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  1. ISO/TC 134 Düngemittel und Bodenverbesserungsmittel, ISO/TC 134 Fertilizers and soil conditioners, ISO/TC 134 Fertilisants, ISO Internationale Organisation für Normung, ISO International Organization for Standardization, ISO Organisation Internationale de Normalisation

    ISO 17319 : Fertilizers and soil conditioners - Determination of water-soluble potassium content - Potassium tetraphenylborate gravimetric method - [2015-05-00]

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    Geneve: International Organization for Standardization, 2015

    Published in: ISO-Regelwerk- ISO-Normen

  2. ISO/TC 134 Düngemittel und Bodenverbesserungsmittel, ISO/TC 134 Fertilizers and soil conditioners, ISO/TC 134 Fertilisants, ISO Internationale Organisation für Normung, ISO International Organization for Standardization, ISO Organisation Internationale de Normalisation

    ISO 7407 : Fertilizers; Determination of acid-soluble potassium content; Preparation of the test solution - [1983-05-00]

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    Geneve: International Organization for Standardization, 1983

    Published in: ISO-Regelwerk- ISO-Normen

  3. ISO/TC 134 Düngemittel und Bodenverbesserungsmittel, ISO/TC 134 Fertilizers and soil conditioners, ISO/TC 134 Fertilisants, ISO Internationale Organisation für Normung, ISO International Organization for Standardization, ISO Organisation Internationale de Normalisation

    ISO 5317 : Fertilizers; Determination of water-soluble potassium content; Preparation of the test solution - [1983-05-00]

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    Geneve: International Organization for Standardization, 1983

    Published in: ISO-Regelwerk- ISO-Normen