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Detail SNI
  1. SNI 02-2805-1992,Pupuk kalium klorida
  1. SNI 19-0428-1998 Petunjuk pengambilan contoh padatan
  1. Official Methods of Analysis AOAC International, 17 th Edition, Volume 1, 2000, Agricultural Chemicals, Contaminants, Drugs. Chapter 2 - Fertilizers
  2. ISO 5318, First Edition-1983-12-01, Fertilizers determination of potassium tetraphenyl borate, gravimetric method