{
  "url": "https://openlegislation.uk/fertilisers-sampling-and-analysis-regulations-northern-ireland-1996/schedule-2/part-I/chapter-11./paragraph-8",
  "json_url": "https://openlegislation.uk/fertilisers-sampling-and-analysis-regulations-northern-ireland-1996/schedule-2/part-I/chapter-11./paragraph-8.json",
  "legislation": "nisr/1996/513",
  "legislation_title": "Fertilisers (Sampling and Analysis) Regulations (Northern Ireland) 1996",
  "legislation_url": "https://openlegislation.uk/fertilisers-sampling-and-analysis-regulations-northern-ireland-1996",
  "path": "schedule/2/part/I/chapter/11./paragraph/8",
  "kind": "paragraph",
  "number": "8",
  "heading": "EXPRESSION OF RESULTS",
  "text": "Method of calculation and formulae\n8.1 If the quantities and the dilutions shown in the Table are used, the following formulae apply:\n%K2Ointhefertiliser=(A-a)×f or\n%Kinthefertiliser=(A-a)×f' where:\nA = mass in grams of the precipitate from the sample\na = mass in grams of the precipitate from the blank\nf and f' = factors — see Table.\nWith samples and dilutions which differ from those of the Table use the following formulae:\n%K2O=(A-a)×F×D×100M\nor\n%K=(A-a)×F'×D×100M where:\nF = conversion factor, KTPB into K2O = 0.1314\nF' = conversion factor, KTPB into K = 0.109\nD = dilution factor\nM = mass in grams of the sample for analysis.\nTABLE FOR METHOD 11\n% of K2O in the fertiliser\n% of K in the fertiliser\nSample for analysis (g)\nAliquot portion to be taken as a sample for precipitation (ml)\nConversion factor f % K2O g KTPB\nConversion factor f' % K g KTPB\n1-5\n0.8-4.2\n20\n50\n13.14\n10.91\n5-10\n4.2-8.3\n10\n50\n26.28\n21.81\n10-20\n8.3-16.6\n10\n25\n52.56\n43.62\n20-50\n16.6-41.5\n10\n10\n131.40\n109.10\nmore than 50\nmore than 41.5\n5\n10\n262.80\n218.10",
  "extent": null,
  "status": null,
  "version": "current",
  "annotations": [],
  "outstanding_effects": [],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/nisr/1996/513/schedule/2/part/I/chapter/11./paragraph/8",
    "retrieved_at": "2026-10-29T02:32:40.012993+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."
}