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Fertilizers and soil conditioners -- Water soluble fertilizer -- General requirements by ISO is a reference work available to read on EtoBox.

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Foreword 0 1 Scope 0 2 Normative references 0 3 Requirement 0 4 Test method 0 4.1 Visual inspection for foreign matter 0 4.2 Determination of nitrogen, phosphorus and potassium contents 0 4.3 Determination of calcium, magnesium and sulphur contents 0 4.4 Determination of molybdenum, boron and manganese, zinc, copper and iron contents 0 4.5 Determination of the chelated fraction of micro-nutrients 0 4.6 Determination of the mass fraction of water insoluble matter 0 4.6.1 Principle 0 4.6.2 Reagents and materials 0 4.6.3 Apparatus 0 4.6.4 Ambient temperature controlled at (20 ± 10) °C 0 4.6.5 Test procedure 0 4.6.6 Calculation of the test result 0 4.6.7 Tolerance 0 4.7 Determination of the pH value 0 4.8 Determination of arsenic, cadmium, lead, chromium and mercury contents 0 4.9 Determination of biuret content 0 4.10 Determination of mass fraction of chloride 0 5 Sampling and preparation of test sample 0 5.1 Sampling method 0 5.1.1 Products in bags 0 5.1.2 Products in bulk 0 5.2 Reduction of samples 0 5.3 Test sample preparation 0 6 Marking and labelling 0 7 Package, transport and storage 0 Bibliography 0

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ISO

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EN

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reference