoxide soluble in mineral acids\nAmount of phosphorus pentoxide soluble in water\nAmount of phosphorus pentoxide soluble in neutral ammonium citrate and in water\nAmount of phosphorus pentoxide soluble only in mineral acids\nP2O5 1.1\nAs set out in paragraph 7(a) of this Schedule\nP2O5 0.5\nPK fertiliser containing partially sulubilised rock phosphate\nThe 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.\nPotassium Oxide(K2O)\nAmount of potassium oxide soluble in water\nK2O 1.1\nP2O5 1.5\n+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\nCl 0.2\nPK fertiliser (Phosphate ingredient; aluminium-calcium phosphate only)\nProduct obtained chemically or by blending, without addition of organic nutrient 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. At least 75% of the declared phosphorus pentoxide soluble in mineral acids must be soluble in alkaline ammonium citrate (Joule). 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.\nPhosphorus Pentoxide (P2O5)\nAmount of phosphorus pentoxide soluble in mineral acids\nAmount of phosphorus pentoxide soluble in alkaline ammonium citate\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\nAs set out in paragraph 7(a) of this Schedule\nK2O 1.1\nP2O5 1.5\n+K2O 1.5\nCl 0.2\nP2O5 0.5\nK2O 0.5\nPK fertiliser (Phosphate ingredient; calcined phosphate only)\nProduct obtained chemically or by blending, without addition of organic nutrient 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. 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 or 0.160 mm.\nPhosphorus Pentoxide (P2O5)\nAmount of phosphorus pentoxide soluble in alkaline ammonium citrate\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 (Phosphate ingredient: soft ground rock phosphate only)\nProduct obtained chemically or by blending, without addition of organic nutrient 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. 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.\nPhosphorus Pentoxide (P2O5)\nAmount of phosphorus pentoxide soluble in mineral acids\nAmount of phosphorus pentoxide soluble in 2% formic acid\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\nAs set out in paragraph 7(a) of this Schedule\nK2O 1.1\nP2O5 1.5\n+K2O 1.5\nCl 0.2\nP2O5 0.5\nK2O 0.5\nPK fertiliser (Phosphate ingredient: basic slag only)\nPK fertiliser (Phosphate ingredient: Thomas phosphate only)\nPK fertiliser (Phosphate ingredient: Thomas slag only)\nProduct obtained chemically or by blending, without addition of organic nutrient 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. 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.\nPhosphorus Pentoxide (P2O5)\nAmount of phosphorus pentoxide soluble in 2% citric acid\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\n5\nCompound fertiliser\nProduct 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), 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% each of these nutrients.\nAt least one of the nutrients must be derived from a material mentioned in the second column of Section A of this table.\nNitrogen(N)\nAmount of nitrogen\nAmount of ureic nitrogen save that a declaration of 10% or less need not be made\nPhosporus Pentoxide (P2O5)\nAmount of total phosphorus pentoxide\nAmount of phosphorus pentoxide soluble in water\nN. 0.5 (for declarations below 3.5% N)\n1.1 (for declarations 3.5% N and above)\nAs set out in paragraph 7(b) of this Schedule\nP2O5 (for declarations below 5,.5% P2P5)\n1.1 (for declarations 5,5% P2O5 and above)\nAs set out in paragraph 7(a) of this Schedule\n6\nCompound fertilisers not containing any material mentioned in the second column of Section A 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% each of these nutrients. None of the nutrients must be derived from a material mentioned in the second column of Section A of this table.\nPotassium Oxide (K2O)\nAmount of total potassium oxide\nK2 (for declarations bewlo 5.5% K2O)\n1.1 (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\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 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(12)(a)"
    },
    {
      "type": "F",
      "label": "F2",
      "text": "Word in Sch. 1 substituted (15.3.2019) by The Fertilisers and Ammonium Nitrate Material (Amendment) (EU Exit) Regulations 2019 (S.I. 2019/601), regs. 1(2), 2(12)(b)"
    },
    {
      "type": "F",
      "label": "F3",
      "text": "Words in Sch. 1 added (30.1.1995) by The Fertilisers (Amendment) Regulations 1995 (S.I. 1995/16), regs. 1(1), 4(b)(i), Sch. 2"
    },
    {
      "type": "F",
      "label": "F4",
      "text": "Words in Sch. 1 added (30.1.1995) by The Fertilisers (Amendment) Regulations 1995 (S.I. 1995/16), regs. 1(1), 4(b)(ii), Sch. 3"
    },
    {
      "type": "F",
      "label": "F5",
      "text": "Words in Sch. 1 added (30.1.1995) by The Fertilisers (Amendment) Regulations 1995 (S.I. 1995/16), regs. 1(1), 4(b)(iii), Sch. 4"
    },
    {
      "type": "footnote",
      "label": "f1",
      "text": "*As determined by the Petermann method."
    },
    {
      "type": "footnote",
      "label": "f2",
      "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/compound-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."
}